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CAUSES OF YIELD REDUCTION BY DELAYED PLANTING OF HEXAPLOID
WHEAT IN PAKISTAN
MOHAMMAD AKMAL1, S.M. SHAH1, MUHAMMAD ASIM2
AND M. ARIF1
Abstract:
Soil moisture availability at planting time of wheat (Triticum
aestivum L.) is critical and can delay sowing if moisture is
insufficient in a typical rainfed area. Shortening of vegetative
growth (post emergence to pre flowering) by delay sowing can cause
yield losses. We compared growth and yield of four wheat varieties
viz., Inqilab 91, Bakhtawar 92, Nowshera 96 and Fakhre Sarhad planted
at different dates; starting from Oct. 24 to Dec.11 with 15 days
interval at the Research Farm, KP Agricultutal University Peshawar,
Pakistan. Uniform cultural practices were applied during the crop
growth. Fakhre Sarhad ranked the best (p<0.05) variety, followed by
Nowshera 96, Bakhtawar 92 and Inqilab 91 for seed yield. However, each
delay in sowing from Oct. 24 onwards decreased (p<0.05) seed yield.
Emergence and tiller number by late sowing decreased. Rate and
duration of linear growth stage (LGS) along with time of peak periods
also differed for the varieties and sowing dates. The LGS duration
among varieties differed from 28 to 54 for Inqilab 91, 30 to 60 for
Bakhtawar 92, 48 to 75 for Nowshera 96 and 45 to 65 for Fakhre Sarhad
by delaying sowing time which created significant differences in seed
and biomass production. It was observed that crop growth rate and its
duration in the LGS are in close association with dry matter and seed
losses. Breeding efforts need to improve LGS of wheat variety to be
recommended as rainfed variety for the area.
1Agricultural University, Peshawar, Pakistan
2CCRI Pirsabak Nowshera, Pakistan
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