T WO field experiments were conducted, followed by two storage experiments of heads, on the red cabbage, to study the impact of spraying some microelements (iron, zinc, and boron), some plant bio-stimulants (seaweed extract and chitosan) and a combination between them on some chemical constituents, yield, and quality (in a complete randomized block design) as well as the storage ability of heads (in a two-way randomized complete design). Obtained results showed the significant superiority of red cabbage plants sprayed with all studied materials compared to the control treatment in the measured characteristics, i.e., N, P, K, Fe, Zn, B, dry matter, quality attributes, number and weight of outer leaves, head height, head diameter, head weight, and total yield/feddan. Plants treated with seaweed extract + chitosan + element mixture significantly gave the highest values of all studied parameters, except NO 3 -N content. Concerning the effect of the storage experiment, the heads wrapped with light polyethylene significantly gave the superiority in crude protein, total carbohydrates, TSS, total sugars, vitamin C content and anthocyanin. Moreover, these wrapped heads were the least in weight loss in both seasons. In this concern, seaweed extract + chitosan + element mixture along with wrapping harvested heads with light polyethylene gave the maximum storage ability. Thus, it could be recommended that spraying red cabbage with seaweed extract + chitosan + element mixture gave the highest values for characteristics of yield, quality, and storage ability when such treatment was combined with wrapping heads with light polyethylene.

o address the current challenge of rising fertilizer costs and limited expansion of cultivated areas in Egypt, a field experiment was conducted for two successive seasons (2021 and 2022) to evaluate the effect of different tuber soaking techniques before planting and various rates of NPK recommended doses on potato growth and quality attributes. A split plot design with complete randomized blocks, consisting of 15 treatments; the soaking types included no soaking, soaking in normal water, and soaking in magnetized water, while the fertilization rates comprised 100% NPK of the recommended dose, fulvic acid+ 75% NPK from the recommended dose, fulvic acid+ 50% NPK of the recommended dose, biochar+ 75% NPK from the recommended dose, and biochar+ 50% NPK from the recommended dose. The results indicated that soaking tubers in magnetized water before planting yielded the highest values in terms of vegetative growth parameters, chlorophyll contents, ion percentage, potato yield, and quality. Furthermore, plants fertilized with 100% NPK of the recommended dose exhibited the maximum vegetative growth and yield. Likewise, the treatment involving fulvic acid+ 75% NPK showed the maximum values in terms of chlorophyll contents, nutrients percentage, and tuber quality. Based on these findings, it is recommended to soak tubers in magnetized water before planting and fertilize the plants with fulvic acid+ 75% NPK of the recommended dose. This approach can help reduce production costs by 25% while still achieving high potato yield and quality.