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The cultivation of table beet is being largely done in greenhouse. It is among 15 most cultivated crops in Brazil. The quantification of water consumption is relevant to meet water demand at different stages of crop development. Thus, the objective of this study was to evaluate the daily water consumption of table beet cv. Early Wonder in greenhouse under fertigation and different types of fertilization. The experiment was conducted in a greenhouse of Federal University of Campina Grande. Treatments consisted of five doses of nitrogen applied by fertigation (0, 0.7, 1.4, 2.1 and 2.8g per pot) and three types of crop establishment fertilizat ion (earthworm humus; earthworm humus +NPK, and soil without fertilization as control), arranged in a 5 x 3 factor design with four repetitions. A digital hygrometer was used to measure temperature and relative humidity of the air. The reference evapotranspiration was estimated as recommended by Hargreaves and Samani. To meet the water requirement of crop, irrigation must be managed according to its developmental stage. The highest daily water consumption in these growing conditions was obtained in the third stage of development, at which the evapotranspiration of the crop exceeded the reference evapotranspiration. Fertilization with earthworm humus in greenhouse beet cultivation increased the efficiency of water use and can be used instead of chemical fertilization to meet the nutritional needs of the crop. The nitrogen dose of 2.8 g per pot, corresponding to 6.22 g of urea per plant, was the one that provided the highest water content in beet cultivation in greenhouse.

Water consumption of Beta vulgaris L. cultivated in greenhouse under fertigation and types of foundation fertilization