PJB-2005-102
GROWTH AND DEVELOPMENT OF SUNFLOWER IN RESPONSE TO SEASONAL VARIATIONS
FAYYAZ-UL-HASSAN, GHULAM QADIR *MUMTAZ AKHTAR CHEEMA
Abstract
Field experiments were conducted to quantify the growth and development of sunflower in response to seasonal variation over two seasons i.e. spring and autumn. Sunflower hybrids were sown in a randomized complete block design. Growth and development parameters i.e. stem girth, plant height and dry matter accumulation m-2 were recorded at the time of maturity. Stem girth of spring crop was observed to be larger than that of autumn crop. The hybrid Suncorss-42 showed the maximum stem girth in spring which was significantly different from that of XF-263 showing the lowest stem girth in both the seasons. Plant height also followed the similar pattern like stem girth. The hybrid Suncross-42 produced the tallest plants with maximum dry matter and achene yield in both the seasons. Overall superiority of spring crop in terms of stem girth, plant height, dry matter accumulation and achene production over autumn crop may be attributed to the environmental factors prevailing during the crop life cycle and duration of crop in the field.
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