INVESTIGATION OF THE DECOMPOSITION PATTERN OF CORN STRAW IN COLD LAND UNDER DIFFERENT FIELD RETURN METHODS

In order to explore the best parameters for the decomposition of corn straw for return to the field under extremely cold temperature conditions in northeast China, an orthogonal test was used to test the decomposition of corn straw and to analyse the effects of factors such as straw return depth, straw return amount, straw stalk part and decomposer concentration on the decomposition efficiency of corn straw. The results showed that the most significant effect on the decomposition efficiency of cold land corn straw was the amount of straw returned to the field, followed by the concentration of decomposer and the depth of straw returned to the field, and the least effect was the straw part. Among them, the amount of straw returned to the field showed a negative correlation on the decomposition efficiency of cold land corn straw; the concentration of decomposer, the depth of straw returned to the field and the straw part showed a positive correlation on the decomposition efficiency of cold land corn straw.