The present study was carried out at the experimental farm of Tag El-Ezz Agricultural Research Station (30 o 59 \ N latitude, 31 o 58 \ E longitude´), Agricultural Research Center, Dakahlia Governorate, Egypt, to study the effect of foliar spraying of arginine on four soybean cultivars under salinity stress. This experiment was laid out in a split plot design with three replicates during the two successive summer seasons of 2020 and 2021. The main plots were occupied by four soybean cultivars (Giza 111, Giza 21, Giza 35 and Crawford), while subplots contained arginine treatments i.e. without spray (control), spray with arginine at 200 and 300 mg l -1 . The obtained results showed that, cultivars showed a wide range of variation in their salinity sensitivity where, Giza 111 gave the highest values of the most vegetative growth parameters i.e., chlorophyll content, relative water content (RWC%), nutrients content in leaves, proline content as well as catalase and peroxidase enzymes activities, thus increased seed yield, seed nutrients, protein, carbohydrates and oil %. Concerning, foliar spraying of arginine ameliorate inhibitory effect of salinity on soybean cultivars in comparison to the control. The highest values of most studied vegetative growth parameters, yield and yield components were achieved by foliar spray of arginine at 300 mg l -1. The interaction between soybean cultivars and foliar spraying of arginine revealed that, Giza 111 treated with arginine at 300 mg l -1 gave the highest values of growth, yield and yield components.

Two field experiments were carried out as split-split plot design at Experimental Farm of Tag El-Ezz, Agricultural Research Station (30 o 59 \ N latitude, 31 o 58 \ E longitude´), Dakahlia Governorate, Egypt, during winter seasons of 2018-19 and 2019-20 to study the integration managements of N and S fertilizers as three nitrogen sources in main plots as (urea(Ur), ammonium nitrate(AN) and ammonium sulfate(AS)), two elemental sulfur(ES) treatments (without and with sulfur as a soil application) in sub plots as well as in addition to three amino acids(AA) treatments (control, L-methionine and L-cysteine) as foliar application in the sub-sub plots on growth, yield and its components of onion plants (Allium cepa L.) cv.Giza Red(GR) were studied. Available elements N,P,K and S in the experimental soil were determined before cultivation and after harvesting. The obtained results could be summarized as follow: AN fertilizer give the highest effective vegetative growth values, quality parameters, yield and its components compared to other nitrogen sources. Soil application of ES has a significant effect on all studied parameters, while L-methionine is more effective than L-cysteine. Interaction of AN and foliar application of methionine in integration with ES application achieve the highest values of vegetative growth criteria, quality parameters, yield and its components of the onion plants. Highest residual NPK concentration in the soil were recorded with the interaction of AS and without ES and AA application, while the highest values of residual S are obtained by the interaction of AS and methionine foliar application in presence of ES application.

Two field experiments were conducted at the Experimental Farm of TagEl-Ezz , Dakahlia governorate (30° 59\\ N latitude, E 31° 58\\ longitude) ,ARC, Egypt during the two growing summer seasons of 2020 and 2021 as sake of studying the possibility of partially substituting for the amount of inorganic NPK fertilizers required for maize plants using compost and/or vermicompost and their effects on growth, yield and nutrients uptake of maize plants (Single cross 10 variety) under the alluvial soil conditions. Experiments were laid out in split plot design with three replicates. However, main plots were affected for four rates of inorganic NPK fertilizers i.e.; without, 50%, 75% and 100% of the recommended dose (RD)) whereas, four organic fertilizers namely without, compost (C); (5 ton fed-1), vermicompost (VC); (0.5 ton fed-1) as well as half compost and half vermicompost (mix)) were randomly distributed in the sub plots. Results showed that: 1-Application of inorganic NPK fertilizers at 100% RD recorded the highest values of growth parameters, yield and nutrients uptake by maize grains in the two investigated seasons 2-Using organic fertilizers i.e. compost and /or vermicompost caused a significant effect on all growth parameters, yield and nutrients uptake. In this respect, V.C. attained the superiority impacts followed by mix and lately C compared with control (without adding NPK fertilizers). 3-The addition of inorganic NPK fertilizers at 100% RD and organic V.C. had positive impacts on maize growth parameters, yield and nutrients uptake better than the application of inorganic NPK fertilizers at 100% RD singly under the two investigated seasons. 4-Dual application of inorganic NPK fertilizers at 100% RD and organic C treatment application achieved the highest values of available NPK in the soil post harvesting. 5-Economically using inorganic NPK fertilizers at 75%RD and C recorded the highest net return and benefit cost ratio (BCR). So, it could be a good alternative to other treatments, save 25% of inorganic NPK fertilizers and viable option for enhancing crop yield and farmers income.

Two field experiments were carried out at Experimental Farm of Tag El-Ezz Agricultural Research Station (30 o 59 \ N latitude, 31 o 58 \ E longitude´), Agriculture Research Center, Dakahlia Governorate, Egypt. Split plot design with three replicates was used during the two successive winter seasons of 2018/19 and 2019/20 to study the effect of four phosphorus fertilizer sources (without addition, super phosphate (SP), phosphoric acid (PA) and di ammonium phosphate (DAP)) as the main plots and four organic acids treatments (control, citric acid (CA), salicylic acid (SA) and ascorbic acid (ASA)) as foliar application in the sub plots on growth, yield and its components of faba bean plants (Vicia faba L.) cv. Giza 716 which grown under salt affected soil. Available elements N, P and K in the experimental soil were determined after harvesting. The obtained results could be summarized as follow: DAP gave the highest values of vegetative growth, yield and its components compared to other phosphorus sources. ASA as a foliar application has a superior effect on all studied parameters compared to the other foliar treatments. The interaction between DAP and ASA achieves the highest values of vegetative growth criteria, yield and its components of the faba bean plant. The highest residual N, P and K (mg kg -1 ) in the soil were recorded with the interaction of SP and CA application comparing with the other phosphorus fertilizers and organic acids treatments. The highest P use efficiency values were obtained by the combination of PA and ASA foliar application.