辽宁省中北部是玉米盛产区,其单产和总产量在我省粮谷作物生产中占有举足轻重的地位。近些年来,玉米早衰现象比较普遍,它引起科研人员的注意。早衰原因比较复杂,我们认为原因之一是与土壤缺钾有关。为此特设田间试验进行观测。一、玉米缺钾症状玉米从苗期6～7叶开始,下位叶叶尖和叶缘出现犹如“镶金边”的黄化或枯焦症状,植株生育受阻;生长中后期,下位叶全部枯萎披散,失去生理功能,轻则使玉米减产,重则绝收。经诊断,上述现象系典型的缺钾症状。我们在调查中发现,在同一土壤类型的农田,尤其是播在高粱茬口上的玉米,其症状表现更为突出,造成严重减产,农民称之为“歇茬地”。 The middle and northern part of Liaoning Province is a corn-rich area, and its yield and total output occupy a decisive position in grain production in our province. In recent years, premature corn premature phenomenon is more common, it attracted the attention of researchers. The cause of premature aging is more complex, one of the reasons we think is related to potassium deficiency in the soil. For this ad hoc field trials were observed. First, the symptoms of corn potassium deficiency Seeds from 6 to 7 leaves at the seedling stage, the lower tip and leaf margin appears as if the “gold edge” of yellow or Kujiao symptoms, plant growth retardation; growth in the late, lower leaves all withered, Loss of physiological function, ranging from corn yield reduction, heavy but never take. After diagnosis, the above phenomenon is typical of potassium deficiency symptoms. In the survey, we found that the symptoms of the same type of farmland, especially corn sown on sorghum stubble, were more pronounced, resulting in serious yield cuts, which farmers call “stubble fields.”