The influence of seasonal variations on yield components of sunflower
The wider adaptability of the crop and wide range of climatic conditions of Pakistan make it possible to have two crops of sunflower in a year. Field experiments, one in spring and one in autumn were conducted at the University of Arid Agriculture, Rawalpindi, Pakistan to evaluate the influence of...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Universiti Putra Malaysia Press
2003
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3479/ http://psasir.upm.edu.my/id/eprint/3479/1/The_Influence_of_Seasonal_Variations_on_Yield_Components_of_Sunflower.pdf |
| _version_ | 1848839542273998848 |
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| author | Hassan, Fayyaz-Ul Ahmad, Rana Ashfaq Qadir, Ghulam |
| author_facet | Hassan, Fayyaz-Ul Ahmad, Rana Ashfaq Qadir, Ghulam |
| author_sort | Hassan, Fayyaz-Ul |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The wider adaptability of the crop and wide range of climatic conditions of Pakistan make it possible to have two
crops of sunflower in a year. Field experiments, one in spring and one in autumn were conducted at the University of Arid Agriculture, Rawalpindi, Pakistan to evaluate the influence of seasonal variation on yield and yield components of sunflower. Four sunflower hybrids were planted in randomized complete block design with
three replications. Two central rows were harvested for the measurement of yield and yield components. It was
observed that head size of spring crop was larger than autumn crop which was considered to be the result of overall
better plant structure, length of crop life cycle, slow and gradual rise in cumulative degree days. Contrary to head
size, thousand seed weight of autumn crop was found to be more than that of spring crop. Lesser seed weight
of spring crop may be the result of competition for assimilates which left many seeds malnourished as larger head might have encouraged the initial setting of seeds. However, final yield of spring crop was greater than that of
autumn crop. It led to the conclusion that having spring crop is the best option, however, autumn crop could
be supplementary one to increase the production of oil seeds. |
| first_indexed | 2025-11-15T07:13:06Z |
| format | Article |
| id | upm-3479 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T07:13:06Z |
| publishDate | 2003 |
| publisher | Universiti Putra Malaysia Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-34792015-09-11T00:53:50Z http://psasir.upm.edu.my/id/eprint/3479/ The influence of seasonal variations on yield components of sunflower Hassan, Fayyaz-Ul Ahmad, Rana Ashfaq Qadir, Ghulam The wider adaptability of the crop and wide range of climatic conditions of Pakistan make it possible to have two crops of sunflower in a year. Field experiments, one in spring and one in autumn were conducted at the University of Arid Agriculture, Rawalpindi, Pakistan to evaluate the influence of seasonal variation on yield and yield components of sunflower. Four sunflower hybrids were planted in randomized complete block design with three replications. Two central rows were harvested for the measurement of yield and yield components. It was observed that head size of spring crop was larger than autumn crop which was considered to be the result of overall better plant structure, length of crop life cycle, slow and gradual rise in cumulative degree days. Contrary to head size, thousand seed weight of autumn crop was found to be more than that of spring crop. Lesser seed weight of spring crop may be the result of competition for assimilates which left many seeds malnourished as larger head might have encouraged the initial setting of seeds. However, final yield of spring crop was greater than that of autumn crop. It led to the conclusion that having spring crop is the best option, however, autumn crop could be supplementary one to increase the production of oil seeds. Universiti Putra Malaysia Press 2003 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/3479/1/The_Influence_of_Seasonal_Variations_on_Yield_Components_of_Sunflower.pdf Hassan, Fayyaz-Ul and Ahmad, Rana Ashfaq and Qadir, Ghulam (2003) The influence of seasonal variations on yield components of sunflower. Pertanika Journal of Tropical Agricultural Science, 26 (2). pp. 109-113. ISSN 1511-3701 http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JTAS%20Vol.%2026%20(2)%20Sep.%202003/06%20JTAS%20Vol.26%20(2)%202003%20(Pg%20109-113).pdf |
| spellingShingle | Hassan, Fayyaz-Ul Ahmad, Rana Ashfaq Qadir, Ghulam The influence of seasonal variations on yield components of sunflower |
| title | The influence of seasonal variations on yield components of sunflower |
| title_full | The influence of seasonal variations on yield components of sunflower |
| title_fullStr | The influence of seasonal variations on yield components of sunflower |
| title_full_unstemmed | The influence of seasonal variations on yield components of sunflower |
| title_short | The influence of seasonal variations on yield components of sunflower |
| title_sort | influence of seasonal variations on yield components of sunflower |
| url | http://psasir.upm.edu.my/id/eprint/3479/ http://psasir.upm.edu.my/id/eprint/3479/ http://psasir.upm.edu.my/id/eprint/3479/1/The_Influence_of_Seasonal_Variations_on_Yield_Components_of_Sunflower.pdf |