Evaluation of N2 fixation and N absorption activity by relative ureide method in field-grown soybean plants with deep placement of coated urea
Evaluation of N2 fixation and N absorption activity by relative ureide method in field-grown soybean plants with deep placement of coated urea
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相对酰脲法评价深埋包膜尿素大田大豆固氮和吸氮活性
DOI：
10.1080/00380768.1992.10416700
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发表时间：
1992
影响因子：
2
通讯作者：
T. Ohyama
中科院分区：
文献类型：
--
作者：
Yoshihiko Takahashi;Toshiaki Chinushi;T. Nakano;T. Ohyama
摘要为了评价包膜尿素肥深施对大豆植株（Glycine max (L.)）的有益效果。稳定。简历。在恩瑞（Enrei）栽培条件下，进行了3种氮肥处理的田间试验：对照，常规基肥16 kg N ha-1作为硫酸铵；100 kg N hm -1作为100 d型包膜尿素深施；开花期前追施70 d型包膜尿素100 kg N hm -1。根瘤固氮活性和根系氮吸收率的季节变化通过计算总氮积累量的增加来测定根出血木质部汁液中相对脲氮丰度。采用15N示踪法测定肥料氮素回收率。在R7期，深施包膜尿素植株的氮素回收率约为62%，远高于追施包膜尿素植株的33%。追肥处理抑制了氮固定。
Abstract In order to evaluate the beneficial effect of deep placement of coated urea fertilizer on soybean plant (Glycine max (L.) Merr. cv. Enrei) cultivation, a field experiment was conducted with three fertilizer N treatments: control, conventional basal dressing of 16 kg N ha-1 as ammonium sulfate; basal deep placement of 100 kg N ha-1 as 100 d type coated urea; and top dressing of 100 kg N ha-1 as 70 d type coated urea just before the flowering stage. The seasonal variation in the N2 fixation activity by the nodules and N absorption rates by roots were estimated by the determination of the relative ureide-N abundance in the root bleeding xylem sap by calculating the increase in total N accumulation. The N recovery rate from fertilizers was measured by the 15N tracer method. The N recovery rate in the plants with deep placement of coated urea was about 62%, and much higher than that of the plants with top dressing of coated urea (33%) at the R7 stage. Top dressing treatment depressed the N2 fixation a...