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A pot experiment was conducted at El-Mansoura laboratory of plant nutrition; Agric. Res. Center, during the tow seasons of 2008 and 2009 In order to evaluate the effects of Azotobacter inoculation with and without organic and mineral fertilization on yield and chemical composition of tomato plants.A factorial experiment in the form of complete randomize block design with three replicates has been used. NPK fertilizers were added at the 0,50,75 and 100% of the recommended dose for tomato crop once with inoculation by Azotobacter and the other without inoculation. All treatments were investigated in the presence and absence of organic manure (FYM) giving a total of 16 treatments. Results revealed that inoculation of tomato seedlings with Azotobacter sp. in combination with the rates of NPK fertilizers either with or without FYM significantly gave higher magnitudes of plant growth, yield and its component and chemical composition parameters than the uninoculated treatments. Raising NPK applied levels to 100% of the RD gave insignificant difference during both seasons. In addition, stimulation effect was happened due to using FYM combined with the same rates of NPK fertilization either in the presence or absence of Azotobacter inoculation but the rates of increases over the control treatment were more pronounced during both seasons. The intermediate levels of NPK; 50%+Azotobacter+FYM, seemed adequate and was associated with the highest mean values for the previously mentioned traits.

two successive seasons (2009-2010 and 2010-2011) to investigate the influence of two levels of phosphorus (P1, P2) and potassium (K1, K2) in combination with nitrogen (N) with or without activated mixed fertilizer dose(D1&D2 respectively) on leaf area, relative water content and photosynthetic pigments content of flag leaf during tillering, heading and anthesis growth stages as well as yield attributes and biochemical aspects of the yielded grains of wheat plant grown in both clay and loamy soils. In wheat plants grown in clay soil a significant value of all studied characters were recorded in response to combination of lower phosphorus concentration, higher potassium concentration (P2K1) and nitrogen without activated dose. While, in loamy soil these characters were linearly increased in wheat plants treated with combination of higher phosphorus concentration and lower one of potassium (P1K2) and nitrogen without activated dose.

A field experiment was conducted at the experimental farm of Faculty of Agric.; El-Mansoura Univ. during the winter season of 2011-2012 to investigate the various combinations among organic manures, growth regulators and biofertilizers on the production of safe and economic onion bulbs. Twenty four treatments were arranged in complete randomized block design with 3 replicates as follows; 1-Farmyard manure (FYM), 2-FYM + humic acid (HA), 3-FYM + cytokinin (CK), 4-FYM + yeast (Y), 5-Compost rice straw (CRS), 6-CRS + H.A, 7-CRS + CK , 8-CRS + (Y), 9-Compost town refuse (CTR), 10-CTR + HA, 11-CTR+CK, 12-CTR+Y. All treatments were studied twice; one in the presence of a mixture of multi strains inoculants and the other without it. Also, the recommended doses of N, P and K fertilizers for onion were put in consideration as a control treatment. Thus, the total numbers of treatment were 25 treatments. Results revealed that; the application of organic manures under investigation gained less vigor plant growth, total bulb yields and its components and nutrient content of onion bulbs as compared to the application of inorganic fertilizers (N,P and K at RD). Within the organic manure sources; the best parameters were attained by onion plants receiving CRS followed by that supplied with FYM and lately CTR. Inoculation of onion seedlings with the mixture of multi strains inoculants in combination with the growth regulators studied and the various organic manures under this investigation gave higher magnitude for all studied parameters than the application of organic manure alone. Moreover, such effect of this interaction gave, approximately the same values of inorganic fertilization for all the aforementioned traits.

Two field experiments were conducted at Qalabshu, Agriculture Research Station, during two successive seasons of 2006/2007 and 2007/2008. The work aimed to study the response of faba bean plant to inorganic & organic-N and its combined fertilizers with some compounds as foliar applications on growth, yield and mineral composition. It was found that :-1 The foliar application of (N, P and K ) gave the highest mean values for yield with mixed plots (25% of mineral + 25% of FYM both of recommended doses), but the effect of inorganic & organic-N and their combined gave the equal mean values of phytic acid concentrations with N, P and K foliar application treatment. 2-The inorganic-N Fertilization (100% mineral of recommended dose , 8 kg N/fed) gave the highest mean values of N and K -uptake, but the combined Fertilization gave the highest mean values of P-uptake with N,P and K foliar application treatment. 3-The inorganic-N fertilizer gave the highest mean values for Fe-uptake, but the organic-N fertilization (100% of FYM of recommended dose , 10 ton/Fed) gave the highest mean values for Zn, Mo and Co-uptake, in contrast, the combined Fertilizers gave the highest mean values for Mn-uptake, obtained with N.P and K foliar application treatment, except Co-uptake for the B, Mo and Co foliar applications treatment.From these discussion , it could be concluded that the inorganic & organic-N and the combined Fertilization with the (N,P,K ) treatmeants as foliar application are important for obtaining a high and good quality in yield and its components, while, decreased phytic acid in seeds as the result of using yeast as fertilizer .