Two field experiments were carried out at the experimental farm of El-Ismailia Agric. Research station, during two successive winter seasons of 2007/2008-2008/2009 to study the effect of different levels of nitrogen fertilizers 0,25, 50, 75 and 100kg N/fed. from recommended dose (100kg/fed) with or without composted rice straw and / or humic acid on yield, yield components, chemical composition of wheat plant and its attributes as well as NPK uptake of wheat grain and straw, and protein content. A three way randomize complete block (Factorial) design with three replicates was used. The obtained results could be summarized as follow;-1-Raising mineral nitrogen fertilizer level from 25 to 50, 75 and 100 kg N/fed resulted in significant increases in plant height, spike length, grain and straw yields/fed and protein content of grain and straw. Also, NPK uptake of grain and straw were significantly increased. 2-The wheat grain and straw yields as well as their NPK contents and grain protein were significantly increased by application of compost and humic acid treatments. 3-Raising the nitrogen rate along with compost application increased the quantity and quality of wheat yield. 4-Addition of humic acid markedly increased plant height, spike length, 1000-grain weight, grain and straw yield/fed., protein content of grain, NPK uptake of both grain and straw. 5-The interaction between compost, mineral nitrogen level and humic acid had significant effects on grain yield/fed. and N,P and K uptake of straw and 1000-grain weight. 6-The highest values for yield and its components were obtained by humic acid, under the highest level of nitrogen fertilizer and compost treatment. Therefore, it could be concluded that the application of compost+ 100 kg N/fed + humic acid was the most compatible and economical, since it has the highest wheat yield.

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growth, yield and its components, as well as chemical constituents in cloves and bulb storability of garlic (Allium sativum L.) cv. Sids-40 under three levels of nitrogen (90, 120and 150 kg N/fed) and four levels of elemental sulphur (0, 50, 100 and 150 kg S fed -1).The experiment was laid out in split plot design with three replications assigning nitrogen levels in the main plots and sulphur levels in sub-plots. The results of this study revealed that application of nitrogen and sulpher and their combinations had significant effects on most of the studied characters. The maximum plant height (80.91cm), leaf number (11.96), bulb diameter (6.40cm), and number of cloves per bulb (21.33) and bulb yield (8980 kg fed -1 ) were observed with N 150 S 150 treatment. While the minimum plant height (52.64cm), leaf number (7.91), weight of bulb (58.40g) and projected yield (6620 kg fed -1 ) were observed under N 09 S 0 treatment. S at 150 kg fed -1 and nitrogen at 90 kg/fed recorded the minimum physiological loss in weight (%) for garlic during the storage period (6 monthes). However increasing nitrogen and decreasing sulphur level had adverse effect on storability of bulbs. Sulphur fertilization increased the Allicin concentration from 13.87mg g -1 in the control treatment to 26.59mg g -1 dry weight at 150 kg S fed -1 after 2 weeks of storage period. Allicin decreased gradually in the garlic cloves during the storage period (12 weeks).

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Two field experiments were conducted at El-Kassasin Farm, Ismailia Governorate, Egypt, (30º 33 ‫13״‬ ‫׳‬ N-30°56 ‫7״‬ ‫׳‬ E, elev. 15.8 m) during the summer seasons of 2014 and 2015 on maize plants (c.v. single hybrid 30K8) grown on a sandy loam soil to study the effect of applying different sources of N-fertilization alone and in combination with foliar application of humate potassium on yield and its components and quality of maize grains. Different sources of N-fertilization caused significant increases in yield and its components and mineral uptake. Meanwhile, application of 50% N-mineral as ammonium sulphate (75kg N fed.P-1 P) +50% organic N (75 kg N fed.P-1 P) (5.3 t compost fedP-1 P) achieved the highest values of all aforementioned parameters followed by the application of 100% of the recommended mineral N (150 kg N/fed.) then 100 % organic N (150 kg N fed.P-1 P) (10.6 t compost fedP-1 P), in a descending order. Spraying maize plants with potassium humate significantly enhanced plant growth, yield and its components as well as N, P and K uptake, total protein and oil in grains. In this respect, spraying plants with 4 L/fed potassium humate attained the superiority impacts comparing the other treatments. Hence, it can be concluded that fertilizing maize plants with 50% N-mineral (75 kg N fed.P-1 P) +50% organic N (75 kg N fed.P-1 P) (5.3 t compost fedP-1 P) in combined with spraying plants at rate 4 L/fed potassium humate gave the highest values of yield and its components and NPK uptake as well as protein and oil content in grains as compared to other interaction treatments.

Egypt, located at lat. 30° 35' 30" N, long. 32° 14' 50" E. during two successive summer seasons of 2013 and 2014, to study the effect of partial replacement of mineral N fertilizer by organic or bio-fertilizers on soil microbial activities, some seed macro nutrients content , growth characters, yield and yield components of peanut. Results of this study showed that inoculation with cyanobacteria enhances the soil biological activity in terms of increasing the total bacterial, total cyanobacterial counts, CO 2 evolution, dehydrogenase and nitrogenase activities. Combined inoculation of cyanobacteria at 20 or 30L/fed with 50% of the recommended mineral N + 50% as organic N gave the highest nitrogenase and dehydrogenase activities and CO 2 evolution in rhizosphere as well as the macro nutrient content in seeds of peanut plants. The highest significant increases for all growth characters, yield and yield components of peanut were also recorded by the same treatment.

Two field experiments were carried out during the summer seasons of 2013 and 2014 on maize plants (c.v. single hybrid 30K8) grown on a sandy loam soil at Elkassasin, Farm(30º ‫׳33‬ ‫״13‬ N-30° ‫׳65‬ ‫״7‬ E, elev. 15.8 m), Ismailia Governorate, Egypt, to study the effect of FYM (0 and 10 m 3 /fed), P (15, 30 and 45 kg P2O5/fed) and Zn as foliar spraying (0 and 100 mg Zn/L) and their combinations on growth, yield and its components as well as grain quality of maize. The experiments were laid out in a split-split plot, arranged in a randomized complete block design with three replications. The obtained results showed that application of FYM significantly increased the yield, yield components as well as some grain mineral contents and grain quality. All the studied characteristics were significantly affected by P-fertilizer. Application of P at the rate of 30 kg P2O5/fed resulted in the maximum plant height (250.75 cm), cob weight (306.08g), 100-grain weight (43.50 g), grain weight/ear (255.44 g), grain yield (3769.25 kg/ fed) and protein yield (478kg fed-1) as compared with the other P-fertilizer rates .Foliar application of zinc led to significant response of all studied characteristics. Application of FYM, p-fertilizer and foliar spraying of Zn in combination gave the best yield, yield components as well as some grain mineral contents and grain quality. Therefore, it could be concluded that the application of 10 m 3 FYM/fed +30 kg P2O5/fed + foliar spraying of Zn (100 mg Zn/L) is the best formula for achieving the best crop and improving yield quality.

A two field experiments were carried out during the two successive growing