Land degradation alters soil properties, although it is not always clear whether these changes affect soil classification. The objective of this study was to evaluate the effect of agricultural and forest land use on soil classification in the terraces of Huimanguillo, Tabasco. Four land uses were examined: rubber plantation (Hevea brasiliensis), pasture (Brachiaria humidicola), lime cultivation (Citrus latifolia), and secondary vegetation, all located under similar conditions of topography, parent material, time, and climate. In each land use, four soil profiles were described and samples were collected by horizon. Physical and chemical properties were determined in accordance with NOM-021-RECNAT-2000, and soil classification was performed using the WRB 2022 system. ANOVAs and Tukey tests (p < 0.05) were applied to assess differences in the A horizon. The soils were classified as Umbrisols (12 sites) and Lixisols (4 sites). Umbrisols exhibited the principal qualifiers Acric and Lixic, and the supplementary qualifiers Humic, Ferralic, Eutric, and Chromic. Lixisols showed the principal qualifiers Chromic and Ferralic, and the supplementary qualifiers Cutanic, Differentic, and Humic. The A horizon of Umbrisols displayed greater thickness, porosity, organic matter content, and cation exchange capacity, whereas Lixisols showed higher chroma, bulk density, and sodium content. These differences are attributed to vegetation cover and the presence of tree vegetation older than 20 years, which favors the conservation of Umbrisols, while cultivation practices involving the removal of herbaceous vegetation have induced physical and chemical degradation in Lixisols. Land-use change has affected soil classification at the group level.

Introduction. Brosimum alicastrum Swartz, a tree species with potential for both animal and human consumption, grows naturally with no silvicultural management. Objective. To determine which asexual propagation technique (air layering or grafting) produces the best-quality nursery individuals, to evaluate its viability in a plantation. Materials and methods. Completely randomized experimental designs were developed to evaluate air layering (factorial arrangement: substrate [coconut fiber, peat moss, and forest soil] and rooting hormone [Radix 10000 (R) and no rooting hormone]) and grafting techniques (budding, side veneer, whip and tongue, and crown grafting). Subsequently, 10 individuals from each air layering and grafting treatment were randomly selected for plantation establishment. Survival and tree-measurement characteristics were evaluated for each treatment. Results and discussion. The growth of air-layered clones was more significant with peat moss and forest soil substrates (P = 0.05); the rooting hormone had no significant effect. Bud grafting was not viable; success rates ranged from 65 % to 80 % with the other techniques. Some air layering and grafting treatments performed well in the nursery, but their individuals did not survive after transplanting them to the field. Air-layered clones using forest soil as a substrate showed the highest growth rates, as well as the greatest percentages of flowering (70 %) and fruit production (50 %) in the plantation. Conclusions. Air-layered clones using forest soil and grafts using whip and tongue or crown grafting had the best characteristics in the plantation. The propagation method should be selected based on the intended final use of the germplasm (seed, leaf, or wood).

Objective: To know the effect of controlled release fertilizers on the growth and development components of Tabebuia rosea (Bertol.) Design/methodology/approach: In this research, a randomized block design with seven treatments and 50 replications was used. Three treatments will consist of substrate with different mixtures of Controlled Release Fertilizers (CRF) at three concentrations each of 4, 5 and 6 kg m-3 plus a Control (without fertilization). Results: The use of controlled release fertilizers such as Multicote™ Agri 8 and Basacote® Plus 9M demonstrated greater growth and development in macuilis seedlings on the components of plant height, basal stem diameter, aerial biomass, root biomass among others, of the seven treatments presented in this research, the concentrations at 5 and 6 kg m-3 proved to be the best nutritional alternative, which will result in a higher survival rate in the field. Limitations on study/implications: Due to the loss of undisturbed specimens, it is becoming increasingly difficult to find trees with seed production capabilities. Findings/conclusions: Multicote™ Agri 8 in concentrations of 5 and 6 kg m-3 is the best nutritional alternative for optimal growth and development. As far as I know, it is essential for reforestation in urban and rural areas of the region. In addition, for its floral beauty that is part of the culture of the state. Keywords: Macuilis, Growth, Development, Quality Indices.

