【Objective】In order to provide appropriate irrigation reference basis for the planting of Scindapsus aureus and reduce the waste of water resources in agricultural production, the relationship between the growth of S. aureus and water stress was explored.【Methods】S. aureus was selected as the experimental material and treated with different gradients of water stress in four groups. The CI-600 plant root growth monitoring equipment was used to collect and analyse the relationship between root number, root length, root area, root volume and the water stress, respectively, and the Excel software was used to process data then draw the relation curve between relevant root parameters and soil water stress. The relationship between plant root growth and water stress was finally obtained by using the least square method and quadratic term fitting method for model fitting.【Result】Most of the models fitted by quadratic terms have R2 greater than 0.9, which indicates a high degree of fitting. The root number, root area and root volume are growing the fastest under the humidity of 35%. Humidity in the range of 25%-35% is conducive to the increase of root length. According to the fitting curves, the two indexes of root number and root length are consistent under 25% and 35% humidity conditions. Moreover, water stress affects root area and root volume by affecting root length and root number. Roots also depend on the expansion of diameter to obtain effective absorption area while elongating. The change of root volume is related to the changes of root number and root diameter.【Conclusion】In conclusion, the optimum growth humidity for S. aureus is 35%. What's more, drought stress(15%)and flooding stress(45%)have adverse effects on root growth. Finally, under different water stress, the physiological indexes of root system have different trends and behaviors, and the indexes are interrelated and complementary to each other so as to form a harmonious growth system. Therefore, when cultivating plants, humidity should be controlled in the appropriate range to obtain the high quality biological characteristic values of the plants, then to ensure its economic benefits.

为探究在不同生境条件下农作物的长势,明确并创造农作物的最佳生长条件,本文设计了一套精细监管下的作物长势与生境信息监测系统,对农作物所处生境与作物长势等信息进行探究.系统利用机器视觉、物联网等技术,完成了作物病虫害识别与生境信息监测等功能,有助于农作物的增产增收.

[目的]研究茶树根系的生长规律.[方法]设计了基于CI-600的茶树根系生长监测试验,采用微根管法监测茶树根系形态的生长数据,花花草草监测仪检测土壤水分,希玛手持式温湿度计记录环境温度,并结合Office Excel和SPSS 25.0进行数据分析,寻找茶树根系生长的最佳土壤水分含量和环境温度条件.[结果]茶树的根数量、根长度、根面积和根体积均与15％～35％的土壤水分存在高度正相关关系.茶树的根数量、根长度、根面积和根体积增长最有利的环境温度在20～27℃.当环境温度在一定范围时,茶树的根数量、根长度、根面积、根体积与环境温度均呈显著正相关.当环境温度在一定范围时,茶树的根数量、根长度、根面积、根体积与环境温度建立的线性回归模型的拟合度均很好,有明显的因果关系.[结论]该研究为茶树的温室培育环境设计提供一定的数据支撑和理论基础.

为解决山地农业运输运量大、道路条件差、人力运输劳动强度大等问题,设计了一种适合丘陵山区果园使用的单轨运输设备.该设备以汽油机作为动力,采用自走式行走方式,运输装备能装载350 kg左右的货物,行走速度约为0.7 m/s,最大可以在坡度45°左右的陡坡单轨上安全行驶.试验表明,该单轨运输设备可适用于丘陵山区果园运送果实、肥料和农机具等,也可配备喷雾装置或相应监测设备等进行作业.

风送式喷雾机的性能决定了农药喷洒的均匀性、附着率及利用率,风筒出口风速和压力是衡量风送式喷雾机性能的主要指标,而导流片弯曲程度等参数直接影响风筒的内部流场产生,进而影响风筒出口风速和压力.为优化风送式喷雾机的综合性能,研究不同结构导流片对其的影响,本文使用Fluent软件进行仿真分析,建立了无导流片和7种弯曲程度不同的导流片模型,分析不同导流片对风筒内部压力与速度的影响,得到性能最优的组合模型.仿真结果表明,当风扇转速为2926.5 r/min时,与直导流片相比,弯曲导流片能降低风筒内部的压力损失,以圆心角为30°构建的导流片均比以圆心角为63.4°构建的导流片的压力损失小,其中半径为9 cm、圆心角为30°的导流片最小,不同弯曲程度的导流片在风速上相差不大.