四种改良剂对酸性黄壤土壤酸度和肥力的影响

针对贵州黄壤酸和瘠的特点,采用正交实验设计方法对牛粪、生物炭、磷矿粉和钾长石粉四种改良剂对黄壤酸度和氮磷钾含量的改良效果进行了探索,分析了它们对黄壤氮磷钾含量的影响。结果显示,四种改良剂不仅能有效调节黄壤酸度,将酸性黄壤改变为中性或弱碱性土壤,而且能够有效改善黄壤氮磷钾养分含量。生物炭、牛粪、磷矿粉和钾长石粉混合施用能提高土壤肥力,与原始黄壤相比,混合后土壤的有效氮提升近10倍,有效磷提高达百倍,速效钾提高9倍。通过回归分析,给出了氮磷钾养分含量与改良剂之间的关系式。

Effects of Four Soil Amendments on Improving Soil Quality and Acidity of Yellow Soils

According to the characteristics of acid condition and low fertility of yellow soils from Guizhou Province, China, the orthogonal experimental design method was used to study effects of cow manure, biochar, ground phosphorite and potassium feldspar powders on acidity and NPK values of yellow soils. Results show that the four amendments not only can efficiently improve the soil acidity, making the soils transformed from acid to neutral; but also can improve soil nutrients as well as soil fertility. Compared with original soils, available N improves about ten-fold, available P improves about 100-fold and available K improves 9-fold in mixed soils. Based on regression analysis, the functional relation between soil nutrients and amendments was also acquired.