露天韭菜黄尖有什么 好的办法可以避免或用什么药可以治好

越详细越好》急需
2025-03-16 07:21:23
推荐回答(3个)
回答1:

露天韭菜黄尖解决方法:
1、注意要在扣棚前用药,并且控制最佳用药量,避开韭菜出芽时间,以免韭菜幼芽受到药剂伤害。
2、尿素的使用量应控制在12公斤以下。另外多施有机肥或腐殖酸类肥料,以促根养根为主,提高韭菜长势。
3、硝态氮肥尽量少施或不施用。
露天韭菜黄尖发生原因有:
1、药害初冬发芽期用药量浓度过大,易导致叶片干尖。
2、尿素、硝态氮等使用过多每亩地使用尿素的最大限量是12公斤左右,如果在拱棚韭菜地尿素使用量过大,很容易引起氨气损伤叶片;硝态氮和铵态氮用量过多,容易引起亚硝酸损伤,使叶片黄尖、干尖。可以使用PH试纸检测露水酸碱性来确定。
3、放风过大在棚内温度较高的情况下,如果突然开大放风口,可能会导致叶片干尖、叶尖发黄。

4、与品种特性有关。雪韭、小根红、汉中冬韭等品种夏秋季容易产生干尖现象,但是冬季保护地栽培不会出现这种情况。

回答2:

夏天高温时露天种植的韭菜黄尖是蒸腾作用大时韭菜自我保护的表现,很正常,一般不用管的。

回答3:

黄尖是缺少某种物质......具体是什么........我不知道哦...

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