nitrogen fraction 第1页

Profile distribution characteristics of soil organic nitrogen fractions in the lower reaches of the Heihe River wetland Combined application of chemical and organic fertilizers long-term increase physical proteetion of organic nitrogen in yellow paddy soil Changes of nitrogen fractions in horse dung during its decomposition on the typical steppe of Inner Mongolia, North China. Effects of desiccation of soil samples on easily mineralizing nitrogen Long-term effects of mineral versus organic fertilizers on soil labile nitrogen fractions and soil enzyme activities in agricultural soil Organic C and N in Various Surface Mineral Soil Fractions in the Broadleaved Korean Pine Mixed Forests in Changbai Mt.