PATEL, M. L.PARMAR, RAJESHBHAI RAMABHAI2018-06-052018-06-052003http://krishikosh.egranth.ac.in/handle/1/5810049168A field experiment was conducted at the College Agronomy Farm, B. A. College of Agriculture, Gujarat Agricultural University, Anand Campus, Anand to find out "Weed management under different date of sowing in dwarf wheat (Triticum aestivum 1.) Cv. GW-496" during rabi season of 2001-2002. The soil of the experimental area was loamy sand in texture having good drainage capacity with 7.8 pH. The experiment was laid out in split plot design with four replications. Eighteen treatment combinations comprising three different sowing dates (20th November normal sown, 5th December and 20th December, mid late and late sown respectively) and six weed management practices (Isoproturon pre-emergence @ 1.0 kg ha-1. Isoproturon pre-emergence @ 1.0 kg ha-1 +2,4-D Na salt @ 0.500 kg ha-1 at 35 DAS, Isoproturon pre-emergence @ 1.0 kg ha-1 + HW at 35 DAS, 2,4-D Na salt @ 0.750 kg ha-1 at 21 DAS, Hand weeding twice 20 and 40 DAS and weedy check). The results indicated that the normal date of sowing gave significantly higher grain yield than mid late and late sowing. The yield components were markedly affected due lo an anomaly of prevalent weather conditions and finally the grain yields. The normal sowing date of wheat which may attributed lo provide sufficient period for vegetative growth of crop resulting in higher yield attributes whereas late sown crop was exposed to higher temperature during its reproductive phase which may had caused adverse effect on fertile spikelets, grain development and its ripening, so normal sown wheat had gave significant higher grain yield and finally the higher net economic return. Study on weed flora revealed that total weed population and weed biomass at harvest had almost the same trend as that of grain yield. These characters showed declining trend, corresponding with the delay in sowing. Weed control methods significantly lower down the total weed population and weed biomass at harvest. The application of isoproturon pre-emergence @ 1.0 kg ha-1 + HW at 35 DAS recorded lowest number of total weed count and weed biomass at harvest while, it was highest under weedy check. The weed free treatment HW twice recorded significantly lower weed biomass and weed count. Growth and yield attributes of wheat crop were also influenced by weed management practices, isoproturon pre-emergence @ 1.0 kg ha-1 + HW at 35 DAS had recorded significantly higher plant height as compared to weedy check. Similarly, the number of effective tillers/plant, length of earhead, number of grains/earhead and grain weight/earhead and test weight. Interaction effect of date of sowing x weed control method revealed that the treatment combination isoproturon pre-emergence @ 1 .0 kg ha-1 + HW at 35 DAS under normal sown condition gave maximum grain yield and yield attributing characters, but it was almost similar to hand weeding twice under normal sown condition. The total weed population and weed biomass at harvest were lowest in late sown condition under isoproturon pre-emergence @ 1.0 kg ha-1 + HW at 35 DAS. Looking to the economics of various treatment combinations normal date of sowing with application of isoproturon pre-emergence @ 1.0 kg ha-1 + HW at 35 DAS had recorded maximum net profit (Rs. 24264/ha) followed by hand weeding twice under normal date of sowing (Rs. 23145/ha) with CBR of 1:2.79 and 1:3.06, respectively.enAGRONOMY, AGRICULTUREMANAGEMENTThesis