Title: Effects of Nitrogen Applications on Soil Phosphorus Balance of Winter Wheat in a Rice-wheat Rotation
Abstract:It is very important to elucidate temporal-spatial distribution of soil available phosphorus( P) content,P uptake and soil P apparent surplus amount to better utilize P fertilizer.In this study,by usi...It is very important to elucidate temporal-spatial distribution of soil available phosphorus( P) content,P uptake and soil P apparent surplus amount to better utilize P fertilizer.In this study,by using two cultivars of wheat( Triticum aestivum L.cv Ningmai 9 cv Yumai 34),field experiments with different nitrogen applications( 0 kg/ha and 1∶9,3∶ 7,5∶5,7∶3 at 225 kg/ha) were conducted in Nanjing during 2010 and 2011.The results showed that P uptake peak was from jointing to anthesis,and the treatment N5 /5 reached the highest.Soil available P content in 0- 40 cm soil layer decreased with the increase of basal nitrogen fertilizer application before jointing,and was the lowest when the basal to topdressing fertilization ratio was at 5 ∶ 5 after jointing.Soil P surpluses and deficits were obviously linked to growth-stage features.P surplus occurred from sowing to jointing,and P deficit occurred from jointing to maturity.During the whole growing season,P apparent surplus was the lowest when the basal to topdressing nitrogen fertilization ratio was at 5∶ 5,and the highest when the basal to topdressing nitrogen fertilization ratio was at 1∶ 9.It can be concluded that Ningmai 9 and Yumai 34 reduced P2O5rate 6.5 and 8.4 kg /ha at105 kg /ha respectively,combined application of 225 kg /ha( the basal to topdressing fertilization ratio was 5 ∶ 5),which could improve grain yield and reduce loss of P in wheat production.Read More
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 1
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