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.

Two field trials were conducted at El-Serw Agricultural Research Station, Dammietta governoratethrough summer season 2014 and 2015, to study the effect of organic matter as compost (20 m 3 .fed -1 ) (hectare = 2.4 fed), sulfur fertilization (0, 10, 20 and 40 kg S fed -1 ) and zinc fertilization (0, 4, 8 and 16 kgZnfed -1 ) on rice grain and straw yield, N, P and K uptake for rice crop (Oryza sativa), variety Giza 178. The results showed that rice grain and straw yield and N, P and K-uptake in grain and straw increasing with the use of zinc fertilization rates up to 16 kg Znfed,. As well as the results showed that 40 kg S fed -1 , 20 and 10 kg S fed -1 of sulfur fertilizers, respectively gave the highest values of the previous parameters. Also, the results showed that the use of organic matter as a compost gave the highest values of the previous parameters for rice crop. Organic matter + 40kg S fed -1 + 16 kg Znfed -1 gave high rice grain and straw yield and N, P and K-uptake in grain and straw.Therefore,it preferably add zinc (16 kg Zn fed -1 in form ZnSO 4 ) and mineral sulfur fertilization (40 kg S fed -1 ) with organic fertilizer to produce high rice crop under saline soil in North Delta.

Effects of different fertilizers types, i.e., mineral fertilizers (100 % as a control) or 30 % combined with organic fertilizers (farmyard manure at 20 or 30 m 3 / fed), bio-fertilizer and foliar application of humic acid on vegetative growth, yield and some nutrient contents of Caraway plant (Carum carvi L.) were studied at the Experimental station of Faculty of Agriculture, El-Mansoura University during the two growing seasons of 2016 and 2017. The results indicated that the highest mean values of the vegetative growth and fruit yield parameters of caraway plant were significantly increased when plants received 30 % of the recommended mineral fertilizer combined with farmyard manure at 30 m 3 / fed in the presence of bio-fertilizer and sprayed with humic acid as compared with control (NPK at 300, 200 and 50 kg/ fed, respectively). In addition; N, P and K percentage in herb and seeds recorded the highest values with the same previous treatment. While, the highest values of NO 3 -N concentration in herb and seeds was obtained with full recommended dose of mineral fertilization (control treatment).

TO STUDY the effect of potassium and nitrogen fertilization treatments on wheat yield, P & K uptake and P & K utilization efficiency for wheat (Triticum aestivum, L.), variety Sakha 93, two field experiments were conducted on a clay saline soil at El-Serw Agricultural Research Station, Agricultural Research Center, Egypt during 2011/2012 and 2012/2013 winter seasons. The experiments were carried out in a split plot design with four replicates. Main plots were assigned to potassium applications (0, 47.4 & 94.8 kg K ha-1). The sub plots were divided by mineral nitrogen treatments as follows: 44.5, 89, 133.5, 178 and 214 kg N ha-1. Wheat yield (grain & straw) and P & K-uptake by (wheat grain & straw) increased with increasing potassium rate up to 94.8 kg K ha-1 , but P & K utilization efficiency by wheat crop was decreased. Also, these results showed that 214, 178, 133.5, 89 and 44.5 kg N ha-1 , respectively gave the highest values of the previous parameters except the PU t E and KU t E, where the order of values was upward with the order of the previous treatments. The interaction between 94.8 kg K ha-1 and 214 kg N ha-1 gave the highest wheat yield (grain & straw) and P & K uptake by grain and straw and gave the lowest PU t E and KU t E in both seasons. So, it is preferred to add 94.8 kg K and 214 kg N ha-1 to economic production of wheat grain and straw especially in saline soil. Also, the highest results of PU t E and KU t E in both seasons were obtained with interaction between 0 kg K ha-1 and 44.5 kg N ha-1 , it indicates shortages in uptake of phosphorus & potassium with nitrogen & potassium deficiency.