Evaluating the Impact of Crop Layout Changes on N and P Nutrient Balance: A Case Study in the West Liaohe River Basin, China

Regional crop layout has changed significantly due to climate, policy, and other factors, which impacted farmland nutrient balance. Here, we evaluated the impact of changes on N P balance in West Liaohe River Basin from 2000–2015. The study area long been a surplus state. unit exhibited downward trend showed an increasing trend. Significant correlations existed between planting areas surplus. was mainly concentrated lower reaches basin. wheat must be reduced maize soybean controlled adjust reduce environmental pollution risk. Chemical fertilizer seed inputs are main sources input. Furthermore, combining farming pastoral is conducive improving use efficiency. Manure can absorbed by farmland, ratio organic chemical fertilizers reasonably set, application reduced.