This study was installed to evaluate the effect of pulse drip irrigation under different water depth levels (fertigation) in the main water relations of coriander crop (Coriandrum sativum). The experiment was installed under protected environment conditions, at UFRPE, Recife, Brazil. The experimental design was randomized blocks in a 2x5 factorial scheme, with three replications. Treatments consisted of two application types (continuous and pulsed irrigation), and five water depths with replacement of 40, 60, 80, 100 and 120% of crop evapotranspiration (ETc). Water demand was estimated through water balance using a drainage lysimetry. Six irrigation pulses were defined with a 60-minute-rest interval between two successive applications. Plants irrigated by pulses showed higher water productivity values (fresh and dry mass), higher water content (shoot and root), higher shoot mass production index and lower root mass production index and root-shoot ratio. The reduction of applied fertigation water depths increased plant water stress index. The irrigation pulses used ensured water content able to maintain the crop’s marketable quality. Pulse application in irrigation system increased shoot mass production index and reduced root mass production index.
This study aimed to evaluate the dry matter production and nutrient accumulation of coriander (Coriandrum sativum L.) under pulse and continuous fertigation depths. The experiment was conducted in randomized blocks in 2 x 5 factorial arrangement, with three replicates. Treatments consisted of two types of fertigation application (pulse and continuous) and five fertigation depths (40, 60, 80, 100 and 120% of crop evapotranspiration – ETc). Highest accumulations of dry matter, N, P, K, Fe, Mn, Cu and Zn were obtained with pulse fertigation. Pulse fertigation combined with depths lower than 100% ETc led to highest accumulations of K, Mn, Cu and Zn. The accumulation of nutrients decreased in the following order: K > N > Ca > P > Mg > S > Fe > Mn > Zn > Cu.
RESUMO:A alface (Lactuta sativa L.) é uma das hortaliças mais consumida em todo o mundo, tendo seu cultivo um alto consumo de água, uma vez que a Região Nordeste apresenta déficit hídrico e distribuição de precipitações irregulares durante o ano, se tornando necessário o uso racional da água para irrigação. Objetivo-se avaliar a produtividade da cultura da alface em função de diversas lâminas de água e diferentes tipos de adubos. O experimento foi conduzido na área experimental do Grupo Irriga do Campus de Arapiraca da UFAL. O delineamento experimental foi conduzido em blocos casualizados contendo parcelas e subparcelas, em arranjo fatorial 3x3x4, com três blocos, três níveis de laminas de água (50; 100 e 150% da ETc) e quatro tipos de adubação (testemunha (sem adubação); esterco bovino; esterco de aves; fertilizante químico). Foi utilizado o sistema de irrigação por gotejamento. As variáveis analisadas foram: número de folhas (NF), área média das folhas (AMF), massa fresca da parte aérea (MFPA), massa fresca da raiz (MFR), massa seca da parte aérea (MSPA) e massa seca da raiz (MSR). Neste sentido, pode-se concluir que a cultura da alface respondeu significativamente a todas as lâminas aplicadas, sendo a lâmina correspondente a 150% da ETc a que apresentou os melhores resultados para todas as variáveis analisadas. Não houve efeito significativo para os tipos de adubo e nem para lâminas associadas aos tipos de adubos para as variáveis analisadas. PALAVRAS-CHAVE:Evapotranspiração, manejo de água, irrigação. PRODUCTION OF THE CULTURE OF THE LETTUCE (Lactuta sativa L) IN FUNCTION OF THE IRRIGATION SLIDES AND TYPES OF FERTILIZERS ABSTRACT:The lettuce (Lactuta sativa L.) is one of the most commonly consumed vegetables worldwide, having its cultivation a high water consumption, since the Northeast region presents water deficit and irregular precipitations distribution during the year, if making necessary the rational use of water for irrigation. Objective was to evaluate productivity the lettuce crop in function to diverse water slides and different types of fertilizers. The experiment was conducted in the experimental area of the Irriga Group of the Arapiraca Campus of the Federal University of Alagoas. The experimental design was conducted a randomized block containing plots and sub plots, in the 3x3x4 factorial arrangement, with three blocks, three levels of water slides (50, 100 and 150% of ETc) and four types of fertilization (control (without fertilization), cattle manure, chicken manure, chemical fertilizer). Was used the drip irrigation system. The variables analyzed were: number of leaves (LN), average area of the leaves (AAL), fresh weight of the aerial part (FWAP), fresh weight of the root (FWR), dry weight of the aerial part (DWAP) and dry weight of root (DWR). In this sense, it can be concluded that the culture of lettuce significantly responded to all water slides applied, the corresponding blade to 150% of ETc presented the best results for all variables analyzed. There was no significant effect for the ...
The use of brackish water to cultivate lettuce can cause nutritional imbalances, impairing production. In this context, the objective of the present study was to evaluate the effect of salinity on the accumulation of dry matter of the aerial part and macronutrients K, Ca and Mg and their relations with Na in lettuce cultivars grown in a low-cost hydroponic system. The experiment was conducted in a randomized block design, in a 6 × 2 factorial scheme, with four replicates. The treatments consisted of six electrical conductivities of the nutrient solution (1.5, 2.5, 3.5, 4.5, 5.5 and 6.5 dS m-1) and two lettuce cultivars, Betty [iceberg] and Mimosa [green-leaf]. Regardless of the evaluated cultivar, the increase in the electrical conductivity of the nutrient solution reduced the accumulation of dry matter in the aerial part. In both cultivars, the increase in the electrical conductivity of the nutrient solution reduced the accumulations of K and Mg and increased Na/K, Na/Ca and Na/Mg ratios. The green-leaf cv. Mimosa showed Ca and Mg accumulations higher than that in the iceberg cv. Betty, regardless of electrical conductivity. The increase in electrical conductivity reduced the accumulation of K, in both cultivars evaluated. The decreasing order in the accumulation of macronutrients and sodium in both cultivars was: K > Na > Ca > Mg.
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