Effects of Thiourea and KNO3 on flower bud burst in durian, Durio zibethenus Murr. after paclobutrazol use
1994
Hiran Hiranpradit | Sookwat Chandraparnik | Chawaeng Kaewrak | Surmsuk Salakpetch | Umpika Punnachit (Departmemt of Agriculture, Bangkok (Thailand). Chanthaburi Horticultural Research Center)
In 1988/1989, thiourea at the rates of 500 1,000 and 1,500 ppm were sprayed on branches of durian trees pretreated by 1,000 ppm paclobutrazol at the first stage of flower bud development. Thiourea can intensify the number of inflorescences per unit length of branch, resulting in higher number of flowers per tree. A positive correlation (r=0.661) between thiourea rates and flower density was noticed. An increase of 75 percent in the number of flowers per tree was observed in trees treated with 1,500 ppm thiourea when compared with the trees pretreated with paclobutrazol. In the year 1989/90, thiourea rates of 1,000 1,500 2,000 3,000 ppm and the mixture of 1,500 ppm KNO3 were sprayed on branches of durian trees pretreated with paclobutrazol. All treatments can intensify the number of inflorescences as compared with untreated trees. However, thiourea and KNO3 failed to increase the efficiency of paclobutrazol when there was continuous rainfall exceeded 35 mm per day. To improve the efficiency of paclobutrazol during high rain, thiourea at 1,500 and 3,000 ppm and the mixture of thiourea with dextrose, humic acid and a 15-30-15 foliar fertilizer or thiourea at 1,500 ppm with NAA 11.25 ppm or 22.50 ppm and a 15-30-15 foliar fertilizer or thiourea at 1,500 ppm with Florigen were sprayed to paclobutrazol treated durian trees at dot stage with continuous rainfall exceeded 10 mm per day in the year 1990/1991. Thiourea alone at 3,000 ppm and thiourea mixed with other chemicals can increase the number of inflorescences compared with paclobutrazol alone. The treatments used in 1990/91 were applied to durian trees in 1991/92. Opposite results were detected because the amount of rainfall during dot stage was less than 10 mm per day. Thiourea alone or mixed with other chemicals could not intensify the number of inflorescences compared with paclobutrazol alone.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Kasetsart University