Effect of irrigation frequencies and water amounts on growth and yield of sweet sorghum | เธเธฅเธเธญเธเธเธงเธฒเธกเธเธตเนเธเธญเธเธเธฒเธฃเนเธซเนเธเนเธณเนเธฅเธฐเธเธฃเธดเธกเธฒเธเธเนเธณเธเธตเนเธกเธตเธเนเธญเธเธฒเธฃเนเธเธฃเธดเธเนเธเธดเธเนเธเนเธฅเธฐเธเธฅเธเธฅเธดเธเธเธญเธเธเนเธฒเธงเธเนเธฒเธเธซเธงเธฒเธ
2008
Watcharapong Vannavong(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Department of Plant Production Technology) E-mail:[email protected] | Somyot Detpiratmongkol(King Mongkut's Institute of Technology Ladkrabang, Bangkok (Thailand). Faculty of Agricultural Technology. Department of Plant Production Technology)
Irrigation water is always needed for production of high yielding crops. Thus, the objective of this study was to determine the effects of irrigation frequencies and water amounts on growth and yield of sweet sorghum. A split-split plot in RCBD with three replications was employed. Two sweet sorghum cultivars, Rio and Killer, were main plots. Three irrigation frequencies (e.i. every 3, 7 and 15 days) and three different water amounts (e.i. 10, 20 and 30 mm of water equivalent to rainfall) were sub-plots and sub-sub plots, respectively. The results revealed that Rio cultivar had greater plant height, stem dry weight and stem fresh weight yield than Killer cultivar. Water irrigation had direct effect on growth and yield of sweet sorghum. Sweet sorghum grown under the most frequent irrigation (every 3 days) and the greatest water amount (30 mm) gave the highest plant height, stem dry weight and stem fresh weight yield whereas those under the least irrigation frequency (every 15 days) and fewest water amount (10 mm) gave the lowest. The lowest irrigation frequency and water amount reduced transpiration rate, relative water content and total conductance but increased leaf temperature. However, there were no interaction among sweet sorghum cultivars, irrigation frequencies and water amounts.
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