红壤旱地钾、镁肥肥效及其平衡施用对玉米产量的影响

Effects of Potassium?Megnesium Fertilizer and their balanced Fertilization on Corn Yield in Upland Soil of Red Earth

就红壤旱地钾、镁肥及其平衡施用对玉米产量的影响进行了试验,结果表明,湘南酸性红壤中钾、镁均以难溶态为主,有效态相对较少,不能满足作物生长的需要;玉米单施钾、镁增产显著,钾、镁配施增产更大,尤其在钾、镁最佳用量时配施效果最好。因此,在湘南酸性红壤上钾、镁平衡施用,可大幅度提高玉米产量。

Soil analysis shows that K and Mg in acid red soil in South Hunan exist mainly in the ineffective type;their cootents in the effective type are too low to crop growth. Single application of K or Mg can increase the corn yield markedly;and their (compounding) (application) can obtain the higher yield, especially in the optimum ratio. Therefore, to obtain the higher yield in red soil in South Hunan, balanced application of K and Mg should be used.