招远市位于胶东半岛西北部，土壤多为棕壤土类，地貌以丘陵山地为主，近年来，随着种植业结构的进一步调整，果业生产发展迅猛，苹果种植面积已达到４０．５万亩，成为当地农村经济的支柱产业之一。但是，由于受传统农业的影响，果农单纯追求产量，盲目施肥，造成土壤养分失衡 Zhaoyuan City is located in the northwestern part of Jiaodong Peninsula. Most of the soil is brown earth and the landscape is dominated by hills and mountains. In recent years, with the further adjustment of planting structure, the fruit industry has witnessed rapid development and the area planted with apple has reached 405,000 Mu, becoming one of the pillar industries in the local rural economy. However, due to the impact of traditional agriculture, farmers simply pursue output, blindly fertilize, resulting in soil nutrient imbalance