The Effect of Water Salinity Variation on Some of the Agronomic Traits of Late Summer Melon

To study the effect of different water salinity and water management on some of the agronomic traits of late summer melon with drip irrigation, an experiment with 7 treatments and 3 repeats was conducted in a randomized complete block design, in Torogh station, Mashhad. The irrigation treatments were: 1- fresh water from planting to harvest 2- water (3 ds/m) from planting to harvesting 3- water (6 ds/m) from planting to harvest 4- water (6 ds/m) from 20 days after plantation to harvest 5-water (6 ds/m) from 40 days after plantation to harvest 6-water (3 ds/m) from 20 days after plantation to harvest 7-water (6 ds/m) from 40 days after plantation to harvest. Result showed that, increased irrigation salinity had no significant effect of the number of seeds germination, but it caused that seeds germinated a little late. Irrigation treatments had a significant effect on the emergence of male flowers. With increasing salinity, reduced the number of male and female flowers but was not significantly different. The effect of water quality on dry weight of leaf, stem and stub was significant. The leaf area in two treatments that were irrigated with fresh and brackish water from planting to end, were more than other irrigation treatments at the end of growth. Increasing salinity lead to increase the chlorophyll density. The yield average of fresh water was 17.5% and 26% higher than brackish and salinity water respectively, that difference between the yield of fresh water and two other waters were significant (about 5%). But had not significantly different between the yield of brackish and salinity water.