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Asian Journal of Agricultural Research
  Year: 2011 | Volume: 5 | Issue: 6 | Page No.: 300-305
DOI: 10.3923/ajar.2011.300.305
 
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The Effect of Defoliation on the Quality of Sweet Potato Tubers

Isaac Gibberson Dukuh

Abstract:
Sweet potato (Ipomoea batatas L.) is the seventh most important food crop. In the tropics it is a staple food in many developing countries and it also serves as animal feed and raw material for many industries. The utilization of sweet potato in many countries has declined which can partly be due to pre and post-harvest losses resulting in excessive waste which has increased prices. The study was conducted to determine the effect of time of pre-harvest defoliation of sweet potato vines on yield performance and quality of sweetpotato and tuberpotato in the Coastal savanna of Ghana. To do this the effect of defoliation and variety on the quality of tubers were studied. Two improved varieties; TIS 86-3017 and TIS 8266 and a local variety, Cape Coast, were subjected to pre-harvest defoliation period of 12, 8 and 4 days before harvesting. A fourth treatment was without defoliation and was designated 0 that is no defoliation. The experiment examined the effect of genotypes and defoliation on tuber quality. The experiment revealed that the improved varieties were no better than the local variety in their yields, resistance to fungal decay and extent of rodent attack. The improved varieties were more susceptible to Cylas weevil infestation in the field than the local variety. The improved varieties suffered more damaged during harvesting and sprouted more in the field than the local variety. Defoliation before harvesting reduced weevil infestation, fungal decay and bruising of tubers during harvesting and handling. However, defoliation increased sprouting of tubers from 2.5% for tubers which were not defoliated to 14.2% in tubers which were defoliated 12 days before harvesting.
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How to cite this article:

Isaac Gibberson Dukuh , 2011. The Effect of Defoliation on the Quality of Sweet Potato Tubers. Asian Journal of Agricultural Research, 5: 300-305.

DOI: 10.3923/ajar.2011.300.305

URL: https://scialert.net/abstract/?doi=ajar.2011.300.305

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