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1985～1986年,在田间和盆栽试验条件下,采用~(15)N示踪技术,对麦茬旱种水稻苗期施氮(三叶一心期前)与产量形成的关系及苗期需氮规律进行了探索.结果表明,苗期植株氮主要来源于土壤,追肥氮所占比重只有1/4～1/5.研究还表明,麦茬旱种水稻苗期对氮肥的利用率较低,认为培肥土壤对麦茬旱种水稻幼苗生长很重要.因而,从经济观点分析,在土壤肥力较高的条件下,苗期不宜施氮.
From 1985 to 1986, under the field and pot experiment conditions, the relationship between the application of nitrogen and the yield formation and the nitrogen requirement at the seedling stage were studied using ~ (15) N tracer technique at the seedling stage, The results showed that plant nitrogen mainly came from soil at the seedling stage, and the proportion of topdressing nitrogen was only 1/4 ~ 1 / 5. The research also showed that the utilization rate of nitrogen fertilizer was lower in the dry seedling stage of wheat stubble, Fertilizing soil is very important to the growth of wheat seedlings under dry cultivation of wheat stubble.From the economic point of view, under the conditions of higher soil fertility, nitrogen should not be applied at seedling stage.