Responses to water stress of sunflower (Helianthus annuus L.)
1994
Chalermpone Sampet (Chiang Mai Univ., Chiang Mai (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Growth and yield of Helianthus annuus cv. Hysun 33 was studied under withholding of water at various stages of plant development and irrigation frequencies (every 1, 2, 3 and 4 weeks) at the Faculty of Agriculture, Chiang Mai University during January-April 1987 on paddy soil (clay loam - sandy clay loam). Total dry matter LAI and seed yields were not affected by withholding water treatments when compared with weekly irrigation, but affected by irrigation frequencies. The mean value of seed yield from over all withholding water treatments was 3.37 t/ha. Seed yields and also total dry matter and LAI significantly decreased when irrigation interval increased. The most infrequent irrigation treatment reduced yield by 52 percent. The reduction in seed yield was due to decreasing in number of seed per capitulum and seed size. Seed oil content was significantly decreased when irrigation interval increased. The oil content of 42.1 percent was observed from the every 4 weeks irrigation treatment compared with 51.4 percent observed from the weekly irrigation one. Leaf water potential at predawn, late morning and midday throughout crop cycle are described.
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