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Severe water deficit reduces the rate of potassium diffusion from the soil to the root system, while moderate water deficit increases the rate of potassium diffusion from the soil to the root system, which is one of the reasons for the decrease of soil potassium nutrient content. Both the yield and the biological yield of the regulated deficit irrigation were high, resulting in the large amount of potassium and nutrients in the grain and straw. Therefore, the consumption of available potassium in the soil was severe, resulting in a decrease in the soil potassium content. This is the soil total potassium and available potassium. The main reason for the decrease in content.
The determination of soil total phosphorus and available phosphorus by soil N, P and K detectors indicated that the regulated deficit irrigation of spring wheat had a significant effect on soil phosphorus nutrients. During the spring wheat harvest in 2003, the total soil phosphorus content in the soil treated with different water deficits in the 0-20cm soil layer was reduced by 6.0%-21.6% from the initial value of the test, and the increase and decrease rate of the available phosphorus was -4.3%-39.5% relative to the initial value of the experiment. %, the initial value of the control FFF total phosphorus ratio test decreased by 18.1%, and the available phosphorus increased by 4.7%.
The initial value of total nitrogen ratio increased by 6.3%~28.4% in different water deficit treatments in 0~20cm soil layer, and the alkalinity nitrogen decreased by 10.2%~21.1% from the initial value of the test, and the initial value of the control FFF total nitrogen ratio increased by 6.3%. %, alkaline hydrolysis of nitrogen than the initial value of the test decreased by 14.4%, water deficit adjustment in the treatment of total nitrogen than the control increased by 0% to 20.8%, while the alkaline hydrolysis of nitrogen than the control increases and decreases, but the increase is smaller,
Changes in soil total potassium and available potassium through soil NPK indicator values ​​showed that the increase and decrease of the initial value of the test soil in the 0~20cm soil layer with different water deficit treatments during the spring wheat harvest The amplitudes are different. Except for the range of increase and decrease of the initial value of the test value of available potassium from 20 to 40cm soil layer in the range of -23.1%~13.2%, the ratio of total potassium and available potassium in the soil treated with different water deficit treatments and control FFF The initial value of the test is significantly reduced.
The test using soil NPK analyzer revealed that soil nutrient changes in spring wheat regulated deficit irrigation have a major impact on soil organic matter, total nitrogen, alkali-hydrolyzed nitrogen, total phosphorus, available phosphorus, total potassium, potassium, and pH. Therefore, the efficient management of agricultural production water and the pursuit of high crop yields should fully consider the sustainable use of soil nutrients and balanced fertilization. In addition, under moderate drought conditions, moderate water deficits in spring wheat have different degrees of reduction in total potassium and available potassium content in 0-20 cm soil layers.