Clement G. Sales and Reynaldo R. Javier
Green manure did not cause any significant effect on most of the yield and yield components of sweet potato variety BNAS-51; a significant decrease in the number of non-marketable tubers was observed. Highly significant differences among fertilizer treatments were obtained for yields of marketable tubers, total tuber yields, and fresh and dry weights of vines, but not for the number of marketable and non-marketable tubers, total number of tubers per plot, and harvest index of sweet potato. The response of tuber and vine yields was attributed to N application. Higher tuber and sine yields were obtained when 40 kg of N with 30 to 60 kg of P and K were applied.
Annals of Tropical Research 2 (4):(1980)