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本试验在室内盆栽条件下进行 1980年旱季试验:IR36在0.5+0.2克N/盆的谷粒产量比ON和1.0+0.5克N/盆的处理分别增产稻谷64.1和14.3％;IR42在0.5+0.2克N/盆比在ON和1.0+0.5克N/盆分别增产70.1和15.8％;IR50则以1.0+0.5克N/盆处理的谷粒产量为高,比ON和0.5+0.2克N/盆分别增加稻谷66.4和19.2％。而这三个品种在上述三个氮水平条件下比较,以IR36的产量为高,IR36比IR42分别增加谷粒产量22.2、6.8和8.4％。但在1.0+0.5克N/盆处理则以IR50的产量最高。 1981年雨季试验:IR36在开花前26天追施氮肥比开花前12天施氮肥增产稻谷11.7％,比ON处理增产79.8％;IR42在开花前28天追施氮肥比开花前14天施氮肥增产20.7％。比ON处理增产82.9％。而IR36比IR42在同等氮水平和在生育中期同时追施氮肥的情况下分别增加谷重34.4、22.6和30.5％。 在各个氮水平中,三个品种的茎、叶器官含氮量随生育期的推进而下降,到成熟时的含氮量最少,而谷粒含氮量则随之而增加,到成熟时含氮量占植株总氮的60～70％。但IR36比IR42及IR50从茎秆运转到谷粒的氮量较多,谷粒中积累氮量(％)较高,谷粒中积累氮量的百分比多少与谷粒产量成正相关,推断这是高产品种和高产栽培的高产生理指标之一。
In this experiment, the experiment of dry season in 1980 was carried out under the condition of indoor pot experiment: grain yield of IR36 at 0.5 + 0.2g N / pot was increased by 64.1% and 14.3% respectively compared with ON and 1.0 + 0.5g N / 0.2 g N / pot increased yield by 70.1 and 15.8% respectively at ON and 1.0 + 0.5 g N / pot; IR50 increased grain yield at 1.0 + 0.5 g N / The pots increased 66.4 and 19.2% of paddy, respectively. The three cultivars were compared under the above three nitrogen levels with high IR36 yield and IR36 increased grain yield by 22.2, 6.8 and 8.4% respectively over IR42. However, at 1.0 + 0.5 g N / pot treatment, the yield of IR50 was the highest. 1981 rainy season experiment: IR36 topdressing nitrogen 26 days before flowering nitrogen than 11 days before flowering nitrogen application 11.7%, 79.8% increase than ON treatment; IR42 top 28 days before flowering topdressing nitrogen than 14 days before flowering nitrogen application 20.7%. 82.9% more yield than the ON treatment. While IR36 increased the grain weight by 34.4, 22.6, and 30.5%, respectively, at the same level of nitrogen compared to IR42 and at the same time during the second trimester. In all nitrogen levels, the nitrogen content of stem and leaf organs of three cultivars decreased with the growth period, and reached the lowest nitrogen content at maturity and the nitrogen content of grain increased with it. Nitrogen accounts for 60 ~ 70% of the total plant nitrogen. However, IR36 had a higher nitrogen content from stem to grain than IR42 and IR50, higher N accumulation (N%) in grain, positive correlation between N accumulation in grain and grain yield High-yielding varieties and high-yielding cultivation of high-yielding physiological indicators.