Effect of Irrigation Intervals on Growth and Productivity and Some Water Relations of Some Tomato Hybrids Grown Under Saline Soil Conditions

Two field experiments were carried out during the two successive summer seasons of 2017 and 2018 in a private sector farm at Kafr El-Sheikh Governorate, to investigate the effect of four irrigation intervals (every 10days, 15ays, 20ays and 25days)  on vegetative growth , chemical composition , fruit yield and quality  of some tomato hybrids (Alissa F1, Carmen F1and Super strain B) and also their interactions under saline soil conditions.The study included 12 treatments which were resulted from the combinations between four irrigation treatments (Irrigation every 10 days, 15 days, 20 days and 25 days and three tomato hybrids (Alissa F1, Carmen F1and Super strain B). Results clearly  showed that using irrigation  every 10(2850 m³/fed)  and 15 days (2550 m³/fed)  with Super strain B  reflected the highest  values vegetative growth aspects of tomato plants and increased plant height, number of branches and leaves /plant and fresh and dry weight of plant as well as leaves area ,chlorophyll content, N, P, K,  and proline, In addition, both fruit yield per plant and feddan as well as marketable fruit yield were increased, while unmarketable yield was decreased as a result of interaction treatments. The quality trait of tomato fruits i.e.., average fruit weight,length,diameter, fruit firmness,T.S.S., vitamin C and total acidity were increased.