Effect of yacon leaf as organic fertilizer on the yield and mineral element content of yacon (Polynnia sonchifolia)
2005
Yoshida, M. (Ibaraki Univ., Ami (Japan). Coll. of Agriculture) | Torres, F.A.
Yacon (Polymnia sonchifolia) is recognized as a non-starchy Andean root crop. Yacon is originally grown in many of the Andes countries and is cultivated on slopes of the Peruvian Andes. The yacon cultivation without chemical fertilizers was known to promise no less production in the Andes areas. The yacon leaves contained high content of mineral compounds and nitrogen. The yacon leaf was considered to be highly useful as a green manure for yacon production. The effects of yacon leaf application as an organic fertilizer on the growth, quality and productivity of yacon tubers and leaves were discussed. The tuber yield, plant height, tuber weight/plant and tuber number/plant of yacon produced in an organic fertilizer (yacon leaf) treatment were observed to be little less than these values of yacon produced in inorganic fertilizer (N, P, K) treatment in the 1st cropping (2001) and the 2nd cropping (2002) seasons. A large amount (49% to 57% of total biomass) of yacon leaves were produced in yacon leaf application treatment. The contents of N, P and K in the leaves were higher than those in tubers. The contents of N, P and K in the leaves produced in yacon leaf application treatment were higher than those in leaves in inorganic fertilizer (N, P, K) treatment. The microelements (Zn, Cu, Fe and Mn) were higher in leaves than in tubers. The result indicates that application of yacon leaf as an organic fertilizer can be useful for yacon cultivation.
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