EFICIÊNCIA FLORA E BIOMASSA DOS FRUTOS DE COQUEIRO SOB DIFERENTES LÂMINAS DE IRRIGAÇÃO E NÍVEIS SALINOS

Abstract

The Objective this work was to evaluate the interaction of the amount and salinity of irrigation water in the floral efficiency of the Green Dwarfish coconut tree, in the area of the coastal boards of the Northeast of Brazil. The study was driven in the experimental station of EMPARN, located in Parnamirim - RN, in the period of August of 2002 to September of 2003. The studied factors were four irrigation sheets, based on the evaporation of tank class "A" (30, 60, 90 and 120% of the evaporation of the tank) and four salinity levels in the irrigation water (0,1; 5,0; 10,0 and 15,0 dS.m-1). The experimental design was entirely random with subdivided portions and regression analysis with answer surface. The number of feminine flowers grows with the increment of the irrigation amount, reducing the negative effect of the applied saline levels. The relationship flower / picked fruit reduces with the increase of the saline levels, while the interaction of the largest irrigation sheets with the smallest saline levels results in a growth in the number of flowers emitted by picked fruits. The production in biomass of the fruits grows positively with the increase of the irrigation sheets and it reduces with the increase of the saline levels and the interaction of the smaller saline levels with the largest irrigation sheets produce the largest weights of registered fruits. As reaction the water with high salinity to the plant of the coconut tree answers with the increase of the efficiency of the bloomed related the crop of fruits, in other words, it emits less flowers to obtain the same production that in appropriate conditions of cultivation.