Effects of Harvesting Management on Nutritive Values and Yielding of Cassava Foliage and Tuber

Yin Yin Kyawt, Min Aung, Yasuhiro Kawamoto

Abstract


The experiment was conducted to determine the effect of different harvesting period on the chemical composition and yielding of cassava (foliage and tuber). Two different ages of cassava foliage of initial harvesting, at 3 and 5 months were conducted for IH3 + FH and IH5 + FH treatments, respectively. The final harvests of these two treatments were done the whole including tuber in the 7 month. Cassava foliage, harvested once at root harvest (7 month), was performed as a control treatment (FH). The lowest hydrocyanic acid potential (HCNp) content was observed at control treatment in both cassava foliage and tuber while IH3 + FH treatment showed the highest HCNp content. The HCNp and crude protein (CP) content were higher in the leave compared with petiole and stem of foliage while these compositions were also higher in cortex than parenchyma portion of cassava tuber. The opposite trend was found in the crude fiber (CF) contents, which were higher in the petiole and stem than the leaves. The highest total foliage and protein yield were observed at IH5 + FH treatment compared with IH3 + FH and FH. FH treatment produced the highest tuber yield (15268 kg/ha), followed by IH5 + FH (11567 kg/ha) in this experiment. The leaves and tuber contain gross energy with an average of 4709 kcal/kg (range: 4608-4783 kcal/kg) and 3857 kcal/kg (range: 3842-3881 kcal/kg), respectively. Viewing both yield and proximate analytical values, the IH5 + FH treatment gives the highest foliage yield together with the high CP and low fiber content in both harvest periods.


Keywords


Cassava, Crude protein, Energy, Cyanide, Yield

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References


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