The changes of nutrient balances driven by adjusting crop structure at county level during 25 years——A case study in Huimin County,Shandong Province;

Yield of inbred rice and hybrid rice and soil nutrient balance under long-term fertilization;

Competition and nutrient balance in the compound operational system for the dry slopeland in the valleyland area of Jinsha River;

Study on nutrients balance of farming ecosystem in typical areas of Shaanxi Province;

The farmland nutrients balance and the dynamic changing tendency of soil nutrients were discussed during nearly 20 years (from 1981 to 1999) in three subecosystems zone of the hill of Sichuan basin.

Research of nutrients balance in farmland can help looking into thevariety and problem possibly appeared in process of farmland nutrients degenerate andregenerate from macro angle.

Influence of different drainage conditions on soil erosion and nutrient loss of slope land;

Research on the nutrient loss from purple soil under differentrainfall intensities and slopes;

A study on the effect of the Vetiver zizanioides contour hedgerow on the soil and nutrient loss control;

Based on the observation in runoff plots in the western hills of Sichuan Province in 2003, the feature of runoff, sediment yield and the nutrient losses in different patterns of forest (bamboo)-grass compound management were analyzed.

More importantly, features of surface runoff and sediment yield, nutrient losses and factors which influenced these features were discussed.