Effect of various ethephon concentrations on flowering, yield, costs and returns of productions of four pineapple varieties
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Abstract
Yields of ETP5 [a mixture of 52% ethephon volume and urea fertilizer (12.5 ml to 400 g dissolved in 20 L water = 60 ml/sucker/time was poured on top of the sucker for one time.] x Battavia and ETP6 [a mixture of 52% ethephon volume and urea fertilizer (12.5 ml to 400 g dissolved in 20 L water = 60 ml/sucker/time) was poured on the top of the sucker for two times; 5 days interval.] x Phechaburi1 were higher than the other varieties, mainly due to the highest fruit weight and fruit height. Because of the significantly higher fruit weight and fruit height, ETP5 and ETP6 yielded significantly higher than the rest of the varieties. Batavia gave the significantly highest yield, fruit weight, and fruit height; followed by Phechaburi 1, Phuket, and MD2, respectively. The total cost of production under the six ethephon concentration levels applied was similar; but benefits derived from each concentration levels were noticeably different due to the different yields obtained. The best concentration level was ETP6 as it gained the highest returns.
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