Greenhouse crisphead lettuce grown with mulching and under different soil water tensions

Geisenhoff, Luciano Oliveira; Pereira, Geraldo Magela; Lima, José Augusto de Freitas; Silva, André Luiz Pereira da; Aviz, William Lee Carrera de

doi:10.1590/1809-4430-eng.agric.v36n1p46-54/2016

Cited by 6 publications

(11 citation statements)

References 15 publications

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“…Bandeira et al (2011) reported that this can be explained by the decrease in leaf water potential, stomatal conductance and CO 2 flow, resulting in an adverse impact on accumulations of photoassimilate compounds and as a consequence, reduction in crop production. Water deficit effect causes changes in stomatal responses, osmotic adjustment and important movement of photoassimilates to the roots, metabolic energy consumption and affects crop production anywhere in the plant as well as its commercial quality (Geisenhoff et al, 2016). According to Soares (2007), plants submitted to increasing salinity were less tender, showing more coriaceous leaves: these characteristics were also observed in this study.…”

Section: Resultssupporting

confidence: 73%

Head lettuce production and nutrition in relation to nutrient solution flow

et al. 2020

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The optimum flow rate of nutrient solution in hydroponic system can better nourish the crops, allowing healthy and faster growth of lettuce. However, flow also interferes with electric power consumption, so further researches are necessary, mainly on the effect of flow rate, nutrient accumulation and lettuce production. In this context, the aim of this study was to evaluate nutrition and production of head lettuce in relation to the nutrient solution flow in NFT hydroponic system. The treatments consisted of nutrient solution application at the flow rates 0.5; 1; 2, and 4 liters per minute in each cultivation channel. Five replicates per treatment consisted of 15 plants each. The flow in hydroponic systems to produce head lettuce alters the technical performance of the crop. Due to the greater nutrient accumulation in shoot and use efficiency of these elements, the highest production (g/plant) of head lettuce was obtained with a flow rate of 1 L/min of the nutrient solution.

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Section: Resultssupporting

confidence: 73%

Head lettuce production and nutrition in relation to nutrient solution flow

et al. 2020

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“…The treatment with 12 kPa favored the use of nitrogen fertilization by jambu plants, which responded with maximum productivity at the highest dose. The treatment with soil-water stress of 12 kPa maintained the soil close to field capacity, demonstrating behavior similar to the results found by Geisenhoff et al (2016) with lettuce and Lima Junior et al (2012) with carrots, who performed irrigation management based on the soil and obtained maximum productivity at stresses close to field capacity. Jambu production is benefited by the stress that maintains soil moisture close to field capacity.…”

Section: Resultssupporting

confidence: 81%

“…Water depths applied before and after treatment differentiation, as well as precipitations during the experimental period, total water supplied to the crop until harvest, number of irrigations, mean irrigation frequency, and daily water demand during treatment differentiation are shown in Table 2. The data in Table 3 showed a linear behavior in relation to water consumption per treatment, similar to that observed by Geisenhoff et al (2016) in an experiment with drip-irrigated lettuce with different stresses, in which the total applied depth decreased as the soil-water stress increased.…”

Section: Resultssupporting

confidence: 81%

“…2020 respectively, submitted to different irrigation depths and observed maximum production values close to the replacement factor of 100% of the evapotranspiration. Geisenhoff et al (2016) also studied lettuce productivity subjected to different soil-water stresses and found a maximum productivity value at a stress of 12 kPa, but with higher water use efficiency with intermediate stresses of 34 and 45 kPa, reaching 579.87 and 471.71 kg ha −1 mm −1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

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Productivity of Irrigated Jambu Under Soil-Water Stresses and Nitrogen Doses

et al. 2020

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Jambu (Acmella oleracea (L.) R.K.) is a short-cycle leafy vegetable from the Amazon region, which needs an adequate availability of water and nutrients, mainly nitrogen, to obtain a rapid mass increase. This research aimed to study the effect of different soilwater stresses and nitrogen doses on jambu cultivation in the state of Pará. The experiments were conducted at the Igarapé-Açu experimental farm of the Federal Rural University of Amazonia (UFRA). The Jamburana variety was used in a 10 × 10 cm spacing, using a randomized block design in a 4 × 4 factorial scheme with three replications. Each plot had a dimension of 0.4 × 0.5 m (0.2 m 2 ), totaling 20 plants in 4 rows, but only the plants of the central rows were useful. Treatments consisted of four soil-water stresses (12, 18, 24, and 30 kPa) as an indication of the irrigation time (critical stress), using drip irrigation, and four nitrogen doses (0, 50, 100, and 150 kg ha −1 ). The use of soil-water stress of 12 kPa associated with nitrogen fertilization at a dose of 150 kg ha −1 is recommended for better development and production of jambu under the conditions this experiment was conducted.

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“…Additionally, an adequate irrigation allows a vigorous growth of the plant, causing less susceptibility to the attack of pathogens. With the object of finding optimal water blade and satisfactory overall production, Geisenhoff et al (2016) evaluated the crisphead lettuce yield subjected to different water tensions in the soil. Regarding the results, they reached maximum productivity in the tension of 12 kPa.…”

Section: Introductionmentioning

confidence: 99%

Productivity of jambu (Acmella oleracea) using different soil water tensions and nitrogen rates under greenhouse condition

et al. 2019

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Acmella oleracea (L.) R.K. is a native Amazon vegetable, known as jambu, which is widely used in regional cuisine and has aroused the interest of the pharmaceutical and cosmetic market. Thereby, this work aimed to study the effect of different soil water tensions and nitrogen rates on Jambu cultivation in the State of Pará. The experiment was conducted in a greenhouse for 30 days in 2016 testing Jamburana cultivar in a 10 × 10 cm spacing in the experiment. The experimental design was based on randomized blocks in a 4 × 4 factorial scheme with three replications. The treatments consisted of four soil water tensions (12, 18, 24 and 30 kPa) adjusted using drip irrigation, and four doses (0, 50, 100 and 150 kg ha-¹) of nitrogen. The analyzed variables were fresh mass, plant height, productivity and water use efficiency. There was no interaction between soil water tensions factors and nitrogen rates for all variables. The results showed that the best water tension in the soil and nitrogen dose that provided better development and productivity of jambu were 18 kPa and 79 kg ha-¹, respectively.

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Greenhouse crisphead lettuce grown with mulching and under different soil water tensions

Cited by 6 publications

References 15 publications

Head lettuce production and nutrition in relation to nutrient solution flow

Head lettuce production and nutrition in relation to nutrient solution flow

Productivity of Irrigated Jambu Under Soil-Water Stresses and Nitrogen Doses

Productivity of jambu (Acmella oleracea) using different soil water tensions and nitrogen rates under greenhouse condition

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