Introducción. Brosimum alicastrum Swartz, especie arbórea con potencial para la alimentación animal y humana, se distribuye de manera natural con nulo manejo silvícola. Objetivo. Determinar que técnica asexual (acodo o injerto) produce los mejores individuos en vivero, para evaluar su viabilidad en una plantación. Materiales y métodos. Se desarrollaron diseños experimentales completamente al azar para evaluar la propagación de acodos (arreglo factorial: sustrato [fibra de coco, peat moss y tierra de monte] y enraizador [Radix 10000® y sin enraizador]) e injertos (yema, chapado lateral, inglés y corona). Posteriormente, se seleccionaron 10 ejemplares al azar de los tratamientos de acodos e injertos, para su establecimiento en una plantación. Se evaluó la sobrevivencia y los parámetros dasométricos en cada tratamiento. Resultados y discusión. El crecimiento de los clones de acodos fue mayor con los sustratos peat moss y tierra de monte (P = 0.05); el enraizador no tuvo efecto significativo. El injerto en yema no fue viable; los prendimientos variaron de 65 a 80 % con las otras técnicas de injerto. Algunos tratamientos de acodo e injerto tuvieron buenos resultados en vivero, pero sus ejemplares no sobrevivieron en la plantación. Los clones de acodos con tierra de monte como sustrato tuvieron los mayores crecimientos y porcentajes de floración (70 %) y producción de frutos (50 %) en la plantación. Conclusiones. Los clones de acodo con tierra de monte y los injertos (inglés y corona) presentaron las mejores características en la plantación. El método de propagación se debe seleccionar con base en el uso final del germoplasma (semilla, hoja o madera).

This study aimed to evaluate the physiological responses and yield of Tahiti lime (Citrus latifolia) cultivated at high density under three soil moisture tension (SMT) levels: low (L = −0.010 MPa), medium (M = −0.035 MPa), and high (H = −0.085 MPa). Measurements included water status, sap flow, photochemical activity, gas exchange, and fruit yield during the dry and early rainy seasons. The leaf water potential (ΨL) and relative water content (RWC) were higher in the L and M treatments than in H, with an overall improvement at the onset of the rainy season. From the dry to the rainy season, sap flow decreased by 25.3, 16.0, and 1.9 L day−1 in L, M, and H plants, respectively. Plants with higher soil water availability (L and M) maintained better water status during the dry season, which favored photochemistry and gas exchange, reflected in a greater shoot growth and fruit yield (54.5 and 53.4 kg plant−1, respectively). In contrast, H SMT significantly reduced water relations and photosynthetic activity, leading to yield loss. Short-term rainfall (six days) was insufficient to restore physiological performance. Maintaining SMT around −0.035 MPa during the dry season optimizes yield while reducing water use.

Background: The large amount of native maize available in Mexico can be used in different associations with other crops, such as squash. However, it is necessary to determine whether its productivity is adequate and whether maize germplasm has an influence on it. Objective: To evaluate the yield of different native maize germplasms in monoculture and in intercropping with squash and to determine the most productive system using the Land Equivalent Ratio (LER). Methodology: In 2022, three maize landraces from the Yucatan Peninsula, a commercial hybrid as a control, and a local squash species were studied in Keste, Campeche, Mexico. With the data, Pearson's correlation, analysis of variance, Tukey's multiple mean comparison test (α = 0.05), and LER were determined. Results: Maize in monoculture yielded significantly higher (2.35 t ha-1) than in the intercropping system. Nal Xoy and X'mejenal Nal maize landraces had the highest yields, although the hybrid exceeded them. The yield of squash seeds was statistically the same in monoculture and intercropping. In the association of native maize and squash, the type of maize germplasm has a direct impact on yield. The Land Equivalent Ratio (LER) confirmed the different levels of productivity in the two systems and the effects of maize germplasm. Implications: A relationship exists between the production system, maize germplasm, and yield. Conclusion: Maize yield is higher in monoculture than in the intercropping system. The LER could be a helpful coefficient to choose the right maize landrace to be planted in intercropped systems. The identified LER coefficients of 1.6–1.9 indicate that intercropping systems utilise land area more efficiently than monoculture systems.

