The objective of this work was to determine the accumulation of silicon in the plant components of cauliflower (Brassica oleracea var. botrytis) grown with different levels of water replacement and rates of Si. The experimental design was a randomized complete block with three water replacement conditions (40, 70, and 100% evapotranspiration), four Si rates (0, 50, 100, and 150 kg ha-1), and four replicates. Daily evapotranspiration was determined with constant water table lysimeters, with water replacement by a drip system. As a source of Si, silicon oxide was applied three times in the crop cycle - at the initial, intermediate, and final development stages of the plant. At the end of the cycle, samples of plant tissue (root, stem, leaves, and inflorescence) and soil were collected to determine Si by spectrometry. The Si content in the soil was not influenced by water replacement, only by silicate fertilization. The silicon applied to the soil increased the content of the element in the plant components, especially in the roots. Water replacement influences the accumulation of Si in cauliflower plant tissues, with lower amounts of the element under water deficit conditions.
RESUMOA baixa eficiência na utilização da água na irrigação é um fator é importante para minimizar o desperdício e garantir quantidade suficiente para os sistemas agrícolas, devido ao custo da irrigação e de energia estarem cada vez mais elevados. Uma maneira de garantir melhor eficiência na utilização de água pela planta e que vem sendo muito difundida a realização de irrigações com déficit. Com isto, o presente trabalho foi conduzido com o objetivo de avaliar o efeito de lâminas de irrigação com relação sobre a produtividade, massa seca de raízes e a eficiência de utilização da água pela cultura de pepino japonês cultivado em ambiente protegido. Foram testados quatro níveis de reposição das lâminas da evapotranspiração da cultura (75%, 100%, 125% e 150% da ETc) com a evapotranspiração de referência (ET0) estimada pelo modelo de Penman-Monteith. Adotou-se o delineamento inteiramente casualizado com quatro repetições. Foi avaliado a produtividade, a massa seca de raiz e a eficiência de utilização da água, obtendo os seguintes resultados. A maior produtividade (2,19 kg planta -1 ), e massa seca de raízes (12,8 g planta -1 ) foi obtida com o fornecimento de 128% e 114% da ETc respectivamente. A maior eficiência de utilização da água foi obtida com a lâmina de 121% da ETc, notando que um aumento sobre a lâmina de referência (100% ETc) é uma alternativa na gestão de recursos hídricos para aumentar a produtividade da cultura.
Palavras-chave:Cucumis sativus L.; produção; massa de raiz.
EFFICIENCY OF USE OF WATER IN THE CULTIVATION OF JAPANESE CUCUMBER IN GREENHOUSE ABSTRACTThe low efficiency in the use of the water in the irrigation is a factor is important to minimize the waste and to guarantee enough amount for the agricultural systems, due to the cost of the 1 Doutorandos em Agronomia, UEM,
Information related to the phenological growth of oregano grown in a protected environment associated with water and nutritional availability is scarce. In this context, this study aimed to investigate the performance of oregano plants grown with bokashi organic fertilizer under water deficit. The experiment was carried out in randomized blocks in a 6×4 factorial scheme, consisting of six levels of water replacement (60, 70, 80, 90, 100, and 110% of crop evapotranspiration -ETc) and four bokashi doses (0, 100, 200, and 300 g m −2 ), with five replications. The number of branches, leaf area, mass accumulation, and oil concentration and yield were evaluated to characterize the plant performance. The data were analyzed using analysis of variance, multivariate analysis for equation determination, construction of response surface plots and dendrogram charts, and linear correlation. The interaction of the factors water replacement and bokashi organic fertilizer application was significant for the analyzed variables. Morphological components presented better responses under conditions of high water replacement and bokashi organic fertilizer application. The deficit irrigation adopted during cultivation associated with bokashi organic fertilization potentiated the concentration and yield of oregano essential oil.
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