Effect of Soil Amendment of Greening Waste on Leaching Loss of Soil Nitrogen and Phosphorus

Abstract

It is of great practical significance for comprehensively promoting the green development of agriculture to explore practical products for preventing and controlling nitrogen and phosphorus leaching. In this study, PVC soil column experiments and field experiments were used to evaluate the interception effect of soil amendments produced by green wastes on nitrogen and phosphorus leaching. The pH value, EC value, the nutrient contents of ammonium nitrogen (NH4 +-N), nitrate nitrogen (NO3 −-N), total nitrogen (TN), and available phosphorus (AP) in different soil layers and leaching solution were determined, and the interception effects of soil amendment on nitrogen and phosphorus leaching were comprehensively evaluated. The results showed that the soil amendments of green waste had significant inhibition and control effects on the leaching of NH4 +-N, NO3 −-N, APs, and TN. The interception mechanism of the soil amendments of green waste on nitrogen and phosphorus leaching was mainly to absorb a large amount of leaching solution and various forms of nitrogen and phosphorus nutrients. The results also showed that the soil amendment of green waste had a certain nutrient content and buffering effect on acid and alkali and the main form of nitrogen leaching was NO3 −-N. This study provides a theoretical basis for the development of cheap and effective physical products to prevent and control nitrogen and phosphorus leaching from farmland.