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Ali L.,Adaptive Research Farm | Ali M.A.,Agriculture Ext. and AR | Ali M.,Adaptive Research Farm | Waqar M.Q.,Agriculture Adaptive Research
International Journal of Agriculture and Biology | Year: 2013

A field study was carried out to evaluate the impact of inorganic fertilization to wheat variety Sehar-2006 on aphid infestation, natural enemies' population, growth and grain yield according to randomized complete block design with three replications at Adaptive Research Farm, Vehari during 2009-2010 and 2010-2011. Five NPK doses of 170-0-0 (T1), 170-114-0 (T2), 170-0-62 (T3), 170-114-62 (T4) and 0-0-0 (T5) (Control) kg ha-1 were tested in the experiment. Average results of the both years showed that NPK doses affected all the growth and yield parameters significantly. Application of 170-114-62 NPK kg ha-1 gave maximum plant height (110.1 cm), highest germination counts (240.2), increased No. of productive tillers (376.3), highest No. of grains spike-1(42.33), heavier grain weight (41.57 g) and maximum grain yield (3732 kg ha-1) as compared to data recorded with 170-0-62, 170-114-0, 170-0-0 and 0-0-0 (control) NPK kg ha-1. Results also indicated that main effects of time of sampling, NPK doses, and their interaction significantly affected aphid and predator population. On 15.03.2010, maximum aphid population per tiller (12) was observed, where 170-0-0 NPK kg ha-1 was applied followed by (11.78) at 0-0-0 NPK kg ha-1 as against the minimum (6) with 170-114-62 NPK kg ha-1. Maximum aphid population per tiller (7.445) was observed, where 170-0-0 NPK kg ha-1 was applied followed by (5.963) at 170-0-62 NPK kg ha-1as against the minimum (2.852) with 170-114-62 NPK kg ha-1recorded on 15.03.11. A highest population of predators per plant (1.259 and 1.562) was observed during 31.03.2010 and 31.03.2011, respectively followed by (1.018) on 22.03.10 and (0.424) on 22.03.2011. Significant negative relationships (R2=-0.86 and-0.75) was depicted between NPK doses and No. of aphids during 2009-2010 and 2010-2011, respectively. Gradual decrease in aphid population was noted when balanced NPK was applied. Significant relationship (R2=0.71 and 0.87) was found between maximum temperature and predators per plant during 2009-2010 and 2010-2011, respectively. Negative correlation (r=-0.82 and-0.57) was observed between aphid population and grain yield during 2009-2010 and 2010-2011, respectively with respect to inorganic fertilization on wheat crop. © 2013 Friends Science Publishers. Source


Malik A.U.,Agriculture Adaptive Research | Hussain I.,Agriculture Adaptive Research | Bukhsh M.A.A.H.A.,Agriculture Adaptive Research
Soil and Environment | Year: 2010

Field trials were conducted to estimate the effect of number of irrigations on yield of wheat crop in the semi arid area of Pakistan at Adaptive Research Farm, Mouza Rakh Chabbri Zareen, D. G. Khan for three consecutive years from 2005-06 to 2007-08. The study comprised of three treatments including four irrigations (T1) at crown root development, booting, milking and grain development; five irrigations (T2) at crown root development, tillering, milking, grain development and dough stage and six irrigations (T3) at crown root development, tillering, milking, grain development, dough stage and at maturity. The results revealed that during the year 2005-06 and 2006-07 the grain yield and yield contributing parameters were significantly higher when crop was irrigated with five irrigations (T2), while 1000-grains weight, germination count m-2 and number of tillers m-2 were not affected significantly during the year 2005-06 and 2007-08. The highest grain yield was recorded with five irrigations at different critical growth stages of wheat crop. The possible reason might be availability of more moisture. The results revealed that the application of irrigation at tillering stage played a vital role to increase wheat yield and contrarily the application of irrigation at maturity caused decrease in wheat yield. © 2010, Soil Science Society of Pakistan. Source

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