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Q:四倍体刺槐发生黄化病的起因是什么?A:四倍体刺槐在长到50厘米时,进入旺盛生长期。此时,在部分种植地区会发现部分叶片失绿、变黄、脱落,而且进展速度很快,如不抓紧控制,会影响苗木的正常发育,甚至部分苗木会因此干枯而死。我们称上述症状为黄化病。造成黄化病的原因大致有如下几种:A、土壤质地粘重、板结,通气与排水不畅,影响该品种根系呼吸。B、土壤 pH 值高于7.5的地区,铁和其他营养元素不易被溶解,加之由于其他客观因素造成的土壤返碱现象,会诱发黄化病。C、过量施入氮肥,
Q: What are the causes of yellowing disease in tetraploid black locusts? A: When tetraploid black locusts grow to 50 centimeters, they have entered a vigorous growth phase. At this time, some of the planting areas will find some of the leaves turn green, yellow, fall off, and the rate of progress is very fast. If they are not properly controlled, they will affect the normal development of seedlings and even some seedlings will die dry. We call the above symptoms yellowing disease. The causes of yellow disease are generally the following categories: A, soil texture sticky, compaction, ventilation and poor drainage, affecting the variety of root respiration. B, where soil pH is above 7.5, iron and other nutrients are not easily dissolved, and yellowing is induced by soil back-sizing due to other objective factors. C, excessive nitrogen fertilizer,