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Effects of long-term fertilization on corn productivity and its sustainability in an Ultisol of southern China

文献类型： 外文期刊

作者： Huang, Shan 2 ; Zhang, Weijian 1 ; Yu, Xichu 3 ; Huang, Qianru 3 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, Minist Agr, Key Lab Crop Ecol Physiol & Prod, Beijing 100081, Peoples R China

2.Nanjing Agr Univ, Inst Appl Ecol, Nanjing 210095, Peoples R China

3.Jiangxi Inst Red Soil, Jinxian 331700, Peoples R China

关键词： climatic factor;corn productivity;soil quality improvement

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：5.567； 五年影响因子：6.064 ）

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收录情况： SCI

摘要： Appropriate fertilization practices play a critical role in enhancing crop yields, as well as in achieving sustainable increases in crop production through improving soil quality. In the present study, we examined the effects of long-term fertilization (started in 1986) on crop yield and its sustainability under a double corn (Zea mays L) cropping system in an Ultisol of southern China. Results showed that although corn yields were higher in the fertilized treatments compared to the unfertilized control, inorganic fertilizer application alone (N and NPK) resulted in declining trends in both corn yields and fertilization effects (defined as the yield difference between the fertilized treatment and the control), especially in the N treatment. In contrast, significant increasing trends in both corn yields and fertilization effects were observed in the manure-applied treatments. Manure amendments significantly increased the contents of soil organic carbon and total N and the availability of soil P and K, while long-term inorganic fertilization alone accelerated soil acidification, especially in the N treatment. In addition, there was no significant correlation between the yield trend and climatic factors (weather trends) over the period of study. Thus, it is likely that the long-term sustainability of corn production under manure application is attributed mainly to the improved soil quality. Our results also suggest that manure amendments, particularly in combination with inorganic NPK, should be the recommended fertilization practice to enhance corn yields and improve soil quality in the Ultisol. (C) 2010 Elsevier B.V. All rights reserved.

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