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水稻特别是691这样生长期长的品种,由于生长前期在土壤中吸收了大量的氮素,加上排灌等因素造成的氮素损失,使生长后期容易缺氮。这时稻株的根系活力开始下降,吸收能力减退,叶面积也逐渐减少。这时若能补充氮肥,则可养根保叶,提高光合率,减少颖花退化,从而提高产量。1979年我县子陵公社的幸福大队一生产队和子陵大队一生产队,69l中稻田大面积发生白叶枯病,严重度三级,普遍率六级。
Long-growing rice varieties, especially 691, have a large amount of nitrogen absorbed in the soil at the early growth stage, and nitrogen losses due to irrigation and drainage are likely to cause nitrogen deficiency in the late growth stage. At this time, the root activity of rice plants began to decline, with diminished capacity and reduced leaf area. At this time if you can add nitrogen fertilizer, you can raise leaves, increase photosynthetic rate, reduce spike degradation, thereby increasing production. In 1979, a production team of a happy brigade and a production team of Zi Ling Brigade in Ziling Commune of our county, a large-scale bacterial blight occurred in 691 medium-sized paddy field, with a severity of three and a general prevalence of six.