摘要
研究了银北4种主要土壤对磷的吸附特性.结果:4种土壤的实测吸附曲线与Freundlich、Lanemuir和Femkin3种等温吸附方程吻合,相关极显著,又以Langmuir等温吸附方程最为吻合;银北土壤对磷的最大吸附量(X_m)在297～654μg/g之间,平均为433.8±42.8μg/g,较银南的大,为较强供磷能力的土壤;4种土壤的最大吸磷量与物理性粘粒、CaCO_3、CEC的大小呈显著正相关,而与pH、有机质、有效磷相关不显著;土壤的解吸磷与吸附磷量呈直线正相关,吸磷量大的解吸量也大;根据研究所得等温吸附曲线预测银北土壤的施磷量比银南的高,且与实践相符.
The characteristics of phosphorus (P) absorption by 4 kinds of soils in northern Yinchuan were studied. The results indicated that:The absorption curves of soil for trail were identical with three(Freu-ndlich-type,Langmuir type and Temkintype)isotherm absorption equation (IAE),and correlated with them respectively. The Langmuir-type equation most perfectly agreed with the curves; The paper pointed out that the soils in northern Ningxia have stronger ability in supplying P, as well as absorbing P, with maximum P absorption (MPA) of 297-654ug/g, average P absorption(MPA)of 433.8±42.8ug/g;MPA was positively significant corre-lated with soil physical clay, its content of CaCO_3 and CEC; Correlation with PH, organic matter, available P was not evident. P absorption was found directly correlated with P desorption. According to the IAE, we predict the application of phosphatic fertilizer was higher in northern Yinchuan than that in southern Yinchuan.
出处
《宁夏农林科技》
1993年第4期17-21,共5页
Journal of Ningxia Agriculture and Forestry Science and Technology
