RESUMO:Em Sergipe, a alface (Lactuca sativa L.) é uma das hortaliças mais produzidas em sistemas irrigados, portanto é importante estudar meios que propiciem o melhor rendimento para a cultura. O objetivo deste trabalho foi avaliar a influência de diferentes tipos de cobertura do solo e a necessidade de adubação orgânica (esterco bovino) na produção de alface -cultivar Babá de Verão. O estudo foi desenvolvido na Fazenda Experimental -Campus Rural da Universidade Federal de Sergipe, localizada no município de São Cristóvão (SE). O delineamento utilizado foi de blocos casualizados com três repetições, em esquema fatorial de 4 x 2, com quatro tipos de cobertura (plástico preto, plástico preto e branco, plástico preto e prata e ausência de cobertura), e duas condições de adubação orgânica (ausência e presença). As características avaliadas da planta foram: diâmetro, matéria fresca e seca da parte aérea e número total de folhas. Houve efeito significativo para o fator adubação, em que as plantas que receberam adubação orgânica obtiveram resultados superiores em relação às plantas não adubadas. A cobertura que proporcionou melhores resultados foi a com plástico preto e branco, chegando a valores de diâmetro, massa seca e fresca da parte aérea e número de folhas totais iguais a 32,6 cm, 17,11 g, 307,9 g e 54 folhas, respectivamente. A cobertura com o plástico preto e branco melhora o desempenho do cultivo da alface cv. Babá de Verão. O uso de adubo orgânico é fundamental para a melhoria do desenvolvimento da alface. ABSTRACT: In Sergipe, lettuce (Lactuca sativa L.) is one of the most produced vegetables in irrigated systems; therefore, it is important to study means that provide the best crop yield. This work aimed to evaluate the influence of different soil cover types and the need

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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.

A alface é uma das hortaliças mais exigentes em água, sendo seu déficit um fator limitante para a produção desta olerícola. O objetivo do trabalho foi avaliar a influência de diferentes tipos de cobertura do solo na umidade do solo. Para tanto foi escolhida a cultivar Babá de Verão. O trabalho foi desenvolvido em área experimental localizada no Campus Rural, que fica a 15 km da Universidade Federal de Sergipe. O delineamento utilizado foi de blocos casualizados com três repetições, sendo os tratamentos compostos de três tipos de cobertura (plásticos: preto, preto e branco, preto e prata) e testemunha sem cobertura, todos com e sem adubação, totalizando 8 tratamentos. Foram instalados tensiômetros para a realização da avaliação da tensão de água no solo. Os resultados mostraram que a umidade manteve-se dentro do limite adequado para a cultura da alface quando utilizou-se cobertura no solo.Palavras-chaves: hortaliça, manejo de água e solo, mulching SOIL MOISTURE EVALUATION IN FUNCTION OF ORGANIC MATTER PRESENCE AND GROUND COVER IN LETTUCE GROWTH (Lactuca sativa L) ABSTRACTThe lettuce crop is one of the most vegetables that requires water, and its deficit is a limiting factor to produce this vegetable. This work aimed to evaluate the influence of different types ofcover soil in the soil moisture. Thus,it chose a summer cultivate. The study was carried out in experimental field of the Rural Campus, which is 15 km from the Federal University of Sergipe. The design was a randomized complete block design with three replications, and the treatments composed of three types of coverage (Plastic: black, black and white, black and silver) and control without coverage, all with and without fertilizer, totaling eight treatments. Tensiometers were installed to carry out the assessment of water stress in thesoil. The results showed that moisture was maintained within the appropriate limits for the culture of lettuce was used as ground cover.

The correct irrigation frequency relies on the plant population density to increase yield and efficiency in water use. A field experiment was carried out in 2019 to study the effect of three irrigation frequencies, one (F1), four (F2), and eight (F3) days, and four planting densities, 20 (D1), 24 (D2), 28 (D3), and 30 (D4) plants per m2, on the variables: soil moisture, actual water consumption, growth, grain yield, and water productivity of beans (Phaseolus vulgaris L.). The soil water balance was calculated based on the soil moisture, which was measured by tensiometers. The irrigation was done by a drip tape. The variation in soil moisture was greatly influenced by irrigation frequencies and planting densities in F3. Plant growth was not affected by treatments. Irrigation frequencies and planting densities have deeply affected the biometric and chlorophyll synthesis traits of beans. The highest yields were found in the treatments F1D3 (2968 kg ha−1), F1D4 (2997 kg ha−1), and F3D3 (2946 kg ha−1). For water productivity, treatments with F1 irrigation frequency and the higher planting densities were more efficient in water use. Overall, the results are useful for technicians and farmers who work with irrigation management on beans.