ROLE OF BIOFERTILIZATION AND DIFFERENT RATES OF NITROGEN WITH FOLIAR SPRAYING OF NITROGEN AND YEAST IN RICE PRODUCTIVITY AND NUTRIENT UPTAKES.

Field experiments, on rice crop (oryza sativa l. c.v. giza 178) grown in meet louza village, mansoura province, dakahlia governorate, egypt were conducted in 2008 and 2009 seasons on a silty clay soil. biofertilization 8 treatments involving inoculums of azolla (azl), azospirillum (azs), azotobacter (azt), and cynobacreria (cyn) as well as mixtures (azl + azs), (azl + azt) (azs + azt) and (cyn + azt), soil n-fertilization (4 treatments of no-n, portions of 50 %, 75 % and 100 % of n-recommended level of 60 kg n fed-1 as urea), and foliar spray of (2 treatments of yeast extract only, and yeast extract + 2 % n) were tasted in a randomized complete block design (factorial) involving the 3 above mentioned factors. execution of experiment was a split- split plot with three replicates. the highest grain yields of (3.99 and 4.07 metric t fed-1) in 1st and 2nd seasons occurred with the treatment of (cyn + azt) + 50 % n-level + (2 % n + yeast). the highest straw yields were given by (cyn + azt) + 100 % n-level+ yeast which gave 3.94 metric t fed-1 in 1st season, or by (cyn + azt) + 100 % n- level+ (2 % n + yeast) which gave 4.10 metric t fed-1. the highest weight per plant (at booting stage) was due to (azs + azt) + 50 % n-level + (2 % n + yeast) which were125.14 and 137.65 g dry matter plant-1 in 1st and 2nd seasons, respectively. the highest n-uptake by grains of 59.84 and 66.62 kg fed-1 for 1st and 2nd seasons, respectively occurred with (azl) + 100 % n-level +(2 % n + yeast). the highest p-uptake by grains occurred with (azl + azt) + 50 % n-level (2 % n + yeast) which gave (7.51 and 9.46 kg fed-1) in 1st and 2nd seasons, respectively. the highest k-uptake occurred with (cyn + azt) + 50 % n-level + (2 % n + yeast) which gave 12.76 and 14.62 kg fed-1 in 1st and 2nd seasons respectively. the highest fe-uptake of 259.89 and 308.44 g fed-1 in 1st and 2nd seasons respectively, were given by (azs + azt) + 75 % n-level + (2 % n + yeast). the highest mn-uptake of 185.36 and 214.18 g fed-1 in 1st and 2nd seasons respectively occurred with (cyn + azt) + 100 % n-level + (2 % n + yeast). the highest zn-uptake of 151.52 and 171.52 g fed-1 in 1st and 2nd seasons, respectively occurred with (azl + azs) + 50 % n-level + yeast.