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The balanced fertilization become necessary for sustainable agriculture under conditions of old and newly soils. Moreover the balanced fertilization under stress conditions especially salinity stress becomes more important. Micronutrients are part of many crucial physiological plant processes which plants suffered from their uptake in salted affected soils, and combined application of N and micronutrients helps in improving plant growth, yield and its quality. So, two field experiments were conducted at salt affected soils at Tag Al-Ezz Research station (Latitude 30.9° 68.6' N, Longitude 31.6° 96.5" E), Dakahlia Governorate, Egypt, during growing winter seasons of 2014/2015 and 2015/2016, to evaluate the effect of applying rates of N fertilizer (50, 75 and 100 % of recommended N "i.e. 75 kg N fed-1") along with foliar application of micronutrients in chelated form; Fe- EDTA, Zn- EDTA and Mn-EDTA (F0: control, F1: two sprays at tillering and elongation stages and F2: three sprays at tillering, elongation and heading stages) on wheat yield and its components, grain quality, NPK and micronutrients contents as well as K/Na ratio in straw and grain. Results showed that all parameters of wheat yield were significantly increased with foliar application of micronutrients at the three stages (tillering, elongation and heading stages), under nitrogen fertilization rate 100 % of recommended N (75 kg N fed-1). Also, the results reveal that grain quality, i.e. 1000-grain weight, protein %, P, Fe and Zn concentrations significantly increased with nitrogen rates and foliar micronutrients applications. The uptake of macro and micro nutrients increased with increasing N rate and number of sprays micronutrients. Plant growth improved under the condition of salt affected soil with foliar spraying micronutrients and the highest N rate (75 kg N fed-1), and this was clear from plant height, straw and grain yields and concentrations of K and Na and K/Na ratio. Interaction between the highest N rate and foliar spray of micronutrients at three growth stages recorded the highest mean of grain yield (19.24 ardab fed-1) and straw yields (5368 kg fed-1). |
