Determining N supplied sources and N use efficiency for peanut under applications of four forms of N fertilizers labeled by isotope 15N

WANG Cai-bin; ZHENG Yong-mei; SHEN Pu; ZHENG Ya-ping; WU Zheng-feng; SUN Xue-wu; YU Tian-yi

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Determining N supplied sources and N use efficiency for peanut under applications of four forms of N fertilizers labeled by isotope 15N

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Rational application of different forms of nitrogen(N) fertilizer for peanut(Arachis hypogaea L.) requires tracking the N supplied sources which are commonly not available in the differences among the three sources:root nodule,soil and fertilizer.In this study,two kinds of peanut plants(nodulated variety(Huayu 22) and non-nodulated variety(NN-1)) were choosed and four kinds of N fertilizers:urea-N(CONH_2-N),ammonium-N(NH_4^+-N),nitrate-N(NO_3^--N) and NH_4^+ +NO_3^--N labeled by^(15)N isotope were applied in the field barrel experiment in Chengyang Experimental Station,Shandong Province,China,to determine the N supplied sources and N use efficiency over peanut growing stages.The results showed that intensities and amounts of N supply from the three sources were all higher at middle growing stages(pegging phase and podding phase).The accumulated amounts of N supply from root nodule,soil and fertilizer over the growing stages were 8.3,5.3 and 3.8g m^(-2) in CONH_2-N treatment,which are all significantly higher than in the other three treatments.At seedling phase,soil supplied the most N for peanut growth,then root nodule controlled the N supply at pegging phase and podding phase,but soil mainly provided N again at the last stage(pod filling phase).For the whole growing stages,root nodule supplied the most N(47.8 and 43.0%) in CONH_2-N and NH_4^+-N treatments,whereas soil supplied the most N(41.7 and 40.9%) in NH_4^+ +NO_3^--N and NO_3^--N treatments.The N use efficiency was higher at pegging phase and podding phase,while accumulated N use efficiency over the growing stages was higher in CONH_2-N treatment(42.2%) than in other three treatments(30.4%in NH_4^+-N treatment,29.4%in NO_3^--N treatment,29.4%in NH_4^+ +NO_3^--N treatment).In peanut growing field,application of CONH_2-N is a better way to increase the supply of N from root nodule and improve the N use efficiency.

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《农业科学学报（英文版）》 |2016年第2期|432-439|共8页
作者
WANG Cai-bin; ZHENG Yong-mei; SHEN Pu; ZHENG Ya-ping; WU Zheng-feng; SUN Xue-wu; YU Tian-yi;
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Shandong Peanut Research Institute,Qingdao 266100,P.R.China;

Shandong Peanut Research Institute,Qingdao 266100,P.R.China;

Shandong Peanut Research Institute,Qingdao 266100,P.R.China;

Shandong Peanut Research Institute,Qingdao 266100,P.R.China;

Shandong Peanut Research Institute,Qingdao 266100,P.R.China;

Shandong Peanut Research Institute,Qingdao 266100,P.R.China;

Shandong Peanut Research Institute,Qingdao 266100,P.R.China;

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Determining N supplied sources and N use efficiency for peanut under applications of four forms of N fertilizers labeled by isotope 15N

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