Objective: To evaluate the effect of the application of commercial sargas-sum extract as a foliar biofertilizer in sugarcane cultivation.Design/methodology/approach: Five fertilization treatments were applied in an experimental plot cultivated with sugarcane: Conventional mineral fer-tilization (T1); Foliar fertilization with 100% sargassum extract (T2); Foliar fertilization with 50% sargassum extract (T3); Conventional 50% mineral fertilization plus foliar fertilization with 50% sargassum extract (T4), and control without fertilization (T5), in a completely randomized experimental design.Results: The highest stem height was observed in the statistically equal T1, T2 and T4 treatments, but higher than that of the control. The larger diam-eter was observed in the T4 treatment, significantly larger than that of the control, in which a statistically lower number of leaves was also observed. The highest field yield was observed in statistically identical T1, T2 and T4 treatments, but superior to that of the control.Limitations on study/implications: Further evaluation of commercial ex-tracts of sargassum applied as foliar fertilizers in crops is considered nec-essary to corroborate the results presented here. A study of the mechanisms of action of the compounds present in sargassum extract on crop physiology, when applied as foliar fertilizers, is also considered necessary.Findings/conclusions: Commercial sargassum extract is a sustainable alternative to sugarcane biofertilization, which does not pose a risk of chemical contamination like that of conventional mineral fertilization.

A pesar de todo el conocimiento generado en torno a las técnicas de injerto en especies vegetales, existe poca investigación que evalúe los resultados encontrados. El objetivo de este trabajo fue analizar, mediante técnicas bibliométricas, la información publicada en artículos científicos donde se evalúo alguna técnica de injerto, para identificar metodologías de análisis, tipos de injertos, especies vegetales y la aplicación de los resultados encontrados. La palabra clave utilizada para la búsqueda de los artículos cientificos fue ‘grafting’, y se consideraron publicaciones hasta diciembre de 2022. De 1994 a 2022 se identificaron 293 artículos científicos, la frecuencia de su publicación mostró una tendencia exponencial (R2 0,54). Se encontró que se evalúan variables asociadas al portainjerto, injerto y sobrevivencia de la nueva planta formada, que son evaluadas cada vez con mayor frecuencia con técnicas multivariadas por el interés de detectar las variables más significativas a partir de un número elevado de variables analizadas. Se documentaron 11 técnicas de injerto: púa, hendidura, empalme, inglés, yema, in vitro, microinjerto, en T, chapado, chip y entube. Las especies de mayor análisis correspondieron a frutícolas (cítricos), hortícolas (tomate), forestal (nogal), y ornato (rosa). Sin embargo, el 63,47 de los artículos científicos se limitaron a hacer análisis descriptivos sobre prendimiento, compatibilidad y sobrevivencia de los materiales vegetativos. Lo anterior, deja un área de oportunidad para desarrollar investigación sobre los procesos de mejora genética en la búsqueda de caracteres agronómicos de interés (fruto y crecimiento), o bien en la diversidad genética orientada a la productividad y/o conservación.

Mahogany and cedar are native species of tropical America and are considered the most valuable tropical hardwoods in the world. Therefore, forest plantations have been established on a commercial scale, giving them a sustainable silvicultural management, being fertilization one of the most important practices. The objective of this work was to evaluate the effect of four doses of fertilization on the growth of early-stage mahogany and cedar in an acid savanna soil, as well as to determine the NPK nutrient demand of each species. Eight fertilization treatments were tested on the two species. The variables studied were total height and stem diameter, and measurements were taken during 10 months. To estimate nutrient demand, four complete trees were sampled and NPK concentration was determined in each tissue (leaf, stem and root). The results show that cedar presented greater growth in height and diameter. In the height variable in the cedar species, it was the one that showed significant statistical differences, being the treatment 17-17-60 with the amounts of 35 and 50 g with an increase of 177 cm. The amount of NPK nutrient demanded by both species presented a relationship in the following order N>K>P. The greatest extraction of N, P and K is carried out by the stem and to a lesser extent by the root. And in the case of the highest concentration of nutrient is found in the leaves. Cedar showed higher nutrient demand and better exploration of the rhizosphere tan mahogany.

