ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Control of the size of litchi trees by pruning and chemical growth regulators.

Oosthuizen, J. H.;

Yearbook - South African Litchi Growers' Association Year: 1994 Vol: 6 Pages: 21-23 Ref: 7 ref.

1994

บทคัดย่อ

ABSTRACT :

The results for the first 5 years of a long-term project are discussed, with data on tree size and yields for the cultivar HLH Mauritius which has a tendency towards vigorous vegetative growth. Paclobutrazol (as PP 333) sprays were applied (1) to the young panicles of flower buds at 234.38 or 46876 mg/litre, (2) to the postharvest growth when relatively hard at 234.38 or 468.76 mg/litre, (3) to the soil around the tree trunk at 0.25 kg litre-1 m-2, or (4) to the soil as in (3) but at 0.5 g litre-1 m-2 with a second application at half the rate in the following season. Bearing shoots were selectively pruned during fruit harvesting either alone (5) or in combination (6) with a soil application of paclobutrazol as in (3). Chlormequat (as CCC) was applied to the postharvest growth and to the young panicles of flower buds at (7) 234.38 mg/litre or (8) 468.76 mg/litre. Controls received no pruning or spraying. Both tree volume and growth could be controlled successfully by pruning and/or paclobutrazol

 soil application. These treatments, however, produced wider variations in yield/tree than the control; they were more labour-intensive and the input costs were higher. No treatments appeared to have adverse effects on fruit quality.