|Pak. J. Bot., 37(4): 859-864, 2005.||Back to Contents|
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.
Department of Agronomy, University of Arid Agric. Rawalpindi.
Corresponding Author: firstname.lastname@example.org
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