The experiments were carried in clay soil at the Experimental Farm of Faculty of Agricultural, El-Mansoura University, Egypt, to investigate the effect of foliar application with yeast and ascorbic acid on plant growth, yield and quality of eggplant (Solanum melongena L.) under different levels of NPK fertilization. Vegetative growth measurements (plant height, No. of leaves/plant, No. of branches/plant, fresh and dry weight), yield (fruits length, fruit diameter, No. of fruits and total yield), N, P, K and chlorophyll content as well as quality of fruits (C.protien, T.carbohydraties, D.faiber, V.C and V.A) were recorded to study the effects. As for, parameters of eggplant as affected by application of NPK fertilization there were a significantly increase with increasing rate of NPK from 50 up to 100% of the recommended dose then decreased with 150% NPK. The highest significant values of the aforementioned parameters were recorded with spraying plants by yeast extract (5 g/L.) comparing with the untreated plants. It could be observed that eggplants supplied with 100% NPK fertilization and foliar application of yeast gave the highest significant values of parameters under study.

HE PRESENT study was conducted at the Experimental Farm of the Faculty of Agric., Mansoura University. Six treatments were arranged in Randomized Complete Block Design with three replications as follows: 50% and 100% from the recommended doses (RD) of NPK, 300 Fe mg L -1 + 50% from RD of NPK, 50 Cu mg L -1 +50% from RD of NPK, 100 Zn mg L -1 + 50% from RD of NPK and Fe + Cu + Zn + 50 % from RD of NPK. Micronutrients were added as foliar application while NPK as soil addition. Obtained results indicated that all treatments under investigation significantly affected all traits. The highest values of vegetative growth parameters including fresh, dry weight of bulb and total yield as well as N, P, K, Cu, Fe and Zn, beside nitrate reductase activity in onion bulb recorded with using 50% NPK as soil addition and foliar application of (Fe + Zn + Cu). NO 3 -N and NO 2 -Nin onion bulb also recorded the highest mean values with the untreated plant (control). The highest availability values of N, P and K in the soil after harvesting were recorded in case of the addition of Fe + Cu + Zn + 50% RD from NPK.

At the Experimental Farm of Faculty of Agriculture, El-Mansoura University, Egypt, a field experiment was carried out, to investigate the effect of zinc and iron individually or mixed as foliar application on cowpea plant growth, chemical composition, yield and its components as well as availability of nutrients in the soil, all that under phosphorus application effect. The experiment was laid out in split plot design with three replicates, assigning twelve treatments consisting of three levels of phosphorus (50, 100 and 150% from recommended dose) as main plot, and four levels of micronutrients foliarly (without, Zn, Fe and Zn+Fe) as sub plot. As for the effect of P-fertilization, the results show that all treatments significantly increased vegetative growth (plant height (cm), no. of branches/plant, no. of leaves/plant), yield and its components (No. of pods/plant, No. of seed/pod, 100 seed weight g and Seed yield Kg/fed.) as well as chemical (N, P, K, Zn and Fe) and quality composition (chlorophyll content, c.protien, T. carbohydraties and C. fiber.). These effects were more obvious especially at higher concentrations of these treatments 150% RD except chlorophyll content, quality parameters with 100% RD. The highest mean values of available P, Zn and Fe in the soil were recorded for the plants treated with P-fertilization at the rate of 100% from recommended dose, whereas the lowest values of available N and K were realized for the same treatment. On the other hand, foliar application with micronutrient has a significant effect on cowpea growth. The highest values of parameters observed with the mix of (Zn+Fe) comparing with the untreated plant. Moreover, the mix of micronutrient (Zn+Fe) recorded the highest values of available P, Zn and Fe, whereas the highest values of available N and K were recorder with the untreated plant. The interaction effect between P fertilization and micro nutrients show a promotive effect on growth parameters with using mix of Zn+Fe. The highest mean values of parameters was recorded under 150% P from RD, whereas the highest mean values of chlorophyll content, quality parameters and available P, Zn and Fe recorded with 100% P from RD and the lowest values of available N and K were realized for the same treatment.

Soils degraded physically and nutritionally due to continuous use of chemical fertilizers under intensive agricultural. Management of N is the key for sustainable and profitable wheat production in a low N-soil availability. So a field experiment was conducted on a clay soil using wheat (Triticum aestivum) Giza 168 variety during 2008 / 2009 season at Agricultural Experimental Station of Fac. Agric, Mansoura Univ., to study the influence of combined use of mineral fertilizers (urea) and organic fertilizers in the form of farmyard manure (FYM), composted rice straw (CRS) and their combinations on wheat productivity, nutrients availability and monitoring soil organic matter (SOM) status in soil at certain times 45, 88 and 155 days from wheat planting. The randomize complete blocks design with three replications was used. The mineral fertilizer (urea) was applied at the rate of N1=60 and N2=120 kg urea fed-1 .The amounts of various organic fertilizers used were (10 and 20 m 3 fed-1), for both FYM and CRS. Organic fertilizers added either alone or in combinations with urea to the soil. Results indicated that the maximum increase in grain yield (54.66 and 56.55 % over untreated control) and straw yield (1660.50 and 1710.99 g.m 2) were recorded with N2FYM2 and N2CRS2 respectively. All combination of organic (FYM or CRS) and inorganic fertilizers gave the optimum availability of NH4 + , NO3-, P, K concentration in soil beside the enhancement of soil organic matter percentage (SOM) as compared to the other treatments.

FIELD experiment was carried out at the Experimental Farm of the Faculty of Agric., El-Mansoura Univ. during season 2015, arranged in split block design with 3 replicates to evaluate the effect of 3 rates of NPK treatments (50, 100 and 150 % from recommended dose) as main plots and 4 levels of sodium selenite in a foliar way (0, 10, 20 and 30 mg kg-1) as sub plots. Results indicated that NPK fertilization up to 100 % under study significantly increased the average values of chlorophyll, fresh and dry weight, and total content of N, P and K as well as soluble and insoluble oxalate concentrations in spinach leaves as compared to the untreated plants. More addition of sodium selenite foliar application of sodium selenite at the lowest rates of 10 and 20 mg L-1 significantly increased the aforementioned traits while at the highest rate (30 mg L-1) significantly reduced the average values of all the previously mentioned traits. Also, the results indicated that, the mean values of total phenolic compounds, Se accumulation in leaves as well as the activity of nitrate reductase enzyme were significantly increased with the level of sodium selenite increasing. Such effect was realized under all the forms of NPKfertilizers. An adverse effect happened for the values of nitrate and nitrite accumulation in spinach leaves. It decreased sharply and significantly with increasing selenite level under all the investigated treatments. Obtained results proved that the foliar application of sodium selenite at the lowest levels (10 and 20 mg L-1) in combination with soil application of combined with NPK fertilization up to 100% is considered to be the most suitable treatment for all previous traits.