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《Acta Prataculturae Sinica》 2009-01
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The effects of long-term fertilization on crop yields and farmland nutrient equilibrium

LI Xin-wang,MEN Ming-xin,WANG Shu-tao,QI Yue-pu,XU Hao(College of Resources and Environmental Sciences,Agricultural University of Hebei,Baoding 071001,China)  
Yield response and farmland nutrient equilibrium were studied in fluvo-aquic soils of the North China Plain,and the results provided a theoretical basis for high yield-high efficiency and sustainable development of grain production on a field-block scale.Fertilization treatments were used in a long-term experiment to study yield response and farmland nutrient equilibrium.The 7-year fertilization experiment to study crop responses and farmland nutrient showed that for wheat the 7-year mean yields ratio of treatments CK,P2K2,N2K2,and N2P2 to N2P2K2 were 25.5%,34.5%,43.3%,and 83.2% respectively while those for maize were 42.3%,52.7%,70.6%,and 76.2%.The N supply capacity of fluvo-aquic soils in the absence of N fertilizer declined to 59% of the original in the first year investigated,fell to 43% in the second year,and then fluctuated around 40% in the following years.Without P fertilizer application,soil P capacity decreased to 72% in the first year,fell to 55% in the third year,and then fluctuated around 55%.The K supply capacity without K fertilizer addition changed from 93% in the first year to about 76% in the 7th year of the experiment.The best treatments of farmland N equilibrium were N2P1K2 and N2P2K1,of P was N2P1K2,of K was P2K2,and of N,P,K was N2P1K2.The cumulative apparent recovery rates of N,P,K fertilizers on crops of wheat and maize were 44.3%,31.2%,53.0% and 40.8%,28.9%,50.3% respectively.There were significant correlations between amount of fertilizer and yield response.N was the main limiting factor for crop yield,then P and K.The better treatment for farmland N,P,K equilibrium was N2P1K2.
【Fund】: 973国家重点基础研究发展规划项目(2005CB121107)资助
【CateGory Index】: S158
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