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Articles by F. Subhan
Total Records ( 3 ) for F. Subhan
  F. Subhan , A. Nazir , M. Anwar , Nazir H. Shah , M. Siddiq , I. Ali , J. Rahman and T. Sajjad
  An experiment was conducted at Cereal Crops Research Institute Pirsabak Nowshera during 2002-03 on six wheat cultivars/advance lines to identify the best suitable time of planting in the central agro-ecological zone of NWFP. Randomized complete block design was used with 3 replications. Six planting dates were used from October 25th to December 15th with 10 days increment. Data were recorded on Days to 50% heading, Days to maturity, Plant height and Grain yield. Maximum number of days (132) to 50% heading were recorded when planting was done on October 25th Minimum number of days (114) were reported when planting was done on December, 15th. Maximum number of days (178) to maturity were recorded when planting was done on October 25th. Number of days to maturity decreased as planting was delayed with 10 days increment. Minimum number of days (130) were recorded when planting was delayed till 15th of December. Highest plant height (98 cm) was recorded when planting was done on October 25th and November 05th. Plant Height decreased as planting was delayed. Minimum Plant height (85 cm) was recorded when planting was delayed till 15th of December. Maximum grain yield (3937 kg ha-1) was recorded when planting was done on November 05th. Grain yield decreased as planting was delayed with 10 days increment. Minimum grain yield (2274 kg ha-1) was observed when planting was done on 15th of December. A negative correlation was recorded between planting dates and days to 50% heading, days to maturity, Plant height and Grain yield. The yield losses due to late planting recorded were 8% when planting was done on November 15th, 22% loss when planting was done on 25th November, 34% losses were incurred when planting was done on December 5th and 42% losses were recorded when planting was further delayed till December 15th. Hence it is concluded that first two weeks of November is the best time for obtaining higher yields from the recommended cultivars.
  F. Subhan and L. H. Edwards
  Fifteen genotypes of group IV and group V soybeans from the Oklahoma Soybean Variety Test were grown from 1991 to 1994 at four Oklahoma (USA) locations and in 1994 four NWFP (Pakistan) locations to investigate Genotype x Environment (GE) interactions and genotypic stability. Significant Genotype x Locations and Genotype x Location x Year (GLY) interactions was observed for seed yield. The top-yielding genotypes at Bixby were Hartwig, OK 885409, HSC 591 and Hutcheson. At Haskell the top-yielding genotypes included Hutcheson, OK 885409 and Manokin. At Chickasha and Goodwell 7 and 9 genotypes were in the top yielding group; respectively. OK 885409 was in the top-yielding group in 1991, 1992 and 1994 at Bixby, in 1991, 1993 and 1994 at Chickasha, and in all four years at Haskell. A significant Genotype x Location (GL) interaction was observed for seed yield when all eight locations (in Pakistan and the USA) were studied in 1994. Only Haskell-Mansehra and Chickasha-Mansehra showed nonsignificant Genotype x Location interactions. Combined regression analysis was also used. Genotypes OK 885409, Hutcheson, HSC 401 and Bay had nonsignificant residual mean squares but only OK 885409 and Hutcheson had b value close to one and a mean yield higher than the grand mean. These genotypes are less responsive to favorable environments, but should perform in a more predictable or stable manner.
  F. Subhan , M. Anwar , N. Ahmad , A. Gulzar , A. M. Siddiq , S. Rahman , I. Ahmad and A. Rauf
  An experiment was conducted at Cereal Crops Research Institute Pirsabak Nowshera during 2000-01 to study the effect of gamma radiation at the rate of 10, 20 and 30 Krads on growth and yield of barley fertilized with 30,60 and 90 kg ha-1 of nitrogen. Nitrogen was applied in split doses at sowing and tillering stages with 100 kg ha-1 of Single Super Phosphate (SSP) as a basal dose. Nitrogen significantly increased plant height, straw yield, 1000-grain weight and grain yield. The application of 90 kg N ha-1 produced 3875 kg of grain and 13667 kg ha-1 straw yield. Irradiation had positive effects on grain yield with maximum production at the rate of 10 krads of gamma rays. An increase in straw yield was also observed with increase in radiation doses, where maximum straw yield was recorded with 30 krads of radiation. Moreover, spike length and 1000-grain weight were also significantly increased with radiation. The interaction of both variables in most cases was significant with positive relation ships with the characters studied in the experiment.
 
 
 
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