Effects of straw mulching to slope red soil on fertility maintaining and crop yield

The authors studied the effects of soil fertility maintainingand crop yield increase under straw mulch for five years in slope red earth insuccession. The results show as follows: the soil organic carbon and total N, Pcontent of "Straw +NP chemical fertilizer"("Straw+NP") treatment increased by 42.9%, 17.4% and 44.2% respectively than those of no chemical fertilizer(CK) treatment. It was approximately twice in the range of soil organic carbon and total N beingraised by "Straw+NP" treatment than by NPK chemical fertilizer(NPK) treatment.Compared with CK and NPK treatment, "Straw+NP" treatment can obviously improve the contents of red soil microbial biomass C, N, P, and dissolved organic C, N,Olsen-P, there are differences between fertilization treatment notability(P<0.05) or bally prominence(P<0.01). On the condition of nutrient dosage, "Straw+NP chemical fertilizer" treatment might obviously improve rape and sweet potatoyield. So, straw mulching is the most availability technique of soil fertilitymaintaining and crop yield increase in slope red soil.