Two green house experiments were carried out at The Experimental Farm of
the Faculty of Environmental Agriculture Sciences, in EI-Arish, Suez Canal University.
during 1999-2000 and 2000-2001· eaHy summer seasons. Sweet pepper (Capsicum
annuum L.) plants cv. Sonar were grown in plastic greenhouse (9 x 60 m.) under drip
irrigation system. The main object of this research was to study the effect of some
irrigation treatments on sweet pepper growth and yield. Also, it induded the effect of
these treatments on soil salt distribution. Five irrigation treabnents were carried out as
follow: Treatment A: one irrigation per day, treatment B: two irrigations with the same quantity
(half in the morning and half at evening) per day , treatment C: one irrigation per 2
days, treatment 0: two irrigations with the same quantity (half in the morning and half
at evening) per 2 days, and treatment E: one irrigation per 3 days. Every treatment was irrigated with the same quantity of irrigation water
(based! on water requirements for one day), which gradually increased from December
to June. A complete block design in three replicates was used. The area of the plot
was 18 m² (10 m long x 1.8 m wide). The distance between plants along the lateral
irrigation line was 50-cm. Transplanting was carried out at December 25^th and harvest
began after (121) days from transplanting and extended for (67) days in both seasons.
Before irrigation treatment. soil salinity Increased in the 0-5 and 5-15 em from the
emitters. It was also noticed that soil salinity for the 15-25 em distance from the
emitter before irrigation was lower than after irrigation during January and February.
then somewhat became higher after than before irrigation during latter months. The
highest values were found for (E) treatment followed by (C). (D). (B) and (A)
treatments, respectively. It is not recommended to use the systems of treatments (C.
o or E) because it is expected that the soil can be salinized in the future.