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前年春天,我社北董家大队果园有6棵苹果树,由于追施氨水浓度过高(1斤氨水兑水4斤)引起了肥害。其症状表现是:果树刚刚展叶,幼嫩的叶片就开始干边、发白,以后逐渐发黄、干枯;新梢干瘪;根部黑褐色,水烫状;受害一侧的树干韧皮部有粗细不等的黑线直通主枝,致使整个主枝衰弱,严重者几乎枯死。为了控制肥害,恢复树势,他们采取了断根、环剥、浇水三条措施,效果很好。一、断根:对受害严重的主枝,
The year before last spring, our club North Dong Brigade orchard has 6 apple trees, due to the pursuit of ammonia concentration is too high (1 kg of ammonia watered 4 kg) caused fat. The symptoms are: fruit trees just leaf, young leaves began to dry, white, yellow gradually afterwards, withered; shoots shriveled; root dark brown, hot water; victim side of the trunk phloem thickness Such as the black line through the main branch, resulting in weakness throughout the main branch, in severe cases almost dead. In order to control the fertilizer damage and restore the tree vigor, they took three measures: cutting roots, girdling and watering, and the results were very good. First, cut the root: the victim of a serious branch,