Tomato yield as a function of water depths and irrigation suspension periods/ Produtividade do tomateiro em funcao de laminas e periodos de suspensao da irrigacao

• Published in: Revista brasileira de engenharia agrícola e ambiental 2019-08, Vol.23 (8), p.591
• Main Authors: da Silva, Cicero J, Frizzone, Jose A, da Silva, Cesar A, Golynski, Adelmo, da Silva, Luiz F.M, Megguer, Clarice A
• Format: Article
• Language: English
• ISSN: 1415-4366
• DOI: 10.1590/1807-1929/agriambi.v23n8p591-597

Irrigation management is essential for tomato fruits yield and quality. Therefore, the aim of this study was to evaluate the yield of tomatoes for industrial processing, 'BRS Sena' hybrid, subjected to water depths and irrigation suspension periods before harvest, irrigated by subsurface drip irrigation, in Goias, Brazil (17[degrees]49' 19.5" S and 49[degrees]12' 11.3" W), in 2015 and 2016. The experiments were conducted under a randomized complete block design, with four replications, in split plots. Five irrigation levels (50, 75, 100, 125 and 150% of crop evapotranspiration) were evaluated in the plots and five irrigation suspension periods (0, 7, 14, 21 and 28 days before harvest) were evaluated in the subplots. At 125 days after transplanting the seedlings, the yields of green, mature, rotten fruits and total yield, water productivity and percentages of green, mature and rotten fruits were evaluated. The highest total fruit yields (105.86 and 58.60 t [ha.sup.-1]) were obtained with water replacements ranging from 125.47 (615.09 mm) to 132.11 (564.00 mm) of crop evapotranspiration, in the first and second year of experiment, respectively. Growing plants under water deficit and excess increased the incidence of rotten fruits and decreased that of mature fruits. Pre-harvest irrigation suspension reduced crop yield and incidence of green fruits and increased the incidence of rotten fruits. The highest water productivity by the crop occurred under water deficit, management that may be interesting for regions with water restrictions. Key words: Solanum lycopersicon L., subsurface drip irrigation, industrial tomato, irrigation management, crop evapotranspiration O manejo da irrigacao e essencial para a produtividade e qualidade dos frutos de tomateiro. Objetivou-se neste estudo avaliar a produtividade do tomateiro para processamento industrial "Hibrido BRS Sena" submetido a laminas e periodos de suspensao da irrigacao antes da colheita, irrigado por um sistema de gotejamento subterraneo, na regiao Sul de Goias, Brasil (17[degrees]49' 19,5" S e 49[degrees]12' 11,3" O), nos anos de 2015 e 2016. Os experimentos foram instalados no delineamento em blocos ao acaso, com quatro repeticoes, em parcelas subdivididas. Nas parcelas avaliaram-se cinco niveis de irrigacao (50, 75, 100, 125 e 150% da evapotranspiracao da cultura) e nas subparcelas cinco periodos de suspensao da irrigacao (0, 7, 14, 21 e 28 dias antes da colheita). Aos 125 dias apos o transplantio das muda