Flowering and some physiological changes of rambutan (Nephelium lappaceum L.) cv. Rong Rian as affected by irrigation regimes
1993
Chaiwat Makhonpas
System of under-tree polyethylene tent cover was used in conjunction with irrigation treatments to induce a range of soil moisture regimes for flowering induction in rambutan the cv. Rong Rian. The treatment included drought periods for 35, 45 and 50 days at the end of rainy season in 1991 follow by irrigation rate of 25 or 50 litres/tree/day at 5 days interval until flower emergence. The experiment was conducted at an orchard in Tambol Phluang, Amphoe Makham, Chanthaburi province on 5 years old rambutan trees. After the drought periods, soil water potential reduced to -65 to -70 kPa, which could induced flower initiation earlier. The best results in flower induction was 35 days drought period follow by irrigation at the rate of 50 litres/tree/day, which showed flower bud initiation and emergence in 35 and 48.5 days respectively, from the first day of drought period, compaired with 52.5 and 62 days in control. Eventhough, the drought period at 45 days showed higher percentage of flowering. Percent of fruit set, number of fruit/bunch and yield tended to be improve by the irrigation rate of 50 litres/tree/day at 5 days interval before flower emergence. The variation of drought periods and irrigation in all treatments were not effected on fruit weight, fruit size, and aril thickness. The total nonstructrual carbohydrate (TNC) and total nitrogen (TN) in leaves of rambutan in all treatments increased during drought period until flower intiation and decraesed after flower initiation was completed.
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Эту запись предоставил Kasetsart University