![]() ![]() Nitrogen plays a vital role in all living tissues of the plant. Its straw is used as animal feed and also for manufacturing paper. It is consumed in many forms like bread, cakes, biscuits, bakery products, and many confectionery products. Wheat is primarily used as a staple food providing more protein than any other cereal crop. It is the most important winter crop of Pakistan. Wheat ( Triticum aestivum L.) belongs to family Poaceae tribe Hordeae. ![]() The mean annual precipitation is 150~250 mm and relative humidity varies from 51% in June to 78% in October (Anonymous, 2002). It is hot and dry in summer with moderate spells of rain during monsoon season. The soils of the area are calcareous, deficient in organic matter, nitrogen, phosphorus and adequate to marginal in potassium. Besides certain local variability the area is comprised of four basic divisions viz mountains, a series of steeply sloping alluvial fans, the “Daman” imperceptibly sloping piedmonths, and the “Kacha” the flood plains of the Indus River. Dera Ismail Khan is bounded by Sulaiman Range to the West, the Indus River on the East, Marwat and Bhittani Ranges on the North and Vehowa Nala (Punjab) on the South. This zone is in the extreme south of (NWFP) Pakistan at the bank of the River Indus. However, dose of 200 kg N/ha, compared to dose of 150 Kg N/ha, significantly increased the protein content.ĭera Ismail Khan lies in Pakistan’s arid zone (71.07° longitude, 31.57° latitude and 500 m above sea level). ![]() Grain yield and biological yield were statistically similar at doses of 150 kg N/ha and 200 kg N/ha. Inqilab-91 had heavier grains and the most grain protein content, while Dera-98 had the maximum plant population and spikes/m 2. Among wheat varieties Daman-98 had maximum plant height, spike weight, grains/spike, 1000-grain weight, biological yield and grain yield. Maximum plant height, total number of plants/m 2, number of spikes/m 2, spike weight, biological yield and grain protein content were observed at 200 kg N/ha. The results showed that different nitrogen levels had significant effects on plant height, total number of plants/m 2, number of grains/spike, number of spike/m 2, spike weight, biological yield, grain yield and grain protein content. Nitrogen doses used were 0, 50, 100, 150 and 200 kg/ha. The experiment was laid out in split plot design having four replications using a net plot size of 2 m×5 m. Inqilab-91, Daman-98, Dera-98 and Punjab-96 at Gomal University, Dera Ismail Khan (NWFP), Pakistan during 2000~2001. Experiment was conducted to determine the effect of different nitrogen levels on four bread wheat varieties ( Triticum aestivum L.) viz. ![]()
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