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尿素是一种含氮量较高的颗粒状结晶肥料,含氮量为45—46%。由于尿素含氮量较高,同时在通常情况下,不易吸湿和结块,所以作种肥拌麦种使用,较为方便。尿素拌种后,幼苗生长健壮,根系发达,分蘖增多,表现明显的增产效果。但是,由于尿素含氮量过高(每斤尿素等于2.2斤硫酸铵,或12—13斤棉籽饼的含氮量),并含有少量的缩二脲,对幼苗和幼根生长有抑制作用。用量过大或用法不当时,不仅造成肥料浪费,往往还发生烧种和烧苗现象,使出苗期延迟,出苗率下降,造成缺苗断垅。因此,我们就如何正确使用尿素拌麦种问题进行了试验研究。
Urea is a high nitrogen content of granular crystalline fertilizer, nitrogen content of 45-46%. Due to the high nitrogen content of urea, at the same time under normal circumstances, not easy to moisture and caking, so as a kind of fat wheat mix, more convenient. After seed dressing with urea, seedlings grow robust, developed root system, increased tillers, showing obvious yield increase. However, due to the high nitrogen content of urea (2.2 kg of urea per kg of urea or 12-13 kg of cottonseed cake nitrogen content), and contains a small amount of biuret, the growth of seedlings and young root inhibition. When the dosage is too large or not properly used, not only waste of fertilizer is often caused, but also burning seeds and burning seedlings often occur, which delays seedling emergence and the emergence rate decreases, resulting in lack of seedlings. Therefore, we conducted a pilot study on how to properly use urea mixed wheat seed.