论文部分内容阅读
１苗期病害当苗床中施用发酵不充分的有机肥而且数量较多时，铵态氮转变成亚硝态氮，根系受到亚硝酸的损害，有时还可引起缺铁症，即中心叶发黄、幼苗根数少。铵态氮过多也会引起幼苗嫩叶皱缩。２叶片病害当所施的肥料不足或过剩均会导致各种症状。施用过多的铵态氮肥料，会产?
A seedling disease When the fermentation of seedlings in the application of insufficient organic fertilizer and a large number of ammonium nitrogen into nitrite nitrogen, nitric acid damage by the root system, and sometimes can cause iron deficiency, that is, the central leaf yellow, Small number of seedlings. Too much ammonium nitrogen also causes young leaves to shrink. 2 leaf disease when the fertilizer is insufficient or excess will lead to a variety of symptoms. Apply too much ammonium nitrogen fertilizer, will produce?