Potential of Sunflower Varieties Grown under Different Input Levels

抄録

This experiment was aimed to investigate the potential of sunflower varieties (Helianthus annuus L.) grown under different levels of inputs. Sunflower varieties consisted of two hybrids (Pacific 77 and Olison 3) and two synthetic varieties (Suranaree (S) 471 and Suranaree (S) 473). Input levels were low, medium and high packages which were obtained from the combination of levels of weed control and fertilizer applications. The study was conducted in a strip-plot design in the dry season of 2010 and 2011 at Chaipattana-Mae Fah Luang Reforestation Project, Prachuap Khiri Khan, Thailand. The results showed that both synthetic varieties outyielded the two hybrids. S471 produced the highest yield of 2,269 kg ha^-1. However, the oil content of Pacific 77 was the highest, with 42 percent. The responses of sunflower varieties to levels of input were not significant almost for all characters except for oil content. Seed yields were 1,931, 2,025 and 2,375 kg ha^-1 for low, medium and high input packages, respectively. Seed size showed positive association with the levels of input. However, the oil content did not increase with the increase of input levels. The net income of all varieties grown under different levels of input were estimated by using the farm gate price. The highest net income of 21,500 baht ha^-1 was obtained from S471 grown under the lowest input level. For this study where the soil is quite fertile, the lowest input levels should be used for all varieties of sunflower.