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Science, Technology and Development Vol. 37 (1), 2018
Research Article
Quantification of Impact of Sowing Dates on Productivity of Rainfed Wheat
Muhammad Aqeel Aslam, Mukhtar Ahmed, Fayyaz-ul-Hassan , Shakeel Ahmad, Rifat Hayat and Obaid Afzal
 
Abstract: Field experiments conducted under rainfed agriculture for two consecutive years (2013-2015) revealed that temperature stress at the Anthesis and during grain filling duration is the most limiting factor for the productivity of spring wheat in rainfed regions of Pakistan. Four sowing dates (SD1, 21-30 Oct, SD2, 11-20 Nov, SD3, Dec 1-10 Dec and SD4, Dec 21-30 Dec, during 2013-14 and 2014-15) were evaluated at three variable locations, Islamabad (Low temperature), URF-Koont (Medium temperature) and Talagang (High temperature) of rainfed Pothwar. Earlier sowing resulted in higher yield (3.04 t ha–1), while advancing the sowing dates than optimum resulted to lower grain (1.44 t ha–1). Similarly, higher biological yield (38%), plant height (41%), number of tillers (42%), spike length (20%), spikelet per spike (42%), grains per spike (36%), thousand grain weight (41%) was observed under early sowing dates than the later sowing dates. At Islamabad, where temperature was lower than URF-Koont and Talagang, spring wheat yield was higher (32%). Meanwhile, genotype Pak-13 produced better results than other genotypes. This study revealed that optimal timing for sowing and selection of suitable temperature resistant genotypes are good strategies to improve the productivity of rainfed crops in temperature stressed area.
 
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