Maximizing wheat yield under N,K and B fertilization [electronic resources].

Includes references.

Two field experiments were conducted at Sakha Agricultural Research Station, North Delta, Egypt during two successive growing seasons (2010-2011 and 2011- 2012) to study the effect of nitrogen fertilization with and without K and B application on wheat yield in addition to evaluate quantitatively the response of wheat grain yield to fertilizer application using a polynomial quadratic equation. Five N levels ( 0, 30, 60, 90, and 120 kg N fed-1) were applied as a main plots, with 2 levels of K ( 0 and 50 kg K20 fed-1) as sub-plot, and B solution- at 0.1% concentration sprayed after 70 days from sowing as sub-sub plots. The cultivated wheat variety was Sakha 69. The main results could be summarized as follows: 1- Increasing N levels up to 90 kg fed-1 led to a significant increase in the grain yield. Also, the grain yield was increased with potassium application in average by 2.5 %. Foliar application of boron resulted in increasing the grain yield in average by 2.48%. 2- The estimated values of the maximum N rate (Xmax) were 2.76, 2.83, 2.78 and 2.77 units of N fed-1. (one N unit = 30 kg) for the treatments of N only (A), N with B (B), N with K(C) and N with B and K(D), respectively. The estimated values of maximum wheat grain yield (Ymax) (17.051, 17.586, 17.788 and 18.140 ardab fed-1 for the four treatments, respectively) were increased by applying K and B fertilizers. 3- The economic optimum yield (Y opt) was obtained by applying the economic optimum rates (Xopt). The values of Xopt were 2.63, 2. 70, 2.65 and 2.64 N units fed-1 for the four treatments, respectively. The values of Y opt were 17 .03, 17.57, 17.76 and 18.13 ardab fed-1 for the previous mentioned treatments, respectively. The net returns of using N fertilizer were 2612.80, 2753.82, 2766.34 and 2865.10 LE fed-1 for the four treatments, respectively. Hence, it could be concluded that the maximum and optimum wheat grain yield (Y max and Y opt) were increased by applying K and B fertilizers.

Summary in Arabic.

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