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.

Field experiments were carried out during the two summer seasons of 2016 and 2017 at The Experimental Farm, Faculty of Environmental Agricultural Sciences, Arish University, North Sinai, Egypt to study the effect of mulch (without mulch and straw mulch) on two colored sweet pepper hybrids ("Yellow Star F1" and "Red Star F1", Capsicum annuum L.). Transplanting was carried out on 19 th May. Straw mulch was added after 10 days later. The experimental plot area was 15m 2 (15 m long and 1.0 m wide). Drip irrigation system was used. Each experimental plot had one dripper line, the distance between plants in the same row was 50 cm, which gave, planting density of 2.0 plants m -2 . Split -plot design with three replicates was used, where sweet pepper hybrids were randomly arranged in the main plots, and mulch treatments were randomly arranged in the sub plots. 'Red Star F1' hybrid recorded the highest values of plant height, number of leaves and leaf area as well as plant fresh and dry weight traits at 75 days after transplanting in both seasons. Red Star F1'and Yellow Star F1' both with mulch recorded the highest values of all vegetative growth traits and marketable yield traits in both seasons. Mulch treatment had higher values of all studied marketable yield traits (number of fruits/plant, mean fruit weight (g), and yield/plant (kg) in both seasons. Using straw mulch increased number of fruits/plant by 48.59% as compared to without mulch treatment. The highest values of all marketable yield traits in both seasons were recorded with 'Red Star F1' or 'Yellow Star F1' both with mulch.