K326) experiment was carried out to obtain the strategies for optimizing nitrogen management based on study of the transformation of soil NO_3~--N and NH_4~+-N, growth and yield, N and K absorption, nicotine content of flue-cured tobacoo, in comparison with different formation of fertilizer N in paddy soil and dry land soil during both successive growing seasons from Mar.

Effects of fertilization on the potential of methane oxidation in upland soil;

Available P, K, Fe, Mn, Cu, Zn, Ca and Mg of some upland soils in Hubei province were determined by both ASI and routine methods.

The distribution pattern of fixed ammonium and maximum capacity of ammonium fixation in the profiles of several cultivated upland soils and paddy soils in Hunan province,China,and their influencing factors were studied with sampling on fields,and laboratory incubation and determination.

Effects of soil-surface mulching on organic carbon,inorganic carbon and light fraction organic carbon in dryland soil

Although the averaged P sorption maxima of upland soils derived from Langmuir sorption plot was a little higher than that of paddy soils the potential of P loss from upland soils to waterbodies was greater because upland soils usually had a much higher P level.

The nitrogen leaching loss from the soils in dry land at different depths (20, 40 and 60 cm) of columns was studied.