|Up a level|
Abdurahman, M D S (1996) Organic matter and nitrogen returns to soil by different cropping systems rotations on a vertisol in the Indian semi-arid tropics. PhD thesis, Acharya N G Ranga Agricultural University.
Abdurahman, M D S (1991) Crop phenology and productivity of upland rice/legume intercropping systems. Masters thesis, Andhra Pradesh Agricultural University, Rajenedra Nagar.