Study on the effects of counter tillage on runoff and sediment yield and process of nitrogen and phosphorus nutrient loss on sloping farmland

This experiment was completed from July 2021 to May 2022 in the runoff community and soil and water conservation engineering laboratory of Yangling High tech Industrial Demonstration Zone in Xianyang City, Shaanxi Province. The projection length of the runoff community is 4.5 meters, and the projection width is 1.4 meters. The experimental data includes the results of artificial simulated rainfall experiments, as well as the nutrient content results in runoff and sediment samples. A rainfall intensity of 90 mm/h was selected for the artificial simulated rainfall experiment, with a rainfall time of 40 minutes. The total rainfall for each rainfall was 60 mm, and the interval time for sample collection was 2 minutes. Simultaneously select two slope treatment measures: cross slope ridge planting and flat slope surface. The results of the rainfall experiment include the initial runoff time, flow rate, and sediment yield during the rainfall process. The nutrient content results in the runoff and sediment samples are the total nitrogen and total phosphorus content in each group of runoff and sediment samples.