Growing degree days and yield relationship in sunflower (Helianthus annuus L.)

Qadir, G.; Fayyaz-ul-Hassan; Malik, M.A.

Growing degree days and yield relationship in sunflower (Helianthus annuus L.)

2007

Qadir, G. (University of Arid Agriculture, Rawalpindi (Pakistan)) | Fayyaz-ul-Hassan (University of Arid Agriculture, Rawalpindi (Pakistan)) | Malik, M.A.

A field study was conducted to document the relationship between growing degree days, yield and yield components of sunflower hybrids. Five sunflower hybrids (Super-25, Parsun-1, SMH-9706, Award and Hysun-33) were sown on ten planting dates both during autumn and spring in a randomized complete block design with split plot arrangements replicated four times. Sunflower hybrids exhibited significant differences for yield, yield components and growing degree-days. During autumn, amongst hybrids Hysun-33 accumulated the maximum growing degree-days and remained at the top for achene yield and all yield components. During autumn, the crop planted on 11th July accumulated maximum growing degree-days and produced the higher achene yield, larger head diameter, more number of achene per head. During spring, Hysun-33 again remained at the top for yield and yield components except that of head diameter for which hybrid Award over ruled rest of the hybrids . During spring season the crop planted on 16th of February accumulated the maximum growing degree-days and produced the highest yield and yield related components. Overall, spring plantation accumulated more growing degree-days in comparison with autumn planting, due to which the spring plantation exhibited higher achene yield and all the yield components.

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