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《Journal of Anhui Agricultural Sciences》 2010-19
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Study on the Risk of the Loss of Nitrogen and Phosphorus in Vegetable Land in Guangdong

ZHANG Yong-qi et al(Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong 510650)  
[Objective] The guidance for the fertilization in vegetable field in Guangdong could be provided based on the mastering of the situation of nitrogen and phosphorus in soil for the reduction of their loss.[Method] The nitrogen application rate(NAR)in 74 locations of Guangdong was investigated and the content of phosphorus available in soil was determined with three methods of Olsen-P,Mehlich1-P and Mehlich3-P.[Results]The results showed that average NAR was 328.7 kg/hm2.95.9% of the investigation data in NAR was higher than the critical value(90 kg/hm2),which can cause loss when NAR was higher than critical value.Meanwhile,66.7% of Olsen-P content,96.0% of Mehlich1-P content and 55.8% of Mehlich3-P content were higher than critical value(60 mg/kg for Olsen-P,31 mg/kg for Mehlich1-P and 150 mg/kg for Mehlich3-P),respectively.[Conclusion] The content of nitrogen and phosphorus in vegetable field in Guangdong was high with a great risk of their losing.
【Fund】: 广东省重大科技专项(2008A080800028 2009A080303008)
【CateGory Index】: X53
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