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1984年,我县直播油菜苗期出现缺锌失绿症,对产量影响很大,现将油菜缺锌症状和施锌效果介绍如下: 一、油菜缺锌症状“宁油8号”失绿白化症状始于4叶期,5至6叶期全田发病,较严重田块病苗占总苗数85.6%。(一)苗期症状:新叶全展即可表现症状,首先从叶缘开始,叶色褪淡变灰白色,而后不断向叶片中间发展,叶肉呈黄白色的不规则病斑,病斑无坏死,无菌丝,叶脉两侧仍保持绿色;病叶叶缘不表现绉缩,中下
In 1984, the county live rapeseed zinc deficiency chlorosis at seedling stage, a great impact on the yield, now rape zinc deficiency symptoms and zinc effects are described below: First, the rape zinc deficiency symptoms “Ningyou 8” green albino Symptoms began in the 4-leaf stage, 5 to 6 leaves of the whole field of disease, the more serious terbium seedlings accounted for 85.6% of the total number of seedlings. (A) the symptoms of seedling: the new leaf can show the symptoms of the whole show, starting from the leaf margin, the leaf color faded pale gray, and then continue to the leaves of the middle development, leaf yellowish white irregular spots, lesions necrosis , No asepsis, veins remain on both sides of the green; diseased leaf margin did not show shrinking, middle and lower