2.4 Mg grains / fed., Mg = 106 g ) and low-yielding populations (409 observations). DRIS norms were calculated for the high-yielding population because the high yield usually results from balanced nutrients in plant. DRIS norms of n/p, n/k and k/p were calculated [being Σ(N/P)/n, Σ(N/K)/n, and Σ(K/P)/n, respectively; where N, P and K are percentages of the respective nutrients in plant, and n = the number of observations].Calculated DRIS norms were 13.93, 1.40 and 10.25 for n/p, n/k and k/p, respectively and were almost comparable with those obtained by other researchers for wheat in other countries.The N, P and K nutritional balance of wheat plants grown in Kalubia “semiarid region” tested by the DRIS approach show that nitrogen was the most limiting nutrient indicating high increasing requirements for high-yielding populations followed, by phosphorus. A high demand of P by these populations was proven as it came in the first and second order of limitation. Both nitrogen and phosphorus should be adequately covered through a sound fertilization program.
Thus, establishing DRIS norms for wheat is of a vital importance towards obtaining high yields. The DRIS norms could be used to test the nutritional balance of nutrients in plant and diagnose nutrient requirements through calculating DRIS indices or direct application of a proposed standard physiological diagnosis (PD) chart to the low-yielding populations. Research should be directed towards establishment of database from which DRIS norms for each of the most important strategic crops could be developed to assess the elements of obtaining high crop yield production.The Diagnosis and Recommendation Integrated System]]>
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"HA+AA1" > HA > AA2 > AA1. Highest straw yield (5.82 Mg ha–1) was by HA+AA1+15Gy. Highest seed yield (2.99 Mg ha–1) was by HA+AA2+30Gy. Highest uptake of P (23.2 kg ha–1) and K (206 kg ha–1), respectively at straw were achieved owing to the addition of HA+AA1+15Gy gamma ray while treatment of HA+AA2 with 15Gy gamma ray gave highest N-uptake (163 kg ha–1). Highest N, P and K uptake in seeds (149, 19.1 and 49.0 kg ha–1, respectively) were by (HA+AA2+15Gy gamma ray dose). The treatment of HA+AA2 with 15Gy gamma ray was superior to the other treatments.
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