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为了研究“氮调”法在晚稻生产上的应用价值,于1984、1985年用~(15)N肥在白土和黄泥土上进行盆缽和大田微区试验,同时在大田进行小区“氮调”试验.结果表明,在太湖地区的白土上,9N曲线“氮调”施肥法基本适用;在黄泥土上不太适用,需提高后期用氮量.在幼穗分化前,在白土上的稻株中氮来自肥料的占23～30%;黄泥土为32～40%.此后约80%以上的氮素是由土壤供给.稻株对氮肥的利用率,基肥为20%,追肥氮的累积刊用率,始孽期为23～35%;齐穗期为35%左右.齐穗期N和~(15)N的体内分配率几乎相同,叶中60%,根中11～16%;成熟期穗中57%,叶中23%左右.“氮调”施肥法可节省硫铵14公斤/亩.
In order to study the application value of “Nitrogen” method in late rice production, basin and field micro-experiments were conducted on white clay and yellow soil with ~ (15) N fertilizers in 1984 and 1985, The results showed that the 9N curve “Nitrogen” fertilization method was basically suitable on the white soil in Taihu Lake area, but was not suitable on the yellow soil, Nitrogen from the fertilizer accounts for 23 to 30% of the strain and from 32 to 40% of the yellow soil, followed by more than 80% of the nitrogen supplied by the soil. The utilization of nitrogen fertilizer by rice plants is 20% for basal fertilizer, The rate of initiation was 23-35% in heading stage and 35% in heading stage. The distribution rates of N and ~ (15) N in heading stage were almost the same, 60% in leaves and 11-16% in roots. 57% mature ears, leaves about 23%. “Nitrogen” fertilization method can save ammonium sulfate 14 kg / acre.