Two field experiments were conducted at the village (7) in Gelbana, North Sinai Governorate, Egypt during two successive winter seasons of 2013/2014 and 2014/2015 to study the response of sugar beet (Mirodor) grown on saline sandy loam soil to study the interaction effect of compost, (CO) amendment and foliar spraying with micronutrients (Zn and B) solely or in combinations on some growth parameters, productivity and nutrients content in sugar beet roots. The obtained results reveal that CO and foliar application with Zn and B enhanced the growth and yield productivity of sugar beet roots as well as nutrient contents. Available N, P, K, Fe, Mn, Zn and B contents were increased due to the above mentioned treatments. On the other hand, the electrical conductivity (EC dSm-1) and soil pH values decreased due to these treatments. Foliar spray with micronutrients in combination with CO substantially elevated these parameters N, P, K, Fe, Mn, Zn and B contents in roots were significantly increased by application of the treatments. The highest response of productivity and nutrients content in root were achieved by application of CO in combination with foliar spray of Zn + B followed by foliar spray of Zn + B in both seasons. Highest values of yield, yield components, nutrient contents and sucrose percent as well as sugar yield were obtained due to the application of compost at rate of 5 Mg fed.-1 + foliar spray with Zn + B in both seasons.

A field experiment was conducted at the Ismailia Agricultural Research Station during the two growing seasons of 2008-09 and 2009-10, to study the separate application of biofertilizers, organic manure (0, 5, and 10 tons/fed) and mineral Nfertilizer (0, 40, 60, and 80 kg N/fed) and their combined application on plant growth, yield and its components, seed quality (oil and protein content) of canola plants (c.v. Serw 4). Split-spilt plot design with three replicates was used. Results indicated that the individual application of biofertilizer, organic manure (10 ton/fed) and N-fertilizer at rate 80 kg N/fed caused 5.1 and 4.9 %, 18.5 and 16.6% and 40 and 40.3 % in seed yield during two seasons, respectively over control. Likewise, the interaction among the used levels of mineral N-fertilizer and bio-organic fertilizer revealed significant effect in both studied seasons for all investigated characters of canola plants. In this respect, it is worthy to note that the treatment of 80 kg N/fed of the recommended dose of N did not statistically differ from that of 40 kg N/fed of N fertilizer plus biofertilizer and 10 tons/fed compost manure. As for seed quality of canola, it was also found that protein content was increased by application of bio, organic, and inorganic N-fertilizer. However oil content was decreased by nitrogen application but it was increased with addition of biofertilizer and compost manure. Seed protein and oil content were significantly increased by the integrated fertilizers applications. This mean that inoculated seed of canola plant with biofertilizer containing nitrogen fixer bacteria plus addition of compost manure at 10 ton/fed., substitute half of the recommended dose from the used mineral nitrogen fertilizer.

Two field experiments were performed at the Experimental Farm at Ismailia Agricultural Research Station, Egypt ARC during two growing winter seasons 2020/2021 and 2021/2022to study the integrated effect of inorganic K-fertilizer (KS) and natural feldspar (KF) in combination with silicate dissolving bacteria (SDB) as bio-fertilizer on growth, yield and nutrient NPK uptake for canola plant (Brassica napus L. serw 4). The results indicated that with all growth studied characters, adding 75% KS + 25% KF application plus seed inoculation with SDB had a positive and significant increase in growth characters i.e. No. of pods/plant, No. of branch /plant, and give a relative increase in seed and straw yields 98.9 and 99.8 %, respectively compared with the 100% individual inorganic K-fertilizer. Also, the combined treatment of 75% KS + 25% KF + SDB recorded insignificant increases in oil and protein contents as well as NPK uptake in both seed and straw for the canola plant. Conclusively, the same combined treatment (75% KS + 25% KF + SDB) can be recommended to improve growth, yield and chemical composition for canola plants in sandy soil and also, the utilization of natural K-feldspar led to reducing the high cost of chemical fertilizer and minimizing the environmental pollution.

Two field experiment were conducted at Ismailia Experiment Research Station, Ismailia Governorate, Egypt during the two successive seasons of 2015 and 2016 to evaluate the effect of different rates of compost application (0, 12.5 and 25 Mg ha -1 ), gypsum at rates of (0, 0.6 and 1.2 Mg ha -1 ) and Ca-foliar (300 mg L -1 ) and its combination application on yield and quality of peanut grown in a sandy soil. Application of compost significantly increased pods and grain yield, shelling percentage and 100 grain weight of peanut as compared to control. The increases were 29.6 and 35.4 % for pod and 35.5 and 41.40 % for grain due applications of 12.5 and 25 Mg ha -1 compost. Application any of the two gypsum rates increased pods, grain yield, shelling percentage and 100 seed weight with non-significant difference between two rates. Addition any of the two rates of compost significantly increased N, K, Fe, Zn and Mn contents of straw and seed. Two rates of gypsum also increased the same nutrient with non-significant difference between two rates. Oil and protein contents of grain significantly increased due to application of compost and /or gypsum.

Two field experiments were conducted during the two early winter