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Applying biochar to the soil can mitigate problems that hinder agricultural production, such as water scarcity and low fertility soils. The objective of this research was to evaluate the impact of dry coconut husk biochar and sewage sludge combinations on soil chemical characteristics, growth, yield and water productivity of okra crop. The experiment was arranged in randomized blocks, with 6 treatments (CHB+BSS -coconut husk biochar + biochar of sewage sludge, CHB+RSS-coconut husk biochar + raw sewage sludge, BSS+RSS -biochar of sewage sludge + raw sewage sludge, CHB -coconut husk biochar, BSS -biochar of sewage sludge, WB -without biochar (control)). Plant height, number of fruits per plant, yield and water use productivity were evaluated. To evaluate the effect of biochar on soil, soil samples weretaken to determine pH, CEC, P, K, Ca, Mg concentrations after incorporation of biochar into the soil. The BSS + RSS and BSS treatments provided better results on okra production and growth characteristics with a 421.15% and 419% productivity increase, respectively, compared to the control treatment. The BSS and BSS + RSS treatments provided better water productivity,with values of 14.5 and 13.3kilogramproduced for each cubic meter of water applied, respectively.All soil chemical characteristics analyzed were modified when the biochar was incorporated into the soil. The results provide valuable insight that okra growers can embrace the use of the combination BSS+RSS and BSS, providing better yields and lower water use in growing this plant.

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The objective of this work was to determine the irrigation levels that result in the maximum productivity and efficient use of water for the cultivation of okra. The experiment had five irrigation levels (25, 50, 75, 100 and 125% of crop evapotranspiration-ETc) and a control plot that did not receive irrigation. The experimental design was in randomized blocks, with four replications. Irrigations were applied through a drip system and for irrigation management, the FAO Penman-Monteith standard method was used to estimate the reference evapotranspiration, and crop evapotranspiration was obtained through a constant water table lysimeter installed in the area experimental. The productivity was obtained considering the production of the useful area of each plot with subsequent conversion to kg.ha -1 . The efficiency of water use was determined by dividing the amount produced in kg of fruits per millimeter of water applied in okra culture. The application of different irrigation levels influenced in a significant way the variables analyzed in this experiment. Keywords 75, 100 e 125% da evapotranspiração-ETc) e uma parcela de controle que não recebeu irrigação. O delineamento experimental foi em blocos casualizados, com quatro repetições. As irrigações foram aplicadas através de um sistema de gotejamento, e para o manejo da irrigação, o método padrão da FAO Penman-Monteith foi utilizado na estimativa da evapotranspiração de referência e a evapotranspiração da cultura foi obtida através de um lisímetro de lençol freático constante instalado na área experimental. A produtividade foi obtida considerando a produção da área útil de cada parcela com subsequente conversão em kg. ha -1 . A eficiência de uso da água foi determinada pela divisão da quantidade produzida em kg de frutos por milímetro de água aplicada em cultura de quiabo. A aplicação de diferentes níveis de irrigação influenciou de forma significativa as variáveis analisadas neste experimento.

ABSTRACT:The objective of the present study was to evaluate the production of okra under different levels of irrigation, in the Northeast region of Brazil, Sergipe state. The experiment had five irrigation levels (25, 50, 75, 100 and 125% of crop evapotranspiration-ETc) and a control plot that did not receive irrigation. The experimental design was in randomized blocks, with four replications. Irrigations were applied via a drip system and for irrigation management, the FAO Penman-Monteith standard method was used to estimate the reference evapotranspiration, and crop evapotranspiration was obtained through a constant water table lysimeter installed in the area experimental. The following characteristics were evaluated: average fruit diameter, average fruit length, yield per plant and productivity. The application of different levels of irrigation influenced in a significant way the variables analyzed in this experiment. KEYWORDS: Water economy; horticulture; drip irrigation CULTURA DO QUIABO (Abelmoschus esculentus) SUBMETIDO A DIFERENTES NÍVEIS DE IRRIGAÇÃORESUMO: O objetivo do presente estudo foi avaliar a produção de quiabo em diferentes níveis de irrigação, na região Nordeste do estado de Sergipe. O experimento teve cinco níveis de irrigação (25, 50, 75, 100 e 125% da evapotranspiração-ETc) e uma parcela de controle que não recebeu irrigação. O delineamento experimental foi em blocos casualizados, com quatro repetições. As irrigações foram aplicadas através de um sistema de gotejamento, e para o