CRESCIMENTO DO PINHÃO - MANSO SOB DIFERENTES NÍVEIS DE SALINIDADE E SILÍCIO

Abstract

The use of Silicon on the plants cultivation is one the most used strategy in order to reduce the negative effects of soils salinity. The goal of this work is to evaluate the influence of Silicon on minimizing the negative impacts due to salinity of irrigation water in the Jatropha curcas plants growth. The experiment was carried out at the National Center of Cotton Research, in a completely randomized design and treatments ar- ranged in a factorial 4 x 4 x 6, performed by four levels of salinity of irrigation water (0,43; 2,5; 5,0; and 7,5 dS m - 1 ), four levels of Silicon (0; 221,76; 443,52; and 665,28 mg L - 1 ) and six evaluation periods (40, 55, 70, 85, 100 and 115 days from emergence) with three replications. The analysis of variance, the F test and the polyno- mial regression to 0.05% significance were used to evaluate the data. hight plant, diameter stem plant, number of plant leaves, leaves plant area, total dry matter, dry matter roots plants e dry mass stem plants, dry mass of shoots and roots of Jatropha curcas were not affected by salinity of water at 115 days after sowing. The leaves number and leaf area were influenced by Silicon.