Response of Different Phosphorus Levels on Growth and Productivity of Wheat (Triticum aestivum L.), Under Agro- Climatic Conditions in Kabul

Agriculture is a major contributor to the national economy and food security of developing countries especially in Afghanistan. Wheat is a crucial crop for ensuring food security. It is among the most significant crops grown in Afghanistan. It is the leading source of carbohydrates for humans. To fine the effect of fertilizer especially (P) on enhancing this crop productivity, the study was conducted at the agricultural research farm of agriculture faculty of Kabul University over two years (March 17, 2020, and March 4, 2021). The experimental design was a simple randomized complete block (RCB) design with three replications and five phosphorus levels (0, 30, 60, 90, and 120 kg P ha-1) and a constant dose of 120 kg N ha-1. Each sub-plot measured 3m x 2m. The row spacing was maintained at 30 cm, and the Maqawim-09 wheat variety was sown at a seed rate of 140 kg ha-1. Di-ammonium phosphate (DAP) was used as the phosphorus source and urea for nitrogen. Agronomical practices were uniform across all plots. Data were collected on various parameters during the study, including plant height (cm), stem number per m2, leaf number per plant, spike number per m2, spike length (cm), grain number per spike, spikelet number per spike, grain number per spikelet, grain yield (ton/ha), thousand grain weight, and dry matter (ton/ha). The results indicated that applying phosphorus in the form of DAP at a rate of 90 kg ha-1, along with 120 kg ha-1 of nitrogen, significantly improved the growth and productivity of the Maqawim-09 wheat variety. All parameters were significantly affected by the phosphorus rates. Thus, it is recommended that phosphorus in the form of DAP at a rate of 90 kg ha-1 and nitrogen in the form of urea at a rate of 120 kg ha-1 should be applied to maximize wheat crop yield.