), grass-grass-grass-KM10 (G-G-G-KM10), grass-grass-grass-RK8 (G-G-G-RK8), KM10-Crotalaria  juncea (KM10-Cr) and RK8-Crotalaria …, Zimbabwe. Soil samples were taken from 0- to 15-cm deep, after each season.  After 9 years, tobacco-grass rotations showed … P was lower in the grass (G-G-G-KM10, G-G-G-RK8) relative to the other rotations regardless of variety.  Available P …

phosphorous emissions (22 %), and diffuse sources for nitrogen via erosion (15 %) and free grazing (12 %) and for phosphorous via … need different lumped parameterization in MONERIS simulation. Point sources are important for nitrogen (64 %) and …

inhibition of the nitrification process in soil (conversion of ammonium to nitrate) with possible benefits for improved nitrogen … practices including inter-cropping, inclusion of nitrogen-fixing crops, agroforestry and improved recycling have been clearly … sufficient nitrogen is available for adequate food production. Application of known strategies (through either regulation or …

coverage includes nitrogen (N), phosphorous (P), and potassium (K). In this report we present the data and procedures used to …

-maximizing nitrogen rates, yields, and net returns for corn grown after corn, cotton, and soybeans. The stochastic response functions were … best. The profit-maximizing nitrogen rates were similar for corn after corn, cotton, and soybeans, but relative to corn …