THE COMBINED EFFECT OF CYANOBACTERIA EXTRACT AND MICRONUTRIENTS SPRAYING ON WHEAT PRODUCTIVITY, NUTRIENTS CONTENT AND NITROGEN FERTILIZER OPTIMIZATION

Two successive winter seasons of 2008/2009 and 2009/2010 wheat field experiments were carried out at Sakha Agricultural Research Station Farm, Kafr El-Sheikh Governorate, Egypt to study the effect of some micronutrients and cyanobactria spraying on wheat productivity and nitrogen fertilizer optimization. Split split plot design was used with four replicates. the main plots were assigned by two cynobacteria treatments, with and without cyanobacteria extract spraying. Nitrogen was added in the sub plots under two levels, (144 and 168 kg N ha^-1). The sub sub plots were assigned by four treatments of micronutrients spraying as follows ;-1- without micronutrients spraying (M₀) 2- micronutrients spraying as sulphate form of the used elements (M₁) 3- micronutrients chelaeted as EDTA (M₂), and 4- micronutrients cheleated as amino acids (M₃) . (The same concentration was used with the all).
         Results revealed that, the treatment of 168 kg N ha^-1, cyanobacteria and micronutrients spraying increased the grain yield compared with the other treatments. The highest grain yields (5.8 and 5.98 ton ha^-1) were obtained with the interaction between168 kg N ha^-1, cyanobacteria extract spraying and micronutrients chelated on amino acid treatment. The biological yield (14.94 and 14.57 ton ha^-1) were significantly increased due to the addition of 168 kg N ha^-1 followed by 13.62 and 13.18 ton ha^-1 with 144 kg N ha^-1 in the first and second seasons, respectively. The highest grain N content values (93.88, 101.5 and 93.29, 102.33 kg N ha^-1) were obtained with M₃ with and without cyanobacteriain the first and second season, respectively.  The highest mean values of P content in the grain (12.57 and 13.27 kg .ha^-1) were obtained with N level of 168 kg N ha^-1 compared with 12.59 and 11.95 kg P ha^-1 with 144 kg N ha^-1. Spraying micronutrients high significantly affected available N and P in the soil. The highest available N values were observed in both seasons with N₂, M₃ and C₀ treatments. The mean value of NUE was decreased by increasing of N level. The micronutrients affected NUE in both N level and cynobacteria treatments as the order: M₃ > M₂ > M₁> M₀.