The Residual Effect of Rice N-Biofertilization as Potential Economic for Mineral Nitrogenous Fertilization of Wheat Crop.

Abstract

This study was conducted during winter seasons of (2009)(2010) and (2010)(2011) at Meet Louza Village, Mansoura Province, Dakahlia Governorate, Egypt on a silty clay soil to find out the residual effect rice N-biofertilization on the next wheat crop (Triticum aestivum L. c.v. sakha 93). Biofertilization 8 treatments involving inoculums of Azolla (Azl), Azospirillum (Azs), Azotobacter (Azt), and Cyanobacreria (Cyn) as well as mixtures (Azl + Azs), (Azl + Azt), (Azs + Azt) and (Cyn + Azt) which take the same location with the same layout of the experimental field for the previous crop (rice), soil N-fertilization (4 treatments of control, 12.5 %, 18.75 and 25 % of N-recommended level 75 kg N fed -1 as urea) were tasted in a split plot design with three replicates. The most important finding could be summarized as follows:  Treatment of 25 % N-level led to highest increases for plant height, grain yield, chlorophyll (a) and (b) content and the highest values were (101.27cm, 1.57 Mg fed -1 f.w) occurred with the combination of (12.5% N-level + Azs) and The superiority net return (3060 £.L. fed -1 .) of wheat crop, was given by combination of (25 % N-level + Azs).

Importance of Organic Manuring and Mineral Fertilization for Wheat Yield and Its Components in El-Dakahlia Governorate .

“…Organic manure has better effects on soil chemical , physical , biological and subsequent nutritional characterististics for grown crops. Nitrogen, Phosphorus , potassium and Zinc mineral fertilization for wheat ; in optimum recommended rates and under optimum conditions of the other variables ; may maximize fertilizer use efficiency and subsequent higher wheat yields (Genaidy et al 1987 ;Genaidy , 1994 ;Genaidy and Hegazy , 1998 ;2001, Genaidy et al , 2007Ali et al , 2011;El-Sirafy et al (2011a) ; El-Sirafy et al ( 2011b ) .…”