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Two field experiments were carried out at Demo-El-Faiyoum ,Governorate in 2002 and 2003 seasons to study the effect of two nitrogen sources (Ammonia gas and Urea), three nitrogen rates (100,120 and 140 kg N/fad) and six micro element treatments (Zn, Fe and Zn+Fe as a soil and foliar application methods) on yield and yield components of maize. The experiment was laid out in split-split plot design. The obtained results showed clearly that plants received nitrogen fertilizer in the form of ammonia gas gave the highest values of ear length ,100 grain weight , grain yield per fad and protein percentage in grain as compared with those received nitrogen source of urea. Increasing nitrogen fertilizer rate from 100 to 140 kg N/fad significantly increased ear length , 100 grain weight , stover and grain yield per fad and protein percentage in grain. Sprayed maize plants with mixed from micro elements Zn+Fe as a foliar application surpassed all other treatments in all previously mentioned characters. Applied ammonia gas as a source of nitrogen at the rate of 140 kg N/fad gave the highest ear length, grain yield per fad and grains protein percentage . Plants grown on soil injected by ammonia gas and sprayed with mixed from micro elements Zn+Fe gave higher grain yield per fad and protein percentage than other treatments. Plants fertilized with 140 kg N/fad and sprayed with micro element mixed Zn+Fe gave the highest ear length , grain yield / fad and protein % . Plants treated with ammonia gas at 140 kg N fad and sprayed with mixed from micro elements gave the highest ear length , grain yield per fad. Generally, it could be recommended that applying nitrogen in the form of ammonia gas at the rate of 140 kg N /fad and sprayed with mixed from Fe+Zn micro elements gave greatest grain yield of maize grown under salt affected soils at ElFaiyoum Governorate conditions.

journal of plant production

EFFECT OF NITROGEN SOURCE AND RATE AS WELL AS SOME MICRO ELEMENTS TREATMENTS ON YIELD AND YIELD COMPENENTS OF MAIZE UNDER SALT AFFECTED SOILS CONDITIONS