Effect of Phosphorus Regimes on Yield and Weed Infestation of Flax (Linumusitatissimum L.) Under Climatic Conditions of Peshawar

To study the response of Flax (Linumusitatissimum L.) to phosphorus levels (0, 30, 60, 90 kg ha-1), an experiment was conducted at the Agronomy Research farm, The University of Agriculture, Peshawar during Rabi season 2015-16. Flax cultivar LS 49 was sown in a randomized complete block design (RCBD) having three replications. Phosphorus was applied as soil. DAP was used as a source of phosphorus. Phosphorus has a substantial effect on all yield of flax. Phosphorus application has significantly increased weed fresh biomass (g m-2), weed dry biomass (g m-2) and grain yield of flax. Maximum weed fresh biomass (436.8 g m-2), weed dry biomass (39.8 g m-2) and grain yield (602 kg ha-1) of flax was recorded with P application of 90 kg ha-1, while weed density were not significantly affected by P application rates. The grain yield produce with 60 kg P ha-1 were statistically similar with the yield produce with 90 kg ha-1of P application. So it is suggested that flax should be cultivated under the application of phosphorus at the rate of 60 kg ha-1