Abstract:

The South China is a major producing area of double cropping ofrice.Owing to the continuous cropping of green manure-double croppi-ng of rice carried out in a large area,soil physical-chemical properthad gone bad,secondary gley was aggravated,yields of green manureand double cropping of rice remained stagnant,insect pest and plantdiseases were serious,weeds were spread,as a result the economic eff-ect was lowered.For these reasons,the experiment was conducted in1978～1982 to change the unitary system of cont...