الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Maize (Zea mays L.) is one of the most sensitive crops to stresses in new reclaimed soils as lacke of nutrients, salinity, drought, etc..., with an eventual result a severe depression in growth and yield. Attentions are directed recently to alleviate the deleterious impact of stresses in new reclaimed soils using different materials, which reflect inadequate influence on human health and terrestrial ecosystem. The scope of the current study was to assess the main and interaction effects of two natural and safety materials; phosphorus fertilization and humic acid (potassium humate) as soil application on growth and productivity of maize plants under newly reclaimed soil conditions. Two field experiments were carried out consecutively at the Experimental farm, Faculty of Agriculture, Fayoum University at ”Demo”, Fayoum Governorate, Egypt during the summer growing seasons 2015 and 2016. The experimental layout was a split plot design in a (Randomized Complete Blocks Design) with four replications. Phosphorus fertilizers with three levels (15, 30 and 45 kg P fed-1) were randomly distributed in the main plots, while humic acid (Potassium humate) were applied in five levels (0, 6, 12, 18 and 24 kg fed-1) were allocated in the sub-plots.
Gained results displayed that application of phosphorus at rate of 45 kg fed-1 was pioneer and significantly resulted in the tallest plant, maximum number of leaves plant-1, largest leaf area index, heaviest leaves and stem dry weight plant-1 in both seasons at 45 and 65 days after sowing. In this respect, at harvest the tallest mean values of plant, maximum ears number plant-1, maximum number of rows ear-1, heaviest ear weight plant-1, thickest ear diameter, heaviest grain weight, heaviest100-grain , maximum biological yield fed-1, straw yield fed-1, ears yield fed-1, grain yield fed-1 ,shelling percentage and harvest index were recorded with 30 and 45 kg fed-1 in both seasons.
Plant height, number of leaves plant-1, leaf area index, leaves and stem dry weight plant-1 at 45 and 65 days after sowing and ears number plant-1, number of rows ear-1, ear weight plant-1, ear diameter, ear grain weight plant-1, seed index , biological yield fed-1, straw yield fed-1, ears yield fed-1, grain yield fed-1, shelling percentage and harvest index were positively responded to soil application of humic acid at 18 and/or 24 kg fed-1 in both seasons. Results of the current study indicated that, vegetative growth and productivity of maize crop have been enhanced under newly reclaimed soil conditions by phosphorus fertilizers i.e., 45 kg fed-1 accompanied with 18 kg fed-1 of humic acid (potassium humate) soil application.