The effect of rape and preceding crops on agrochemical properties of dernopodzolic gleyed soil

摘要

In field trials conducted between 1989 and 1991 in the Central Lithuanian Plain, the effects of winter or spring rape and their immediately preceding crops (potatoes, clover, vetch+oats, winter wheat, barley, winter rape or spring rape) on properties of gleyed dernopodzolic light loam soil were investigated. For winter rape, soil organic matter contents (SOMC) were greatest (3.3%) after cultivation of clover. For spring rape, SOMC were greatest (3.2%) after cultivation of winter rape. SOMC after winter rape were similar to SOMC after its preceding crops. SOMC after spring rape were 0.4-0.5% less than SOMC after its preceding crops. Nutrient uptake by winter rape was greater than spring rape. For crops preceding winter rape, contents of mineral N in soil were greatest after vetch+oats and spring rape, and lowest after clover. For crops preceding winter rape, contents of S in soil were greatest after winter or spring rape.