为了探明不同施氮水平对优质食用型小籽粒花生品种‘赣花7号’氮素代谢和生长发育的影响，通过田间试验与室内分析相结合的方法，研究了0、75、150、225、300和375 kg/hm2 6个施氮水平下该花生品种的氮素代谢、根瘤生长和产量的响应。结果显示，与氮代谢相关的花生叶片可溶性蛋白、硝酸还原酶活性和谷氨酰胺合成酶活性，根瘤生长量、根瘤大小及产量在各生育期均表现出随着施氮水平的增加呈现先增后减的趋势，且以施氮水平为225 kg/hm2时的花生叶片氮代谢最为活跃，根瘤数较多，根瘤也较大，产量最高。‘赣花7号’在150~225 kg/hm2的施氮水平下氮素利用、根瘤生长和产量较好。
To assess the effects of different N application levels on nitrogen metabolism and growing development of high quality edible-type and small grain peanut ('Ganhua 7 hao'), this paper researched the responses of nitrogen metabolism, nodule growth and yield under N application levels (N0, 0 kg/hm2; N75, 75 kg/hm2; N150, 150 kg/hm2; N225, 225 kg/hm2; N300, 300 kg/hm2 and N375, 375 kg/hm2) by combining of field experiment and laboratory analysis. The results showed that soluble protein contents, nitrate reductase activity and glutamine synthetase activity of leaf related to nitrogen metabolism, nodule growth and grain yield were improved first and reduced afterwards with the increasing amount of the N- fertilization increasing at each growth period. Leaf nitrogen metabolism and yield of peanut were the best and nodule number and size were more under N225 treatment. Nitrogen use, nodule growth and yield of 'Ganhua 7 hao' were better at 150-225 kg/hm2 N application levels.