Objective: To evaluate the effect of the incorporation of Crotalaria juncea L. as green manure on the weed community in a cassava crop in Tabasco. Design/methodology/approach: The study was carried out in the Experimental Field of Colegio de Postgraduados, Campus Tabasco (18º01' N and 93º03' W). The samplings were made on four dates: 1) at the planting of crotalaria (12/03/2018); 2) at flowering (31/01/2019); 3) 20 days after incorporation (22/02/2019); 4) at cassava harvest (25/04/2019), using metal squares 50 x 50 cm. Two planting densities, 50 and 80 cm (16,600 and 10,375 plants ha-1), two doses of NPK fertilization (160-40-80 and 00-40-80+GM), and a control were tested. The name of the species, number of individuals and coverage (percentage) were recorded to calculate the richness (S), Shannon diversity (H') and uniformity (E) indices, and the importance value index (IVI). Results: The weed community consisted of 32 species, 28 genera and 16 families, of which the best represented are: Convolvulaceae, Asteraceae, Cyperaceae and Poaceae. The most frequently recorded species are Lindernia crustacea, Ludwigia octovalvis, and Ageratum houstonianum. The diversity indices reflected a poor community, especially with GM treatments; diversity ranged from low to medium and uniformity from medium to high. The importance of the families was more related to the environmental conditions than to the treatments; Cyperaceae were more important in the rainy season and Asteraceae in the dry season. L. crustacea appeared throughout the cycle. Limitations/implications: It is advisable to extend the investigation period. Findings/conclusions: The weed flora consisted of 32 species; the Convolvulaceae family was the most diverse and L. crustacea was the most recorded species during the cycle. The diversity indices reflected a poor community. The importance of the families was related to environmental conditions, where Cyperaceae stood out in the rainy season and Asteraceae in the dry season

Background: Anthropogenic increases in water consumption and changes in precipitation patterns caused by climate change make it imperative to optimize water use, particularly in the agricultural sector in which most large proportion of fresh water is used. Objective: To evaluate the effect of irrigation, applied when soil water moisture tensión (SWMT) has reached levels -15, -30, -45 and -60 kPa, on growth, yield, water use efficiency and water footprint in cucumber production, in “La Chontalpa”, Tabasco. Methodology: The experiment was carried out under a randomized complete block experimental design with four repetitions. The variables evaluated were: length of the main guide (LGP; cm), diameter of the main guide (DGP; mm), number of leaves per plant (NH), number of female flowers (NFF), number of male flowers (NFM), number of total flowers (NFT), ratio of male flowers/female flowers (FM/FF), number of fruits per plant (NFP), fruit length (LF; cm), fruit diameter (DF; cm) , fruit weight (PF; g), fruit weight per plant (PFP; kg plant-1) and fruit yield per hectare (RF; t ha-1). Irrigation water use efficiency (EUAr; t ha-1 mm-1), total water use efficiency (EUAT; t ha-1 mm-1), and water footprint (HH) were also evaluated (m3 t-1). Results: In all variables related to cucumber growth and yield, statistically equal values were found in the -15 kPa and -30 kPa treatments, with significantly lower values in the -60 kPa SWMT (Tukey; α = 0.05). The highest EUAr and the lowest HH were observed in the SWMT of -30 kPa, significantly different from the rest of the treatments. Implications: The results show that the application of irrigation in the crop, based on SWMT measurements, allows improving agricultural water management, reducing HH. Conclusions: The value of SWMT at the time of irrigation has a significant effect on growth and yield variables, as well as on sustainability indicators in irrigation water management.

Objective: This study aims to describe the approach of agricultural simulation models and their potentialapplication in sugarcane crops in various regions of Mexico.Methodology: A comprehensive review and classification of scientific articles indexed in major databases, suchas SCOPUS or ELSEVIER, was conducted. The focus was on articles related to agricultural and sugarcanesimulation models.Results: A collection of scientific articles concerning agricultural simulation models for sugarcane crops wasanalyzed. A detailed description of the models’ approaches and application for this crop, along with theirpotential use in certain regions of Mexico was developed.Study Limitations: The literature of the application of agricultural simulation models for sugarcane inMexico in recent years is limited.Conclusions: Crop simulation models are recognized and widely used as indispensable tools in agriculturalresearch. It is crucial to note that many of the models rely on climate information to produce accurate results.Therefore, obtaining reliable and accurate data is essential to achieve trustworthy and useful results applicableto the relevant agricultural areas.

La caoba y el cedro son especies nativas de América Tropical y se consideran maderas preciosas tropicales más valiosas del mundo. Por lo que se han establecido plantaciones forestales a escala comercial, dándole un manejo silvícola sustentable, siendo la fertilización una de las prácticas más importantes. El objetivo de este trabajo fue evaluar el efecto de cuatro dosis de fertilización sobre el crecimiento de caoba y cedro en fase temprana en un suelo ácido de sabana, así como determinar la demanda nutrimental de NPK de cada especie. En el experimento se probaron ocho tratamientos de fertilización en las dos especies. Las variables estudiadas fueron altura total y diámetro del tallo, realizándose mediciones durante 10 meses. Para estimar la demanda nutrimental, se muestrearon cuatro árboles completos; y se determinó su concentración NPK en cada tejido (hoja, tallo y raíz). Los resultados muestran que el cedro presentó mayor crecimiento en altura y diámetro. La variable altura en la especie cedro, fue la que mostró diferencias estadísticas significativas, siendo el tratamiento 17-17-60 con las cantidades de 35 y 50 g con un incremento de 177 cm. La cantidad de nutriente de NPK que demandan ambas especies presentan una relación en el orden siguiente N>K>P. La mayor extracción de N, P y K la realiza el tallo y en menor cantidad la raíz. Y en el caso de la mayor concentración de nutriente se encuentra en las hojas. El cedro mostró mayor demanda nutrimental y mejor exploración de la rizósfera que la caoba.

