Title: Impacts of nitrogen application amounts on grain quality and mineral elements concentrations of Japonica rice in Jianghuai River area
Abstract: Field experiments on two Japonica rice varieties(Zhendao 88 and Nanjing 44) were conducted to study the impacts of nitrogen(N) application amounts(0 kg/hm2,150 kg/hm2,300 kg/hm2) on grain quality and mineral concentrations.Similar impacts of N application levels were found on the varieties.Grain quality indicators of brown rice rate,milled rate,head rice rate,chalkiness size,chalky grain rate,chalkiness decreased and length-width ratio increased along with the increase of N application amount.The head rice rate,chalky grain rate declined significantly and length-width ratio increased significantly in high-nitrogen-level treatment.The effect of nitrogen fertilization was bigger on appearance quality than on processing quality.Grain amylose content dropped,while protein content rose in the grain as N application amount went up,and protein content increased significantly in high nitrogen level.The contents of most mineral elements(Mg,Ca,P,Fe,Zn,Cu) except Mn in milled rice decreased with N application rates,and the contents of other elements varied among rice cultivars.The results demonstrate that N application may sacrifice the processing quality and mineral nutrition,but improve the appearance quality of Japonica rice in Jianghuai River area.Determining the optimal N application rate for a rice crop requires comprehensive consideration of all the aspects of production,including the integration of high yield and high nitrogen use efficiency,and simutaneous improvement of yield and mineral mutrition.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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