施石灰石粉后红壤化学性质的变化

红壤施用石灰１０年的田间试验和盆栽试验的结果表明施用石灰能降低土壤酸度，增加土壤中效换性Ｃａ和Ｍｇ含量，从而导致作物产量的提高；底土酸度的降低随时间的推移和石灰用量的增大而增强，每倾施用３．２５－１５．０吨石灰石粉的降酸和增产效应至少可维持１０年以上。

CHANGES IN CHEMICAL PROPERTIES OF RED SOIL AFTER SURFACE APPLICATION OF POWDERED LIMESTONE

The results of a 10-year liming field experiment and pot experiment indicated that(1)the reduction in the soil acidity and the increase in the contents of exchangeable Ca and Mg after application of powdered limestone resulted in the yield increase of green grain; (2) the reduction in soil acidity of the subsoil increased as the time of application of powdered limestone prolonged and lime rate increased, the effects of reducing soil acidity and increasing the yields of the crops could last at least 10 years; (3) the treatment with 7.5 t/ha powdered limestone significantly increased the contents of organic matter, total N, and available P; (4) the contents of available Zn and Cu of the soil increased as the pH increased and were significantly related to organic matter content of the soil, those correlation coeffioients were 0.965^** (n=5) and 0.887^** (n=5), respectively; (5) the contents of organic matter available Zn, and available Cu decreased with the increase of soil depth and (6) for red soil deficient in P, application of lime in combination with phosphorus fertilizer had an even better effect on the yield increase of soybeams.