盐池扬黄灌区甘草土壤养分丰缺初步研究

Preliminary Study of Abundance and Deficiency of Soil Nutrient of Glycyrrhiza L. in Yellow River Pumping Irrigation Area of Yanchi County

盐池扬黄灌区土壤养分丰缺指标的研究结果初步表明:盐池扬黄新灌区灰钙土土壤基础肥力对甘草产量所起的作用为47.8%,对移栽前基施化肥的依赖程度为52.2%。土壤基础肥力对甘草产量形成的贡献大于移栽前基施于土壤中的肥料,地愈肥作用愈大。在土壤氮、磷、钾三大营养元素中,缺氮区相对产量为65.4%,土壤的丰缺类型为缺;缺磷区相对产量为66.9%,土壤的丰缺类型为中等偏少;缺钾区相对产量为74.3%,土壤的丰缺类型为中等偏少。

The result of a study of the abundance and deficiency indices of the soil nutrient in the Yellow River pumping irrigation area of Yanchi county showed that the effect of the basic fertility of the sierozem soil in Yellow River pumping ir- rigation area of Yanchi county on the yield of Glycyrrhiza L. was 47.8%. The dependency level on base fertilizer before transplanting was 52.2%. The contribution of the soil basic fertility to the formation of the yield of soil fertility was larger than that of the base fertilizer before transplanting and the more fertility the soil was the lager the contribution was. As for the three soil nutrient elements N, P, K, in the nitrogen deficiency area the fractional yield was 65.4% and the abundance and deficiency type of the soil nutrient was deficiency; in the phosphorus deficiency area the fractional yield was 66.9% and the abundance and deficiency type of the soil nutrient was medium small; in the potassium deficiency area the fractional yield was 74.3% and the abundance and deficiency type of the soil nutrient was medium small.