1. Introduction
Bio-ethanol from sweet potato (Ipomoea batatas) is widely producing as socu an alcoholic beverage in Japan.
The demand of bio-ethanol as renewable fuel in line with ecologically friendly energy, promotes sweet potato to be
more important. Unlike cereals and grain legumes that yield is clearly located aboveground, while sweet potato and
other root & tuber crops its tuberous root yield is underground. As consequence yield level is recognized after
harvest. Digging out the tuberous root is the only way for harvesting; that corollary to the whole part of plant is
removed out from the field. Very few of plant part are return back to the soil for maintaining sustainability.
Therefore, sustaining sweet potato production system is a huge challenge. According to reference1 sweet potato, in
nature, is a perennial plant (36 mo) due to human domestication it is cultivated as an annual crop (3.5 to 8) mo. In
Indonesia, as tropical zone, sweet potato can be planted in many kinds of environment and climate. From Sabang
Island in the north of Sumatra till Merauke in the south part of Papua, sweet potato can be easily found as one of
food crop planted by farmers. The wide range adaptability of sweet potato under different altitudes, soil types and its
fertility levels and relatively requires an inexpensive input, less pest and disease therefore sweet potato is preferred
by people for providing their own food consumption; for complementing feed stuff and supplying raw material of
industrial enterprise2,
1. IntroductionBio-ethanol from sweet potato (Ipomoea batatas) is widely producing as socu an alcoholic beverage in Japan.The demand of bio-ethanol as renewable fuel in line with ecologically friendly energy, promotes sweet potato to bemore important. Unlike cereals and grain legumes that yield is clearly located aboveground, while sweet potato andother root & tuber crops its tuberous root yield is underground. As consequence yield level is recognized afterharvest. Digging out the tuberous root is the only way for harvesting; that corollary to the whole part of plant isremoved out from the field. Very few of plant part are return back to the soil for maintaining sustainability.Therefore, sustaining sweet potato production system is a huge challenge. According to reference1 sweet potato, innature, is a perennial plant (36 mo) due to human domestication it is cultivated as an annual crop (3.5 to 8) mo. InIndonesia, as tropical zone, sweet potato can be planted in many kinds of environment and climate. From SabangIsland in the north of Sumatra till Merauke in the south part of Papua, sweet potato can be easily found as one offood crop planted by farmers. The wide range adaptability of sweet potato under different altitudes, soil types and itsfertility levels and relatively requires an inexpensive input, less pest and disease therefore sweet potato is preferredby people for providing their own food consumption; for complementing feed stuff and supplying raw material ofindustrial enterprise2,
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