Yield Improvement of Jasmine (<I>Jasminum sambac</I> Aiton) in Cool Season by Chemicals Spraying

Abstract

The effect of chemical applications on the yield and floral size of jasmine were exarnine during the period of August 2003 to March 2004 using a Randomized Complete Block Design with 4 replications of 5 treatments. The treatments were as follow: The first treatment was spraying 25,000 mg/l potassium nitrate (KNO₃) immediately after the second pruning and followed by spraying 500 m/l chlormequat chloride (CCC) at day 10 after pruning. Fertilizer 15-30-15 (N-P-K) 2,000 mg/l was sprayed every 15 days. The second treatment, as per the first treatment, but the jasmine was sprayed with 100 mg/l of paclobutrazole instead of CCC. The third treatment, as per the first treatment, but the jasmine was sprayed with 0.00875 ml/l of mepiquat chloride instead of CCC. The fourth treatment, as per the first treatment, but no KNO₃ was sprayed. The fifth treatment (control), there was no chemical application. Results showed that the average flower weight/plant of 30.6, 31.2 g/plant were significantly increased in the 1^st and 3^rd treatments respectively. These were higher than the respective values in the 2^nd, 4^th and 5^th treatments of 16.1, 14.9 and 12:2 g/plant. All treatments had no effect on the jasmine flower size.