Soil organic carbon, total nitrogen and grain yields under long-term fertilizations in the upland red soil of southern China

文献类型： 外文期刊

第一作者： Zhang, Wenju

作者： Zhang, Wenju;Xu, Minggang;Wang, Boren;Wang, Xiujun

作者机构：

关键词： Red soil;Long-term fertilization;Grain yield;Soil organic carbon;Total nitrogen

期刊名称：NUTRIENT CYCLING IN AGROECOSYSTEMS （ 影响因子：3.27； 五年影响因子：3.767 ）

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收录情况： SCI

摘要： A long-term experiment with various fertilizations was carried out during 1990-2006 in a double cropping system rotated with wheat (Triticum Aestivium L.) and corn (Zea mays L.) in the red soil of southern China. The experiment consisted of eight treatments: non-fertilization (CK), nitrogen-phosphorus fertilization (NP), phosphorus-potassium fertilization (PK), nitrogen-phosphorus-potassium fertilization (NPK), pig manure (M), pig manure and NPK fertilization (NPKM), high rates of NPKM (hNPKM), and straw returned with inorganic fertilizers (NPKS). Applications of manure (i.e., M, NPKM and hNPKM) significantly increased soil organic carbon (SOC) and total nitrogen contents. Applications of inorganic fertilizers without manure showed small influences on SOC, but resulted in declines of soil total nitrogen over the long-term experiment. Grain yields were more than doubled under fertilizations for both wheat and corn, with the highest under the NPKM and hNPKM treatments and the lowest under non-fertilization. Long-term cropping practices without fertilization or with unbalanced fertilizations (e.g., NP and PK) caused low grain yields. The balanced fertilization of NPK increased grain yields. However, such practice was not able to maintain high grain yields during the last few years of experiment. Our analyses indicate that both wheat and corn grain yields are significantly correlated with SOC, total and available nitrogen and phosphorus. However, the relationships are stronger with total nitrogen (r = 0.5-0.6) than with available nitrogen (r = 0.26-0.3), indicating the importance of maintaining soil total nitrogen in agricultural practice.

分类号： TQ44

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