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随着农业生产的发展和单产的提高,土壤有效锌的含量日趋下降,对锌敏感的玉米等作物已出现生理病害。近年来,我们结合土壤普查,对全县不同土壤的有效锌含量进行了调查,初步证实我县土壤有效锌含量比较缺乏,含量范围大致在0.32—2.16ppm间,缺锌(速效锌在1ppm,特别是在0.5ppm以下)面积占全县总耕地71.6％,适量和丰富(在1—2ppm以上)面积占28.4％,全县平均约为0.80ppm,低于1ppm的临界指标。针对全县土壤缺锌的问题,1978年以来,我们以玉米为指示作物,连续几年进行
With the development of agricultural production and the improvement of yield, the content of available zinc in soil is declining day by day, and physiological diseases such as corn sensitive to zinc have emerged. In recent years, we combined with soil census, the effective zinc content of different soils in the county were investigated, initially confirmed that the county of soil less available zinc, the content range of roughly 0.32-2.16ppm, zinc deficiency (available zinc in 1ppm, Especially below 0.5ppm) accounts for 71.6% of the total cultivated land of the county, and the area of moderate and abundant (above 1-2ppm) accounts for 28.4%. The county has an average of about 0.80ppm and a critical index below 1ppm. In view of the problem of zinc deficiency in the whole county, since 1978, we have used corn as the indicator crop for several years in a row