The objective was to evaluate the interactions between nitrogen-sulfur nutrients in the productive and nutritional development of wheat cv. BRS 394. Conducted in the field in a dystrophic Red Latosol, the combinations of nitrogen rates (0, 70, 140, 210 and 280 kg ha(-1)) and sulfur (0, 25, 50, 75 and 100 kg ha(-1)) were evaluated. 1). With treatments in randomized blocks and four replications, the plots consisted of 9 rows of 6.0 m spaced at 0.20 m. Yield variables, Nitrogen (N) and Crude Protein (CP) concentrations in the grains were evaluated. The data were subjected to analysis of variance and the means analyzed by means of polynomial regression at 5% by the F test. In 2017, the maximum productivity (3934.49 kg ha(-1)) occurred with the isolated effect of N (214.48 kg ha(-1)). In 2018, the maximum productivity (3888 kg ha(-1)) occurred with the use of 216 and 63 kg ha(-1) of N and S, respectively. For nitrogen and crude protein concentration in grains in 2017 and 2018, the effects were isolated for nitrogen doses, respectively. Nitrogen fertilization and its combination with sulfur provide gains in productivity, nitrogen concentration and crude protein in BRS 394 wheat grains.
Some Brazilian soils are naturally acidic, and the main way to correct this acidity is through the application of limestone, which provides calcium and magnesium to the soil. In recent years, there has been an increase in the use of alternative corrective agents, such as oxides, which are still not well-known and require further studies to assess their effectiveness in agricultural areas. The present study aimed to evaluate the performance of soybean and corn when subjected to a total or partial substitution of limestone with different oxides, analyzing productivity, plant height, foliar chlorophyll content, and soil chemical attributes. The experiment was conducted at the Invernadinha farm during the 2023/2024 harvest, starting on October 25, 2023, the day of soybean sowing. The experimental design was a randomized block design with seven treatments and four replications, totaling 28 experimental units. The treatments consisted of: 1. control, with no acidity corrective agents applied; 2. application of dolomitic limestone (4,378.92 kg ha(-1)); 3. application of calcium and magnesium oxide (7,882.05 kg ha(-1)); 4. calcium oxide (4,777 kg ha(-1)); 5. calcium oxide enriched with sulfur (3,153.9 kg ha(-1)); 6. dolomitic limestone (2,314.12 kg ha(-1)) and calcium oxide enriched with sulfur (3,622.1 kg ha-1); 7. calcium and magnesium oxide (4,165.42 kg ha(-1)) and calcium oxide enriched with sulfur (3,622.1 kg ha(-1)). The different acidity correction treatments did not influence the productivity of the crops. However, sulfur increased its levels in the 0 to 0.2 m and 0.2 to 0.4 m soil layers in the treatments where calcium oxide with sulfur was used or mixed with other acidity corrective agents. The SPAD index of chlorophyll B and total chlorophyll was affected by the different soil acidity management practices.
Wheat productivity and quality can be influenced by plant nutrition, and the interaction between nutrients can be synergistic or antagonistic, especially in the interaction between nitrogen and sulfur. The objective of this study was to verify the effect of the interaction between nitrogen and sulfur on the agronomic performance and technological quality of irrigated wheat in Cerrado conditions. The experiment was installed in an experimental area at the Federal University of Rondon & oacute;polis. The experimental design was in randomized blocks, with four replications. four repetitions. The nitrogen (N) doses tested were 0, 70, 140, 210 and 280 kg ha(-1), and the sulfur (S) doses were 0, 25, 50, 75 and 100 kg ha(-1), totaling 13 treatments across the combinations between the 2 nutrients. The variables analyzed referred to the agronomic performance and technological quality of the grains. The response surface model and terms (linear, quadratic and interaction) were evaluated using analysis of variance (ANOVA) and checking for lack of fit (Lack of fit), using the F test (p<0.05). In cases where the response surface model selection criteria were not met, the isolated effects and interaction of factors were analyzed using polynomial regression analysis. For the significance of the effects, the ANOVA F test (p<0.05) and the Student's t test (p<0.05) were considered. The agronomic performance and technological quality of irrigated wheat grown under Cerrado conditions are influenced by nitrogen doses between 176 and 280 kg ha(-1) and sulfur between 38 and 100 kg ha(-1).
This article discusses the interrelationship between quality education (SDG 4), climate justice, and the formation of ecological citizenship, taking the Amazonian reality as a reference. It is a theoretical-reflective study, guided by a literature review, which seeks to consolidate a critical view of contemporary debates involving education, sustainability, and the climate crisis. It starts from the concept of critical environmental education, understood as an emancipatory practice capable of enabling individuals to understand and face the challenges imposed by current environmental and social transformations. The text articulates theoretical and practical foundations that connect educational quality, sustainability, and environmental justice, highlighting the role of the school as a space for comprehensive education and student leadership. It argues that, especially in Amazonian contexts, education should promote dialogue between different types of knowledge, the development of ecological awareness, and transformative action aimed at building more just and sustainable societies.
Given the growing demand and importance of corn, achieving the crop's maximum production potential is crucial. This study aimed to evaluate the productivity of a simple corn hybrid in response to different nitrogen (N) and potassium (K) rates in the Southern Cone of Rondonia. Treatments consisted of five topdressing rates of N and K (0, 50, 100, 200, and 400 kg ha(-1)). Plant growth characteristics responded to nitrogen fertilization. Significant differences were observed only for N rates in yield components. The maximum agronomically efficient rate found was 266 kg of N, achieving a productivity of 11,445.78 kg ha(-1). The interaction of increasing N and K rates negatively affected the foliar contents of Ca, Mg, and B.
