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本文用~(15)N示踪法在温室条件下,研究紫云英植株上不同器官组成的标本和尿素的肥效;着重讨论绿肥的氮素有效度问题。1.以水稻的分蘖动态作为绿肥N有效度的定性指标;2.用C∶N预估绿肥N对当季水稻的有效度未能得到满意的效果,但是它同后作蕹菜在淹水栽培下吸取的氮量之间的相关性却很高,并分析其原因;3.多元回归与相关的分析结果指出,提高绿肥N有效度要求高氮又高碳和低C∶N比;4.讨论了有关增加紫云英肥效的一些农业措施问题。
In this paper, the application of ~ (15) N tracer method in greenhouse conditions, the different organs of Astragalus plants composition and urea fertilizer efficiency; emphasis on the effectiveness of green manure nitrogen. 1. Using the tillering dynamics of rice as the qualitative index of N validity of green manure; 2. Using C: N to estimate green manure N can not get satisfactory effect on the validity of rice in the current season, The correlation between the amount of nitrogen uptake is very high, and analyze the reason; 3.Multiple regression and related analysis results show that to improve the validity of green manure N requires high nitrogen and high carbon and low C: N ratio; Discussed some of the agricultural measures to increase the effectiveness of Astragalus.