A two year experiment was carried out in newly reclaimed soils (sandy soils) to investigate the effect of cutting and phosphorus and potassium fertilization on the growth, yield, seed mucilage content and seed protein content of guar plant. The results revealed that different cutting treatments significantly decreased the plant weight, seed yield, seed mucilage content and seed protein content. Phosphorus fertilization up to 350 kg super-phosphate (15% P2O5)/feddan* significantly increased plant weight, seed yield, seed mucilage content and seed protein content. Fertilization with 150 kg potassium sulfate (48% K2O)/feddan was quite capable to meet guar plant potassium demands in this kind of soil. Without cutting plants, fertilization with 350 kg super-phosphate and 150 kg potassium sulfate/feddan resulted in the highest seed yield, seed muculage content and seed protein content.

A field experiment with three replications was conducted on sprinkler irrigated sandy soil during two successive summer and winter seasons (summer 2021 and winter 2021/2022), which cultivated with corn (Zea mays) and faba bean (Vicia faba L.) at Agricultural Research Station farm in Ismailia Governorate, Egypt. Faba bean (Vicia faba L.) was cultivated as an indicator crop to evaluate the residual effect of different rates of zinc nutrient in nanoparticles form versus mineral zinc sulphate fertilizer and studying their effects on growth and crop yield and some soil chemical properties. The zinc nutrient forms were applied by fertigation through sprinkler irrigation system. The obtained results revealed that the corn and bean parts dry matter, yield and some soil chemical properties including available soil nutrients content, EC, pH and SOM were greatly improved in general with additions of these nutrients forms. During zinc nanoparticles treatments, the most effective treatment was with the rate of half dose from minerals at recommended dose (ZnNPs at 50% MNRD). Mineral forms in normal recommended dose (MNRD) gave nearly equal effect with ZnNPs at 50 % MNRD.

Nanotechnology and organic fertilization are represented the most important tools for agriculture and anticipated to become a driving economic force in the near future. Two field experiments were carried out on sandy soil at El Ismailia Research Station, Agriculture Research Center Egypt, to study the effects of application of nitrogen fertilizer, as black urea, Nano black urea and organic fertilizer FMY, nutrients and productivity of Cucurbita pepo L. Two rates of FMY at 50 and 100 m3 ha-1 was applied to the soil with soil application of black urea and Nano black urea) with applied both as foliar application on plants. A split-plot design with four replications for each treatment was used, during the two summer seasons of 2019 and 2020. Results obtained showed that yield components of plants increased with applied Nano black urea and black urea accompanied with application both rates of FMY. The Nano black urea accompanied with FMY applied at a rate of 100 m3 ha-1 give the highest yield values. However, effective treatment was foliar Nano black urea application with a rate of 0.5 ppm with organic fertilizer FMY at rate of 100 m3 ha-1 and gave the highest significant values of fruits yield (300, 327, 342, 356 and 373 g plant-1 for five times picked, respectively. On the other hands, in foliar application, fruits weight yield was higher than the first cut. Nutrients contents showed almost a trend as all parameters under study the superior treatment was at Nano black urea foliar application a rate of 0.5 ppm with 100 m3 ha-1 of FMY with high availability of nutrients at the studied soil.

A field experiment was carried out at Khaled Ibn El-waleed village, Sahl El-Hussinia, El-Sharkia Governorate, Egypt, during two summer seasons 2019 and 2020 to study the effect of NPK nanofertilizers, biofertilizers and humic acid combined with or without mineral fertilizers different at rates on some soil physical properties and soybean productivity and quality under saline soil conditions. The treatments consisted of: NPK-chitosan, NPK-Ca, humic acid, biofertilzer and control (mineral NPK only). In both seasons, the experiment was carried out in a split plot design with three replicates. The results indicated a significant increase in the soybean yield parameters as compared to control. There was also a significant increase in dry and water stable aggregates in all treatments as compared to control. The treatment NPK-Chitosan was the best in improving dry and stable aggregates. Also, hydraulic conductivity and total porosity values were significantly increased in all treatments due to increase in soil aggregation and porosity that led to increase in values of hydraulic conductivity. Values of bulk density were decreased, the lowest values of bulk density were found in NPK-chitosan treatment as a result of the high concentration of organic matter resulted from NPK-chitosan is much lighter in weight than the mineral fraction in soils. Accordingly, the increase in the organic fraction decreases the total weight and bulk density of the soil. Concerning soil moisture constants, all treatments significantly increased field capacity and available water compared to control. This increase was due to improvement of the soil aggregates and pores spaces which allowed the free movement of water within the soil thereby, increasing the moisture content at field capacity.