fixed ammonium 第1页

The different characteristics of soil fixed ammonium from south to north on the Loess Plateau Nitrogen transformation and its residue in pot experiments amended with organic and inorganic 15N cross labeled fertilizers Seasonal variation of fixed ammonium content of paddy soils in Hunan Province and its bioavailability Fixed ammonium content of chief paddy soil types in Hunan Province and its influencing factors NITROGEN SUPPLY POTENTIALITY OF UPLAND SOILS