Two field experiments were conducted on Gadila village, Mansoura city, Dakahlia Governorate during the two successive summer seasons of 2017 and 2018 as sake of studying the impact of some methods of potassium humate (KH) application along with nine mixtures of NP fertilizers on soybean plants . split plot design was used where KH application methods and NP mixtures were put in the main and sub plots, respectively. Addition of KH generally had enhancing impacts on soybean growth , seed and stalk yields as well as improved seed nutritive and biochemical contents. Foliar spraying of KH achieved the maximum values followed by seed coating and control in a descending order. Soil application of (100 % N + 100 % P) mixture attained the best results for all aforementioned characteristics with no significant difference between it and (75 % N + 100 % P) mixture. Foliar spraying of soybean plants with 2% KH solution (10% K2O) in a volume of 200 L fed -1 at 30 and 45 days after sowing and soil application of (75 % N + 100 % P) of the recommended doses, in a dual treatment achieved the superior impacts and recorded the highest values of plant growth criteria, productivity as well as improved seed quality characteristics and saved 25 % of N requirement for soybean plants.

Two field experiments were conducted at a private farm on Gadila Village, Mansoura City , Dakahlia Governorate , Egypt under alluvial soils of Nile delta, during 2017 and 2018 summer growing seasons as sake of studying the effect of potassium humate (KH) sprayed singly or in dual,triple and quadruple combinations (9 mixtures) with some micronutrients(Fe , Mn and Zn )on leaves photosynthetic pigments ; yield and yield attributes as well as nutritive and biochemical contents of sesame seeds. KH and micronutrients were sprayed; once , at 21 days after sowing (DAS) ; twice, at 21 and 35 DAS and triple, at 21 , 35 and 50 DAS. So ,a split plot arrangement with three replications was used , where number of foliar spraying times for both KH and micronutrients were allocated in the main plots however , nine treatments of different combinations of KH and micronutrients were randomly distributed in the subplots . The highest values for all traits mentioned before were attained upon foliar spraying of sesame plants, triple compared to those sprayed twice and once, respectively. Spraying KH and micronutrients simultaneously in a quadruple combination i.e.( KH + Fe + Zn + Mn )also gave the best values followed by their additions in triple ,dual combinations however, spraying of KH alone achieved the least values . Therefore , spraying sesame plants with( KH + Fe +Zn +Mn )three times achieved the highest increments for all criteria under investigation related to the quantity and quality of sesame .

Two field experiments were performed at a private farm on the town of EL-Serw, Al-Zarqa region, Domiate Governorate, Egypt (Latitude 31 o 12 \ N; Longitude 31 o 37 \ E) during the spring seasons of 2017 and 2018 on March 1 st for the two seasons. The main targets of these experiments were to raise the productivity of squash fruits as well as improve its nutritive content and quality characteristics. Split plot design with three replicates was used where K-treatments i.e 0, 62.5 and 125 Kg K2O fed-1 were allotted to the main plots however, sub plots were comprised of different foliar spraying treatments of Mn namely 0, 0.3 and 0.6 g L-1. Data obtained revealed the following important topics : 1-K-soil application and foliar spraying of Mn had synergistic impacts on squash vegetative growth characteristics, yield and yield components as well as nutritive content and quality characteristics of squash fruits, except crude fiber and total phenol. Differences between either K levels or Mn ones for all abovementioned parameters were significant and treatments of K2 and Mn2 achieved the highest values. 2-Additional positive effects were observed when the addition of K and Mn simultaneously. In this concern, the best values were recorded at the treatment of K2×Mn2 for all the investigated parameters. In brief, the productivity of squash fruits as well as their nutritive content and quality characteristics can be improved through K-soil application and foliar spraying of Mn at levels of 125 kg K2O fed-1 and 0.6 g Mn L-1 , respectively in a dual treatment.

Nanotechnology may be a brilliant solution to many common problems in the agricultural sector in Egypt including the urgent need to reduce mineral fertilization, where many scientific papers have confirmed that Nanofertilizers possess special attributes that don't exist in their conventional counterparts. So a field trial was implemented to evaluate the effect of foliar application of a different sources of NPK fertilizers i.e., mineral form and Nanoparticle form (NPs ) carried on either calcium or chitosan as main plots and soil addition of mineral NPK fertilization at different rates (50+50+25& 75+100+50& 100+200+75, kg fed -1 ) as subplots on the fertility of sandy soil having an EC value of 5.14 dSm -1 and wheat performance. Plant height and chlorophyll content as well as yield, its components and soil available nutrients were evaluated. The findings indicated that wheat plants sprayed with NPs (carried on either calcium or chitosan) possessed performance better than that sprayed with mineral NPK, where the superior treatment was NPK carried on calcium. All studied parameters increased as the added rate of NPK as soil addition increased. On the other hand, the NPK carried on either calcium or chitosan combined with the lowest rate of NPK (50+50+25) gave grain yield values (3.35 and 3.30 Mg fed -1 , respectively ) more than that (2.20 Mg fed -1 ) when plants were sprayed with mineral NPK and simultaneously treated with the highest rate of NPK (100+200+75) thereby it can be concluded that NPs has a vital role in reducing mineral fertilization.

Iron (Fe) deficiency exists as a widespread nutritional disorder in alkaline and calcareous soils; therefore, Fe-enriching strategies may be used to overcome this issue. Field experiments were conducted with a randomized complete design with three replicates for evaluating the effectiveness of iron oxide nanoparticles (Fe-NPs) against traditional Fe compounds (sulfate or chelate), which have various shortcomings on Rose-scented geranium (RSG) herb in terms of plant growth, phytopharmaceuticales, essential oil (EO), and its constituents. Supplementation of Fe-sources considerably improved RSG plant growth and EO yield in the 1st and 2nd cut throughout the two seasons over non-treated control plants. A total of 11 compounds of RSG-EO were identified; the main constituents were citronellol, geraniol, and eugenol. The results indicate that EO composition was significantly affected by Fe-sources. Amendments of Fe-sources considerably augmented photosynthetic pigments, total carbohydrates, nitrogen, phosphorous, potassium, iron, manganese, zinc, phenols, flavonoids, and anthocyanin. Commonly, Fe-NPs with humic acid (Fe-NPs-HA) supplementation was superior to that of traditional sources. The highest values were recorded with spraying Fe-NPs-HA at 10 mg L−1 followed by 5 mg L−1, meanwhile, the lowest values were recorded in untreated control plants. Current findings support the effectiveness of nanoparticle treatment over Fe-sources for improving growth and yield while also being environmentally preferred in alkaline soil. These modifications possibly will be applicable to EO quality and its utilization in definite food and in medical applications.