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.

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 to study the effect of four irrigation levels (100%, 80%, 60% and 40% of irrigation requirements) on growth and yield of tomato. Seeds of "GS 12 F 1 " hybrid were sown in plastic speeding trays on 14 th March and transplanting was carried out on 23 rd April. Plants were irrigated using drip irrigation system, the distance between dripper lines centers was 1.2 m. 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 . The highest values of all studied vegetative growth traits, fresh and dry weights, and contents of chlorophyll a, chlorophyll b, and carotenoids were recorded with application of 80% followed by 100% irrigation levels. The highest value for each of grade a, grade b, and total marketable fruit yield per fad., were recorded with the 80% irrigation level in both seasons. The highest unmarketable yield was recorded with the use of the irrigation level of 60%, while the lowest values were recorded with application of 100% or 80% irrigation level.