1.The A1-P and Fe-P were the second resource. The Ca10-P and Ca8-P were the phosphor depository of the Grey desert soil promoting the transform from the CalO-P and Ca8-P to the Ca2-P was the key factor pf raising the supplying phosphor capability of the Grey desert soil.
2.The proper amount of N, P2O5 and K2O applying on the Grey Desert Soil is N = 191.07kg/ hm2, P2O5 = 120.00kg/hm2, K2O = 45.27kg/hm2.lt shall obtain the highest yield.
3.For example, the critical value of soil Ca was 920 mg/kg as CaCl_2 was applied to the winter Chinese cabbage in the brown-grey alluvial paddy soil and became 950 mg/kg in the grey alluvial paddy soil.
5.So the DCD was applied at various concentrations in different soils. The concentration of DCD mixed with AB was 0.5% in Purple soil, and it was 0.3% in Grey alluvial and Yellow soil.
7.Grey theory is employed in the prediction of soil erosion rate, and a computer program is written in VC++6.0 language to ease the calculation of soil erosion rate.
10.Solution culture experiments on effects of humus (Fulvic acid, Brown humic acid, Grey humic acid) on the plant activity of mineral bound Hg (CaCO3-Hg, Fe2O3-Hg, MnO2-Hg, bentonite-Hg and kaolinite-Hg) were carried out; and soil was used in confirmed test.
