exchangeable Ca 第1页

The contents of exchangeable calcium and magnesium in Hunan tobacco-growing soils and their effects on tobacco quality Effect of long-term plastic film mulching and fertilization on exchangeable calcium and magnesium contents in brown earth EFFECT OF A LARlX PRlNCIPlS-RUPPRECHTII FOREST PLANTATION ON SOIL IN MIDDLE ZONE OF SOUTH—FACING SLOPE OF THE QINLING MOUNTAINS Cation exchange capacity and exchangeable cations amount of Micae Lapis Aureus before and after processing Cation exchange capacity and exchangeable cations amount of Micae Lapis Aureus before and after processing Comparative Studies on the Temporal and Spatial Distribution of Calcium in Leymus chinensis Community and Chloris virgata Community In The Song-Nen Plain China