Response of maize to integrated fertilizers / Sara Sayed Ali Elsawy ; Supervised Elmetwally Abdalla Elmetwally , Sayed Ahmed Safina Eissa , Fouad Elsayed Abdalla

Thesis (Ph.D.) - Cairo University - Faculty of Agriculture - Department of Agronomy

Two field experiments were carried out at the Agric. Exp. Res. Sta., Fac. Agric., Cairo Univ., Egypt during 2015 and 2017 seasons to study the effect of two previous winter crops (Wheat or Egyptian clover), three nitrogen levels (90, 120 or 150 kg N/fed.) and four foliar nutrients (Control, micronutrient compound(Fe 1.5%, Mn 3% and Zn 4.5% at rate of 1g/liter), potassium sulphate 1% K₂O or mixture of both) on growth, yields and quality of Zea mays L. cv. single cross 131. Also macro and micro nutrients concentrations of grains and stover of maize were measured. The obtained results are: Sowing maize after Egyptian clover gave the highest of leaf area index and dry weight/plant at milk ripe stage, biological yield/plant, seed index, grain weight/ear, grain yield/plant and fed., harvest index and concentrations of macro and micro nutrients in maize grain and stover, as well as, carbohydrate, protein and oil grain yield per unite area. Results clearly showed that Planted maize sowed after Egyptian clover gave the highest grain yield/fed. compared with that after wheat in both seasons. These increases correspond to (14.4 and 13.3 %) in the first and second seasons, respectively. Most of maize traits from growth, yield of maize and yield components and quality significantly increased with increasing the rate of N fertilizer from 90 to 150 kg N/fed. in both seasons. Increasing N rates from 90 to 120 kg/fed. and from 120 to 150kg/fed. increased grain yield/plant and its attributes in both seasons. Grain, stover yields of maize and its attributes were significantly higher with foliar application by mixture (Fe 1.5%, Mn 3% and Zn 4.5% at rate of 1g/liter), potassium sulphate 1% K₂O in both seasons

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