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Evaluating crop response and environmental impact of the accumulation of phosphorus due to long-term manuring of vertisol soil in northern China

文献类型： 外文期刊

作者： Hua, Keke 1 ; Zhang, Wenju 2 ; Guo, Zhibin 1 ; Wang, Daozhong 1 ; Oenema, Oene 3 ;

作者机构： 1.Anhui Acad Agr Sci, Soil & Fertilizer Res Inst, Anhui Prov Key Lab Nutr Recycling Resources & Env, Hefei 230031, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Crop Nutr & Fertilizat, Minist Agr, Beijing 100081, Peoples R China

3.Wageningen Univ, Environm Sci, NL-6700 AA Wageningen, Netherlands

关键词： Soil Olsen-P;Long-term fertilization;Farmyard manure;P environmental pollution

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

ISSN：

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收录情况： SCI

摘要： The availability of soil phosphorus (P) is one of the key factors that regulate crop productivity. Fertilization practices with P fertilizers carry a high risk of non-point environmental pollution due to water run-off and leaching. The present work discusses data from a 29-year (1982-2011) fertilization experiment with wheat-soybean rotation. Its aim was to quantify and evaluate the dynamic of soil P availability in relation to P accumulation, crop yield, and environmental safety in northern China. This study included six treatments with four field replicates: CK (no fertilizer), NPK (mineral fertilizers), 1/2SNPK (mineral fertilizers plus 50% wheat straw return), SNPK (mineral fertilizers plus 100% wheat straw return), PMNPK (mineral fertilizers plus pig manure), and CMNPK (mineral fertilizers plus cattle manure). Continual additional application of farmyard manure (i.e., PMNPK and CMNPK) produced significantly (P < 0.01) better soil total P and Olsen-P than NPK treatment, and both factors showed increasing trends. However, straw incorporation (i.e., 1/2SNPK and SNPK) had no effect on soil P or Olsen P. There were significant positive correlations between P budget and increase in Olsen-P and total P. These correlations indicated that, with each 100 kg ha(-1) of P budget, there were about 1.0-1.1 and 22.5-26.0 mg kg(-1) increases in Olsen-P and total P for the straw incorporation treatments, whereas there were 5.7-5.9 and 26.5-30.8 mg kg(-1) increases in Olsen-P and total P for use of manure. Average P activation coefficients for soil Olsen-P in the PMNPK and CMNPK treatments increased sharply by 87.2% and 121.3% compared to the NPK treatment (P < 0.01). Two segment regression analyses indicated there to be observable changes in the relationships between Olsen-P and relative crop yield, and in Olsen-P and soluble-P, indicating critical Olsen-P levels of 11 mg kg(-1) for crop yield, and 18 mg kg(-1) for soluble P, respectively. In conclusion, much more P is available in the soil under long-term farmyard manure than crop straw incorporation when the amount of P accumulation is uniform. Long-term, continuous, excessive use of farmyard manure to increase crop yield is not sustainable and has a high risk of P environmental pollution. The incorporation of crop straw is a recommended means of managing which decreases the risk of P environmental pollution without compromising crop productivity of vertisol soil in northern China. (C) 2015 Elsevier B.V. All rights reserved.

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