The influence of seasonal variations on yield components of sunflower
2003
Fayyaz-ul-Hassan | Rana Ashfaq Ahmad | Ghulam Qadir
The wider adaptability of the crop and wide range of climatic conditions of Pakistan make it possibk to have twocrops of sunflower in a year. Field experiments, one in spring and one in autumn were conducted at theUniversity of Arid Agriculture, Rawalpindi, Pakistan to evaluate the influence of seasonal variation on yield andyield components of sunflower. Four sunflower hybrids were planted in randomized compkte block design withthree replications. Two central rows were harvested for the measurement of yield and yield components. It wasobserved that head size of spring crop was larger than autumn crop which was considered to be the result of overallbetter plant structure, kngth of crop life cycle, slow and gradual rise in cumulative degree days. Contrary to headsize, thousand seed weight of autumn crop was found to be more than that of spring crop. Lesser seed weightof spring crop may be the result of competition for assimilates which kft many seeds malnourished as larger headmight have encouraged the initial setting of seeds. However, final yield of spring crop was greater than that ofautumn crop. It kd to the conclusion that having spring crop is the best option, however, autumn crop couldbe supplementary one to increase the production of oilseeds.
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