棉花膜下滴灌土壤水势的动态监测

试验采用TS型压阻式土壤水势传感器测量0 ～20 cm和20～40 cm不同深度范围的土壤水势值,通过四通道土壤水势变送器把数据信号传输到上位机,在上位机接收到信号之后,通过系统动态监测软件分析出土壤水势的变化.根据北疆灌溉的实际情况,压阻式土壤水势传感器布置在0～20 cm和20～40 cm两个土层.此外,同时标定出棉田土壤0～20 cm和2 0～ 40 cm的土壤水分特征曲线,通过土壤水分特征曲线方程把动态监测到的不同深度土壤水势值转化为土壤相对含水量,来指导实践生产中的灌溉.

Dynamic Monitoring of Soil Water Potential under Cotton Membrane Drip Irrigation

TS piezoresistive sensors were used in the experiment to measure soil water potential of the different soil depth ranges of 0～20cm and 20～40 cm;the data signal was sent to the computer by 4-channel potential transmitter.After the data signal is accepted by the computer,dynamic monitor of soil water potential will be successfully realized by the monitor system software.According to irrigation situation in the north of Xinjiang at present,piezoresistive sensors are arranged at the soil depth of 20 cm and 40 cm.At the same time,the soil moisture characteristic curves of the two different soil layers are demarcated.By the relation equation between the relative soil water content and soil water potential,the farmers can judge the relative soil water content according to the dynamic soil water potential in the different soil layers,so that they can easily master soil water situation to make the irrigation schedule in the production of the cotton.