长期定位施肥对土壤有机质、不同形态氮含量及作物产量的影响
刘学彤1(), 郑春莲1, 曹薇2, 党红凯1, 曹彩云1,3, 李晓爽4, 李科江1,3, 马俊永1,3()
Effects of Long-Term Located Fertilization on Soil Organic Matter, Nitrogen Forms and Crop Yields
Liu Xuetong1(), Zheng Chunlian1, Cao Wei2, Dang Hongkai1, Cao Caiyun1,3, Li Xiaoshuang4, Li Kejiang1,3, Ma Junyong1,3()

图1. 不同处理土壤有机质含量
不同小写字母表示差异显著(P<0.05),下同

Fig.1. Soil organic matter contents in different treatments
Different lowercase letters indicate significant difference (P<0.05), the same below