Dry matter production and macronutrient leaf composition in lettuce under fertigation with nitrogen, potassium and silicon

Souza, Renan Soares de; Rezende, Roberto; Freitas, Paulo Sérgio Lourenço de; Gonçalves, Antônio Carlos Andrade; Rezende, Graziela Silva

doi:10.1590/1807-1929/agriambi.v19n12p1166-1171

Cited by 6 publications

(9 citation statements)

References 14 publications

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“…The current results meet the ones reported by Souza et al (2015), who evaluated the response (i.e., commercial shoot dry matter production and macronutrient accumulation) of lettuce cv. Vera subjected to the application of different nitrogen and leaf potassium silicate-based fertilizer concentrations (1.15, 6.90, 11.50, 16.10 and 21.85 kg ha -1 ).…”

Section: Resultssupporting

confidence: 91%

Growth, Yield and Post-Harvest Evaluation of Lettuce Plants Subjected to Different Leaf Silicon Concentrations

Neves

Júnior

Neto

et al. 2020

Rev. Agric. Neotrop.

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Lettuce is considered the most produced and consumed leafy vegetable; however, it has short post-harvest life, which generates significant losses for both producers and consumers. Studies have proven the beneficial effect of silicon on fruits and vegetables. Therefore, the aim of the current study is to evaluate the influence of leaf calcium silicate application on the growth, biomass production and postharvest conservation of curly lettuce. The experiment was carried out in greenhouse at Federal Rural University of Amazonia, Parauapebas Campus / PA. It followed a completely randomized design (CRD) with five Si concentrations (0.0, 2.0, 4.0, 6.0 and 8.0 mg L-1) and eight repetitions, which totaled 40 plants. Plants were grown in plastic pots (capacity = 3 dm3) filled with soil classified as Red-Yellow Argisol. Different Si concentrations were applied to plant leaves, at the 20th and 27th days after transplantation (DAT). Silicon has favored the growth and development of lettuce plants, as well as reduced their post-harvest weight loss. It was possible concluding that the herein tested Si concentrations, which were applied to leaves - in the form of calcium silicate - had beneficial effect on lettuce plants.

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Section: Resultssupporting

confidence: 91%

Growth, Yield and Post-Harvest Evaluation of Lettuce Plants Subjected to Different Leaf Silicon Concentrations

Neves

Júnior

Neto

et al. 2020

Rev. Agric. Neotrop.

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“…Table presents the mean values and standard errors of the production variables for each treatment. Similar values for the production variables in irrigated lettuce were obtained by Escarabajal‐Henarejos, Molina‐Martínez, Fernández‐Pacheco, and García‐Mateos (2015c); Pérez‐López, Miranda‐Apodaca, Muñoz‐Rueda, and Mena‐Petite (); Sawadogo et al (); Souza, Rezende, deFreitas, Gonçalves, and Rezende (); Stagnari, Galieni, and Pisante (). For all measurements, treatment

W_{4}

presented the smallest values.…”

Section: Resultssupporting

confidence: 77%

Analysis of lettuce evapotranspiration across soil water

Pereira

Suguiura

Pereira

et al. 2018

Natural Resource Modeling

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In this study, we evaluated the lettuce accumulated evapotranspiration (ET) across four levels of irrigation, using a nonlinear mixed‐effects model. The plants were grown in protected environments and monitored over 23 consecutive days. When the moisture of the substrate in the vessels reached 50% of their maximum retention capacity, the water levels were elevated according to four treatments: W 1 = 62.5 %, W 2 = 75.0 %, W 3 = 87.5 %, and W 4 = 100.0 %. The model appeared to provide a good fit to the data and showed that the estimates of the maximum amount of accumulated ET were similar for the three treatments with soil water deficit and lower for W 4. The results of the study supported the idea that optimization of the ET of lettuce plants could be achieved through irrigation with deficit, also indicating that the economical use of water was the most efficient way to boost agricultural production. Recommendations for resource managers The continued growth of the world population will result in a decrease of quality and availability of water and also an increase in demand for food. Therefore, sustainability will depend on high agricultural productivity with rational use of water. Considered the most efficient technology for boosting agricultural productivity, irrigation is also the largest water consumer in the world. With any kind of irrigation in the vegetable production area, the water intake for the plants must be treated with great caution. Both a lack or excess in water can decrease plant productivity. The amount of water available in the soil should be enough to maximize production. It is shown that high levels of irrigation are not necessary for this. It is important to balance the amount of irrigated water for an optimal level, in order that the production has its the production is maximized and valuable water resources are not wasted.

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“…Therefore, nutrient supply via fertigation immediately after seedling emergence may have provided better conditions for growth, thereby increasing NL and SDW (Figures 1A and 1B). Similarly, Souza et al (2015) studied lettuce production under fertigation with N doses and foliar K application and found that the larger the dose of these nutrients (171 kg ha -1 of N, and foliar fertilizer with 21.85 kg ha -1 of K2O), the higher the shoot dry weight in these plants. These findings are important because dry matter production has been identified as one of the best parameters for assessing seedling quality (Beninni et al 2005;Souza et al 2015;Ferreira et al 2019).…”

Section: Discussionmentioning

confidence: 99%

What is the optimal fertigation start time and frequency in lettuce seedlings?

Neto

Moreira²,

Júnior³

et al. 2023

Biosci. J.

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Although lettuce is one of the most important vegetable crops cultivated in Brazil, producers conduct seedling production empirically, as there are no published reports on the optimal start time and management strategy for seedling fertigation. The present aimed to assess the influence of fertigation management on the growth, physiological aspects and nutritional status of lettuce seedlings and to determine the optimal fertigation start time and frequency. Two experiments were conducted, each with a randomized block design and six repetitions. The first consisted of six treatments, namely six fertigation start times at 0, 3, 6, 9, 12, and 15 d after emergence (DAE), and the second consisted of five treatments, representing different application frequencies at 3, 4, 5, 6, and 7 d intervals. The assessment of nutrient accumulation levels and biometric and physiological characteristics of the seedlings were performed after transplanting. Fertigation start times significantly affected 14 of the 18 variables assessed, particularly the number of leaves, shoot dry weight, leaf area, initial chlorophyll fluorescence, and P, K, Ca, Mg, and S accumulation. The best results for ten variables were obtained when fertigation began at emergence, with values 17.77 - 35.63% higher than those at fertigation onset at 15 DAE. Application frequency only influenced chlorophyll content and N, P, K, and S accumulation, with optimal results obtained at 3 - 6 d intervals. Beginning fertigation at plant emergence favors dry weight production, nutrition and photosynthesis and shortens the production time of lettuce seedlings. The optimal start time for lettuce seedling fertigation is at emergence, with application performed every 6 d.

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Dry matter production and macronutrient leaf composition in lettuce under fertigation with nitrogen, potassium and silicon

Cited by 6 publications

References 14 publications

Growth, Yield and Post-Harvest Evaluation of Lettuce Plants Subjected to Different Leaf Silicon Concentrations

Growth, Yield and Post-Harvest Evaluation of Lettuce Plants Subjected to Different Leaf Silicon Concentrations

Analysis of lettuce evapotranspiration across soil water

What is the optimal fertigation start time and frequency in lettuce seedlings?

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