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Optimizing Soil and Fertilizer Phosphorus Management According to the Yield Response and Phosphorus Use Efficiency of Sugarcane in Southern China

文献类型： 外文期刊

作者： Wu, Qihua 1 ; Zhou, Wenling 1 ; Chen, Diwen 1 ; Cai, Andong 2 ; Ao, Junhua 1 ; Huang, Zhenrui 3 ;

作者机构： 1.Guangdong Prov Bioengn Inst, Guangzhou Sugarcane Ind Res Inst, Guangdong Key Lab Sugarcane Improvement & Biorefi, Guangzhou 510316, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Engn Lab Improving Qual Arable Land, Beijing 100081, Peoples R China

3.Guangdong Acad Agr Sci, Guangdong Prov Key Lab Crop Genet & Improvement, Crops Res Inst, Guangzhou 510640, Peoples R China

关键词： Yield-increasing effect; Critical value of available P; PUE; Soil P budget

期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.872； 五年影响因子：3.771 ）

ISSN： 0718-9508

年卷期：

页码：

收录情况： SCI

摘要： The objective of this study was to determine the suitable range of available phosphorus (P) and fertilizer application rate in a sugarcane-growing region with red soil in southern China. Thirty-five monitoring sites were selected to investigate the soil available P in relation to crop yield, P-use efficiency (PUE) and soil total P under four different P rates. Compared with the no-P treatment, all three treatments involving fertilizer P presented sugarcane yields increased to varying extents, with an average increase of 17.6-25.8%. The yield-increasing effects and PUE in each P treatment decreased with increasing soil available P. The agronomic critical values of available P for sugarcane according to the linear-linear, linear-plateau and Mitscherlich models were 27.7, 41.5 and 17.0 mg kg(-1), respectively. When the response of the yield-increasing effects of P fertilizer to soil available P and the agronomic critical values of the three models were combined, the linear-linear model exhibited the best fit. An observable change occurred in the available P response to total P. After the change point, the available P increased dramatically with increasing total P, possibly leading to decreased PUE or even triggering water pollution. Therefore, 28-50 mg kg(-1) is the suggested range of suitable soil available P for the sugarcane-growing region. In addition, when the soil P budget and current relatively high level of available P are considered, applications of P fertilizer at 120 kg P2O5 ha(-1) (1/2 the conventional P fertilizer rate) are recommended in this region.

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