Despite all the knowledge generated about grafting techniques in plant species, there is little research that evaluates the results found. The objective of this work was to analyze, through bibliometric techniques, the information published in scientific articles in which a grafting technique was evaluated, to identify analysis methodologies, types of grafts, plant species, and application of the results found. The keyword used for the search of scientific articles was 'grafting', and publications up to December 2022 were considered. From 1994 to 2022, 293 scientific articles were identified, the frequency of their publication showed an exponential trend (R-2 = 0,54). It was found that variables associated with rootstock, graft and survival of the newly formed plant are evaluated, with an increasing use of multivariate techniques in order to detect the most significant variables. Eleven grafting techniques were documented: bark grafting, cleft grafting, splice grafting, whip tongue grafting, budding, in vitro grafting, micrografting, T-budding, side-veneer grafting, chip budding, and tube grafting. Fruit (citrus), horticultural (tomato), forest (walnut), and ornamental (rose) crops were the most widely analyzed. However, 63,47% of the scientific articles were limited to descriptive analyses on success rate, compatibility and survival rate of vegetative materials. This provides the opportunity to conduct research on genetic improvement processes in the search agronomic traits of interest (fruit and growth), or on genetic diversity aimed to improve productivity and/or conservation.

Background: Anthropogenic increases in water consumption and changes in precipitation patterns caused by climate change make it imperative to optimize water use, particularly in the agricultural sector in which most large proportion of fresh water is used. Objective: To evaluate the effect of irrigation, applied when soil water moisture tensión (SWMT) has reached levels -15, -30, -45 and -60 kPa, on growth, yield, water use efficiency and water footprint in cucumber production, in “La Chontalpa”, Tabasco. Methodology: The experiment was carried out under a randomized complete block experimental design with four repetitions. The variables evaluated were: length of the main guide (LGP; cm), diameter of the main guide (DGP; mm), number of leaves per plant (NH), number of female flowers (NFF), number of male flowers (NFM), number of total flowers (NFT), ratio of male flowers/female flowers (FM/FF), number of fruits per plant (NFP), fruit length (LF; cm), fruit diameter (DF; cm) , fruit weight (PF; g), fruit weight per plant (PFP; kg plant-1) and fruit yield per hectare (RF; t ha-1). Irrigation water use efficiency (EUAr; t ha-1 mm-1), total water use efficiency (EUAT; t ha-1 mm-1), and water footprint (HH) were also evaluated (m3 t-1). Results: In all variables related to cucumber growth and yield, statistically equal values were found in the -15 kPa and -30 kPa treatments, with significantly lower values in the -60 kPa SWMT (Tukey; α = 0.05). The highest EUAr and the lowest HH were observed in the SWMT of -30 kPa, significantly different from the rest of the treatments. Implications: The results show that the application of irrigation in the crop, based on SWMT measurements, allows improving agricultural water management, reducing HH. Conclusions: The value of SWMT at the time of irrigation has a significant effect on growth and yield variables, as well as on sustainability indicators in irrigation water management.

The "Chihua" squash (Cucurbita argyrosperma Huber) is used to obtain "pepita" seeds, which are important in the preparation of dishes, sweets, snacks and oils. In Campeche, Mexico, it is the fourth crop in planted area, however, there are no improved varieties. Producers use their own seed, so they have low yields and pest and disease problems, among others. Currently, an improved variety is being developed in a participatory manner with producers for the region, to increase yield and improve biotic and abiotic stress. The progress in the variety breeding is presented.

