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ISHS Acta Horticulturae 555: II International Symposium on Edible Alliaceae

ENVIRONMENTAL MANIPULATION FOR CONTROLING BULBING IN GARLIC

Authors:   M.A. Rahim, R. Fordham
Keywords:   Allium sativum L., garlic, bulbing, temperature, daylength, shade
DOI:   10.17660/ActaHortic.2001.555.27
Abstract:
The paper deals with the serious problems of garlic production in Bangladesh especially the poor yield per unit area due to late planting. Some experiments were carried out at Wye College from 1985-88 to quantify the factors responsible for failure of bulbing in late planted crops and were followed by experiments conducted to investigate ways of overcoming the problem. Results indicated that the cause of poor bulbing in late planted crops in Bangladesh was probably due to increasing air and soil temperatures at the end of the season. Both air and soil temperatures above 20°C had adverse effects on growth and development. Results also demonstrated the possibility of accelerating crop development by either pre-cooling or with the use of growth regulators. Seed cloves treated either at 5 or 10°C for 15 to 30 days before planting, accelerated initiation, development and maturity of bulbs relative to those of cloves stored at 15 and 20°C. Finally, applications of these findings under Bangladesh conditions were tested and found positive results from pre- cooling treatments and growth regulators. Even agronomic practices such as irrigation and plant density which reduce soil temperature had some accelerating effects on late planted crops under Bangladesh conditions.

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