The experiments were carried out to study effects of different cultivation patterns on the soil unit weight, soil aggregate,pH, soil organic, total N, alkali-hydrolysis N, available P, available K and rice yield in rice-carb culture system. Four treatments were designed, including. one seeding per hill in rice-carb, two seeding per hill in rice-carb, four seeding per hill in rice-carb, and two seeding per hill in rice. Compared with conventional paddy fields, rice-carb paddy fields could reduce soil aggregate, increase the number of larger aggregates(>0.2 mm), reduce the content of smaller aggregates(<0.002 mm)significantly, improve soil aggregates level, and adjust the soil pH value to 7, increase soil organic significantly, the soil total N content were not significantly affected, while soil alkalihydrolysis
N, available P, available K were improved at mature stage. Different cultivation patterns had not significantly affect on the soil physical and chemical properties and nutrition. Rice-carb paddy fields yield was higher than conventional rice, whereas, there were not significantl affect in different treatments rice yield in rice-carb paddy fields, but four seedings per hill for the rice yield was highest. |