Objective: To evaluate the quality of a Cambisol at different times of agricultural use in the Los Ríos region (RR), Tabasco, Mexico. Design/Methodology/Approach: Four agricultural uses were selected on a Cambisol (CM): rainfed crop (RC), annual crop (AC), pasture (Pa), and secondary vegetation (SV). These were established at three different times (1984, 2000, and 2019) with four replications. Soil was collected using an auger at a depth of 0-30 cm. The physicochemical properties of the soil—such as texture (T), bulk density (BD), aggregate stability (AS), pH, electrical conductivity (EC), organic matter (OM), total nitrogen (N), phosphorus (P), and potassium (K)—were determined. A factorial analysis of variance was performed (significance level p=0.05). Variables that showed a statistically significant effect were subjected to Tukey's multiple comparison test (significance level p=0.05). Results: Statistically significant differences (p≤0.05) were obtained for OM, P, K, and BD contents. The high OM content present in CM with SV in all years shows a better soil quality compared to CM with RC and AC. The high BD recorded in CM with Pa since 1984 shows soil quality degradation by compaction resulting from grazing due to extensive livestock farming. Study limitations/Implications: Sustainable management practices are required to recover degraded CM. Findings/Conclusions: OM and BD contents were the best quality indicators for the CM affected by the change in agricultural use and time of use in RR, Tabasco.

El objetivo fue analizar la evolución espacio-temporal de la producción de artículos científicos que utilizaron alguna metodología para la estimación de la evapotranspiración potencial en un cultivo agrícola (ETP). Se recopilaron 475 artículos científicos disponibles en la Web of Science. Los modelos para estimar la ETP de mayor frecuencia fueron los propuestos por FAO-Penman-Monteith (31.79%), Pemnan-Monteith (26.11%), y Thornthwaite (11.37%), y se aplicaron principalmente a cultivos de maíz, sorgo, soya y papa, en países como Estados Unidos, China, Brasil, e India, lideres agrícolas a nivel mundial. Se encontró que ocurrió un crecimiento exponencial en la publicación de los textos de 1984 a 2020 (R2 = 0.7624), lo que denota la relevancia del tema como un mecanismo para eficientizar el agua.

In the state of Veracruz, Mexico, low sugarcane yields are reported despite the high use of inputs. This results in economic losses and environmental pollution. A fertigation system designed at the Colegio de Postgraduados (COLPOS) Campus Veracruz was established to determine the uniformity and stability of fertilizer distribution in the sugarcane crop. This study was carried out in a sugarcane plot with a farmer participant. Three levels of valve openings at the injector inlet (1/3, 2/3, and 3/3) were tested to determine the homogeneity of fertigation at the outlet of the gates and the stability of the system over time. Samples of water-fertilizer mixture were taken at the outlet of the gates. They were analyzed in the laboratory with a UV-visible spectrophotometer at 202 nm for nitrogen. It was found that the 1/3 and 3/3 valve position openings caused instability in the system. For the 2/3 opening with p = 0.359, no statistical difference (α= 0.05) was found during the time of emptying the container of the water-fertilizer mixture. Therefore, the fertigation system proved to be stable with a valve opening close to 2/3. Using the valve openings, the flow rate of water-fertilizer entering the system is uniformly mixed at the outlets of the multi-gate pipeline that pours into the crop furrows (p = 0.474 and α = 0.05). It can be concluded that in fertilization using a low-pressure irrigation system, nitrogen fertilizer is uniformly distributed when a Venturi type injector is used in a sugarcane agroecosystem with a valve opening close to 2/3.

The acacia (Acacia mangium Wiild.) generates a large amount of aerial biomass, part of it, the litter, constitutes an important source of nutrients that are extracted from the depth of the soil by the root biomass, responsible for supporting the plant, absorption of nutrients and water. Based on the above, the objective of this research was to evaluate the edaphic fertility at the beginning, at 6 and 42 months of age of the acacia and the behavior of the vertical distribution of fine roots (DLRF) in a sugarcane soil converted to agroecosystem A. mangium at 6, 12, 18, 24, 30, 36 and 42 months of age, with two fertilization treatments. The nutritional diagnosis of the soil at the beginning showed favorable characteristics for the optimal development of the acacia, mostly medium contents. The nutrients Nt, P, K, Ca, Mg, had a statistically significant increase as age increased. The DLRF tended to be higher at 0-20 and 20-40 cm, in recent months it reached 2.0 km m(-3), similar to that reported in other studies in the region, however, there was no statistically significant difference in its increase. due to fertilization effect, except at 42 months. Acacia shows a high potential to increase soil fertility and generates an important DLRF for nutrient uptake.