Field experiments were carried out in summer season of 2017 and 2018 at the Experimental Farm, Faculty of Environmental Agricultural Sciences, Arish University, North Sinai, Egypt. This study aimed to study the effect of some soil organic additives (without application, application of biochar of citrus pruned branches alone at a rate of 4 ton fed-1 , application of crashed wheat straw mulch at a rate of 1.25 ton fed-1 , and application of biochar + crashed wheat straw mulch both at a ratio of 1:1(in weight basis) from their previous doses per fed. on growth and yield of tomato crop. Seeds of "GS 12 F 1 " hybrid were used and seedlings were transplanted on 23 rd April. Plants were irrigated using drip irrigation system; the plot area was 14.4 m 2 (12 m length and 1.2 m width), the distance between the plants in the same row was 50 cm; planting density was 1.67 plant/m 2. Treatments were randomly distributed in a randomized complete block design in three replications. Results cleared that soil organic additives resulted in gradually reduction in soil pH and EC during all periods of plant growth, with recording the lowest values in the late period. Also, the application of biochar + crashed wheat straw mulch followed by biochar alone recorded the lowest values in both seasons. The highest values of soil cation exchange capacity (CEC), soil cations and anions, and the lowest soil osmotic pressure were recorded with application of biochar + crashed wheat straw mulch followed by biochar alone in both seasons. Also, results indicated that the highest values of all studied vegetative growth traits, fresh and dry weight traits, and content photosynthetic pigments; viz, chlorophyll a, chlorophyll b, and carotenoids were recorded with application of biochar + crashed wheat straw mulch followed by application of biochar alone. The highest value for each of grade a, grade b, and total marketable tomato fruit yield per fed. were recorded with the application of Biochar + crashed wheat straw mulch followed by application of biochar alone in both seasons. On the other hand, the highest unmarketable yield was recorded with the control treatment (without organic additives) in both seasons, while the lowest values were recorded with application of biochar + crashed wheat straw mulch followed by application of biochar alone. Also, significant effects for organic additives were recorded for most studied fruit quality traits in both seasons.

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Sixteen new lines of tomato (F5) were selected from six F2 generations, which exhibited high homogeneity based on estimated CV % values for plant height, number of leaves/ plant, hardness, shape index, TSS% and Vitam. C content during successive four seasons from 2017/2018 to 2020/2021 in the Experimental Farm, Faculty of Environmental and Agriculture Sciences, Arish University, North Sinai under open field conditions. The experimental work was conducted using a randomized complete block design with three replications. A highly significant differences were observed among the selected lines for all studied characters. Lines that showed the most vigorous growth were DAN-2-2, DAN-3-4, DAN-3-5, 6130-1-1, 6130-3-2, 6130-3-4, 3017-2-1, 3017-2-6, 783N-1-4, TYG-1-3, TYG-2-1, TYG-2-1, TYG-4-1 and KIS-N-2-1. For Mean performance all plants in the lines 6130.1.1, 6130.3.4, 3017.2.1, 3017.2.6, TYG-1-3 and KIS-N-2-1 were resistance to Tomato yellow leaf curl virus. Two lines recorded highest values for total yield, 3017.2.1 and 3017.2.6, while 6130.3.2 and 6130.3.4 where the best for avrage fruit weight.

2, were crossed in 7×7 half diallel mating design. The study was conducted in the experimental farm of, Faculty of Environmental and Agriculture Science, Arish University, North Sinai, Egypt to produce superior hybrids tolerant to Tomato Yellow Leaf Curl Virus (TYLCV). For heterotic effect, heterosis over mid-parents, better parent and check hybrid were detected in many traits, q.e.; plant height, No. of leaves, Fruit set (%) in first three clusters, hardness, T.S.S., total yield/plant and average fruit weight. For plant height heterosis, 12 crosses exhibited significant positive values ranging from 5.83% in the cross (4x7) to 23.8% in the cross (1x5) over the check hybrid. For number of leaves/plant 15 ones reflected mid-parents heterosis with significant values ranging from 8.23% for 1x6 to 59.4% for 2x6, suggesting dominance toward the high number/plant. Hybrids with good hardness were (1x7,2x4,2x7,3x4, and 4x7), total yield (1x5, 2x6, 2x7,4x5,4x7,5x6,5x7, and 6x7), and they were also found to have tolerance to heat stress and TYLCV under North Sinai conditions.

This study was carried out on cantaloupe plants (cv 'Gal152' ( during the winter seasons of 2019-2020 and 2020-2021 to study the effect of three soil applications of K 2 SO 4 rates (100%, 75%, and 50%of recommended potassium requirements) and spraying four foliar potassium sources (potassium silicate, potassium citrate, potassium acetate, potassium thiosulphate, and tap water spray as control treatment). Transplanting was done on 25 th December under low plastic tunnels in sandy soil The soil 100% K + foliar potassium silicate recorded the highest cantaloupe vegetative growth traits. The highest plant fresh weight was recorded by the interaction treatment of soil application at 50% of recommended K + foliar k-acetate in the first season, while the highest values in the second season were recorded with soil 100% K +foliar K citrate without significant differences than 50% of recommended K + foliar k-Acetate. The highest plant dry weight was recorded by applying soil 75% recommended K + foliar application of K-silicate and 100 of soil K + foliar K silicate in the first season and soil 50% of recommended K + foliar K acetate without significant differences than soil application of 75% recommended K + foliar K silicate in the second season. The highest leaf pigments were recorded by the interaction of soil 100% of recommended potassium + foliar citrate potassium application in all studied traits, except chlorophyll a at 75 days after transplanting and carotenoids content at 50 and 75 days after transplanting.