About FARINA M P W
About Grain Crops Research Inst., Pietermaritzburg, ZAF
About CHANNON P
About Grain Crops Research Inst., Pietermaritzburg, ZAF
About Plant and Soil
About Zea mays
About exchange acidity
About Corns
About Fertilizer application and efficiency
About Soil chemistry
About トウモロコシ
About 石灰
About 指数
About 圃場