论文部分内容阅读
云南省玉溪、罗平、楚雄等地随着烤烟良种 G-28在生产上的大面积推广种植,该品种中上部叶片屡有缺镁症出现。缺镁烟叶初烤后呈暗无光泽的淡棕色,叶片薄,无弹性,烟叶产质降低。为了搞清哪些因素与缺镁症的发生有关,笔者于1983年8-9月对楚雄的几块烤烟试验田进行了烟株缺镁情况的初步调查,认为烤烟缺镁症与品种、密度、施肥量和留叶数等因素有一定的关系,现将调查结果整理如下,以供参考。 1、烤烟缺镁症出现的时期和症状调查烟田的烟株缺镁症多发生在打顶后的8月中下旬至9月上旬。此时脚叶和下二棚已
Yunnan Yuxi, Luoping, Chuxiong and other places with the flue-cured tobacco varieties G-28 in the production of large-scale promotion of cultivation, the varieties of the upper leaves Magnesium often appear. Lack of magnesium leaves after the beginning of the dark matte light brown, thin leaves, inelastic, reduce tobacco yield. In order to find out what factors are related to the occurrence of magnesium deficiency disease, the author conducted a preliminary investigation of the deficiency of magnesium in tobacco plants from August to September 1983 in a few flue-cured tobacco experimental plots. The results showed that magnesium deficiency and disease, Quantity and the number of leaves and other factors have a certain relationship, the survey results are summarized below, for reference. 1, flue-cured magnesium deficiency appeared during the period and symptoms Tobacco tobacco plants magnesium deficiency occurred in the top to late August to early September. At this time the foot leaves and the second shed has been