Evolução da salinidade em solo luvissolo cultivado do melão irrigado por gotejamento.

Abstract

A study was conducted at "São João" farm to evaluate the evolution of the luvissolo soil salinity under a melon crop irrigated by tricklc with diffcrcnt water salinity leveis and irrigation management, in the municipal district of Mossoró-RN, during the period of September to November, 2000. The treatments were composed of the combination of three factors: salinity of the irrigation water with 3 leveis (SI = 1.1 dS.m"1; S2 = 2.5 dS.m"1 and S3 = 4.5 dS.m"1), two cullivars of melon (O = Honey Dew Orange ílesh and T = Trusty) and two frequencies of application of irrigation water with 2 leveis (Fl = intervals of one day upto 30 days, after sowing and there afler or twice a day and F2 - interval of two days or upto 30 days after sowing and there afler). The experimental design was a 3x2x2 in factorial scheme completely randomized block with 4 repetitions. The results showed lhat the soil salinity developed with the time, being lhe close largest leveis the surface of the soil and to the gotejador; the soil salinity tended to attain equilibrium starting from the end of the melon cycle and that lhe evolution of the soil salinity was proporlional to salt conccntralion of the irrigation water, indcpcndent of lhe irrigation frequency.