Effects of long-term different fertilization on labile organic carbon in red paddy soil;

A 24-year field experiment was conducted to study the effects of long-term fertilization on the soil organic carbon(SOC) and total nitrogen (TN) contents in various horizons of red paddy soil in Jinxian County of Jiangxi Province(116°20′24″N,28°15′30″E).

One of the aims of the experiment was to study soil organic carbon (SOC) distribution and storage in different size groups of micro-aggregate in surface layer (0-17cm) of red paddy soil impacted by different fertilizers.

Effects of long-term fertilization on soil organic nitrogen components in paddy soil derived from red earth;

：Based on the long-term fertilizer experiment（19 years）in paddy soil derived from red earth, the methods proposed by Jiang & Gu（1989）are adopted to study the effects of long-term fertilization on the accumulation and loss of the soil phosphorus and on the forms of soil inorganic phosphorus in paddy soil.

The rules of Mn uptake by early and late rices at different growth stages in the paddy soil derived from red earth were studied based on the long-term stationary experiment of Hunan Agriculture University.

A systematic study concerning the effects of a long term stationary fertilization on content and property of soil humus in Fluvo aquic soil sampled from Malan Farm, Xinji City, Hebei, and Arid red soil and Paddy red soil sampled from the Institute of Red Soil, Jinxian County, Jiangxi was conducted.

A long-term field experiment with the double rice and winter fallow cropping system was conducted based on the Key Field Monitoring Experimental Station for Reddish Paddy Soil Eco-environment in Wangcheng,Ministry of Agriculture,China,to study the effect of long-term application of fertilizer and rice straw on the soil N fertility and productivity in reddish paddy soil.