Crescimento inicial e tolerância de cultivares de meloeiro sob estresse salino.

Abstract

In order to study the emergente, initial growth and the tolerante behavior of melon cultivars subjected to irrigation with saline water. The experiment was conducted in a protected environment (greenhouse) at the Centre for Science and Technology Agrifood - CCTA. Federal University of Campina Grande - UFCG, located in the municipality of Pombal, Paraíba, PB. It study was arranged in a factorial 3 x 5 a completely randomized design, consisting of two cultivars of melon (CI - Gaúcho redondo e C2- Gaúcho Casca de carvalho e C3- Halles Best Jumbo) and ave leveis of irrigation water salinity (0.6, 1 .2, 1 .8, 2.4 and 3.0 dS m-l) with four replications and ten plants per repetition. The melon seedlings were grown in trays with a capacity of 30 notes of O.l dm3 substrate during the first 30 days after sowing. During this period the plants were monitored when the emergency, initial growth, dry matter accumulation and the salinity tolerance index. The data were submitted to analysis of variance test 'F'. And in cases of significance was polynomial regression analysis performed for the salinity leveis factor of irrigation water at 5% significance Increased irrigation water salinity reduced growth and dry matter accumulation of melon cultivars. The cultivar Halles Best Jumbo got smaller reductions and higher yields under saline conditions, se it is to grow more tolerant. The cultivar round Gaúcho got the biggest reductions in growth and dry matter accumulation and to cultivate more sensitive to salinity.