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僵苗是双季早稻生产上的一个突出问题。僵苗表现为植株矮小,发棵很差,叶片直立,新叶顶端发黄、枯死,根子发黄、发红、发黑,新根极少,生长停滞。僵苗发生的原因,根据我们初步调查,主要有以下几个方面: 1.土壤瘠薄 我县早稻僵苗有相当一部分发生在白土、淀浆白土、死黄土等低产土壤上。这些土壤有机质含量极少,含磷一般在万分之六左右,含氮量在千分之一以下,保水保肥能力较差。由于土壤严重缺磷、缺氮,影响稻苗根系发育和正常发棵。
The stiff seedling is a prominent issue in the production of double-season early rice. Stiff sprouts showed short plants, hair very poor, erect leaves, the top of the new leaves yellow, dead, yellow roots, red, black, very few new growth stagnation. According to our preliminary investigation, there are mainly the following aspects: 1. Soil infertility A considerable part of the early rice seedlings in our county occurred on the low-yield soils of white clay, white clay and dead loess. These soil organic matter content is very small, phosphorus is generally about six ten thousandths, nitrogen content below one thousandth, poor water retention and fertilizer. Due to serious soil phosphorus deficiency, nitrogen deficiency, rice seedling root development and normal hair trees.