龙岩市水稻土镁素状况及镁肥肥效的研究

通过 4 2 0个水稻土耕层土样测定 ,龙岩市水稻土代换性镁平均含量为 0 37cmol·kg-1,土壤镁素普遍缺乏 ,以潮沙田尤为严重。从地区分布情况看 ,土壤代换性镁呈从西到东、由北向南逐渐递增的趋势 ,在土壤剖面中则有向下层移动富集的趋势。经回归分析 ,土壤代换性镁含量与pH值呈极显著的正相关。在水稻土上施用镁肥 ,可矫治水稻缺镁黄化病 ,显著提高产量

Studies on the contents of Mg in paddy soils and application effect of Mg fertilizer in Long Yan city

The 420 paddy soils samples of cultivated horizon from Long Yan city were analysed. The results were as follows:The mean contents of exchangeable Mg were 0.37cmol/kg. The exchangeable Mg in paddy soils were rather scarce and that in tide sand paddy soils were more scarce than that in other paddy soils. The contents of exchangeable Mg were increased gradually from west to east and north to south in Long Yan city and that were accumulated in low horizon of paddy soils. The regression analysis revealcd that positive correlation between the contents of exchangeable Mg and pH were of great signiticance. The yickl of rice was increased evidently and the yellow disease of rice lacking Mg were corrccted through application Mg fertilizer in paddy soils.