Fertirrigação nitrogenada no cultivo da abobrinha italiana

Abstract

The objective of this work was to evaluate doses and nitrogen sources applied by fertirrigation in the productivity and quality of the Italian zucchini in Red Latosol, dystroferric. The experimental design was a randomized complete block design in subdivided plots with four replicates. The treatments consisted of two nitrogen sources (urea and calcium nitrate) in the plots and five nitrogen doses (0, 60, 120, 240 and 480 kg ha-1) in the subplots. The experiment was conducted from September to December 2015 in the irrigation and drainage area of the Faculty of Agrarian Sciences (FCA) of the Federal University of Grande Dourados (UFGD), in Dourados, MS. At the beginning of flowering at 28 days after sowing (DAS) the SPAD index was determined, and at 46 (DAS) the harvest was started and the productivity parameters were evaluated: leaf number (leaves Plants-1), fresh leaf mass (g), leaf mass (g), plant height (cm), number of fruits per plant, average fruit mass (g), fruit diameter (mm), fruit length ha-1). And quality parameters: pH, total soluble solids content, firmness and acidity. The results showed that the production of zucchini was influenced by nitrogen sources, and calcium nitrate was statistically superior to urea for fresh leaf mass, leaf dry mass, average fruit mass and yield. With respect to the nitrogen doses, it can be concluded that the zucchini significantly responded the doses for the two sources used, except for number of leaves and chlorophyll. However for the quality parameters there was no significant difference in the use of nitrogen sources and doses.