Flower initiation, fruit set and yield of rambutan (Nepthelium lappaceum L.) var. 'Roengrean' sprayed with SADH, paclobutrazol and ethephon / by Surachai Muchjajib
Material type:
TextLanguage: English Publication details: Los Baños, Laguna : 1988. Cavite State University- Main Campus,Description: 143 pages : illustrations ; 28 cmContent type: - text
- unmediated
- volume
- 634 M88 1988
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Ladislao N. Diwa Memorial Library Theses Section | Non-fiction | 634 M88 1988 (Browse shelf(Opens below)) | Link to resource | Room use only | T-1521 | 00002364 |
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Thesis (Ph.D. - - Horticulture) University of the Philippines, College, Laguna.
Includes bibliographical references.
SURACHAI MUCHJAJIB, University of the Philippines at Los Banos, September, 1988. Flower Initiation, Fruit Set and Yield of Rambutan (Nephelium lappaceum L.) var. "Roengrean' Sprayed with SADH, Paclobutrazol and Ethephon. Major Professor: Dr. Rene Rafael C. Espino
Four year old rambutan trees cv. "Roengrean" were sprayed twice during their vegetative stage with commercial grade of ethephon at 1.0, 1.5 and 2.0 mM, paclobutrazol at 1.5, 3.0 and 4.5 mM and SADH at 15.0, 30.0 and 45.0 mM on September 5 and 19, 1987, to induce early flowering.
Paclobutrazol sprayed at 1.5 or 3.0 mM appears to be optimal for inducing earlier flower bud initiation. Flower buds were initiated 12 days earlier than control. A higher dosage (4.5 mM) of paclobutrazol retards growth extensively and results in a compact panicle.
However, there were no adverse effect on flowering, fruit setting and subsequent fruit development. SADH sprayed at all those concentrations and ethephon at 1.0 and 1.5 mM induce significantly earlier flower bud initiation by about 5 days.
Foliar application of ethephon at 1.0 mM paclobutrazol at 1.5 mM foliar significantly increased the percentage of flowering by 88.7 and 88.2 percent, respectively. The control trees had 75.0 percent Flowering.
Paclobutrazol sprayed at 1.5 mM is the optimum concentration to produce the highest yield (9.7 ton/ha) followed by SADH sprayed at 45.0, 15.0 mM and paclobutrazol at 4.5 mM, respectively. The control had 6.9 ton/ha and ethephon at 2.0 mM had the least (5.6 ton/ha). Yield increases by paclobutrazol and SADH were due mainly to increase in the number of flowers/panicle, number of fruits/panicle and enhanced percent flowering. The chemicals sprayed did not affect the fruit weight, size, aril thickness and quality parameters of fruit at harvest.
The greatest economic benefit derived from the various treatments, was the accelerated fruit maturation specially those obtained by paclobutrazol sprayed at 3.0 and 1.5 mM. These concentrations may be used commercially to advance flowering of rambutan trees.
"Roengrean" rambutan trees were sampled for anatomical study at two week interval. Flower bud ontogeny was similar in plants of rambutan grown under normal conditions and under treatment with all experiment concentrations of ethephon, paclobutrazol and SADH sprays. However, foliar sprays induced earlier formation and subsequent development.
Spraying trees with these chemicals induced earlier and intensive flowering (except ethephon at 2.0 mM) probably due to an alteration of the C/N ratio of the trees. The increased C/N ratio associated with flower bud formation indicated a positive correlation between C/N ratio and flower initiation.
Submitted to the University Library 01/07/1994 T-1521