Optimum Management of Water and Fertilizer for Potato in Soft rock and Sand Compound Soil Based on WHCNS Model: Scenario Prediction

Soil Water Heat Carbon and Nitrogen Simulator (WHCNS) model was used to simulate the soil water and fertilizer coupling effect of potato in soft rock and sand compound soil, with a view to establishing a scheme to optimize soil water and fertilizer in local climate and soil properties. In this study, excessive irrigation will directly lead to a significant increase in water leakage. When irrigation or relatively large rainfall occurs, the soil moisture leakage increases significantly. Especially when there is a coincidence between irrigation and rainfall periods, the corresponding water leakage increases even more drastically. For the water and fertilizer management of potato in the soil under the meteorological conditions in the study area, an irrigation system of no more than 119 mm and a fertilization system of no more than 121 kg N/hm2 can be adopted. Excessive irrigation and fertilization cannot obtain more. Crop yields can only lead to increased water and fertilizer losses and reduced water and fertilizer use efficiency.