Análise de crescimento e produtividade do pak choi cultivado sob diferentes doses de nitrogênio

Dartora, Janaína; Guimarães, Vandeir Francisco; Echer, Márcia de Moraes; Pauletti, Daiana Raquel; Marini, Deniele

doi:10.1590/s0034-737x2013000400008

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…The net assimilation rate (NAR) is the balance between the material produced by photosynthesis and the material lost by respiration (Dartora et al, 2013), indicating leaf efficiency in biomass production. Similar to other indexes, values are reduced during the cycle (Figure 3) due to selfshadowing and increased respiration for plant maintenance.…”

Section: Resultsmentioning

confidence: 99%

Growth Analysis of Potted Gerbera Conducted With Mineral Fertilization and Organic Fertigation

et al. 2016

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(1):111-120. Potted gerbera is an ornamental plant that is widely commercialized in Brazilian markets. However, information on cultivation techniques is needed to meet growing demand, especially with regard to fertilization. This study was carried out to assess the growth of potted gerbera, Florist Red Black cultivar, with mineral and organic fertilization. The experiment was conducted in a greenhouse located at UNIOESTE -Cascavel Campus -PR. The experimental design was composed of randomized blocks with four replicates and five treatments. Treatments were defined according to the fertilization source, which were mineral (NPK) and organic. Organic fertilizers were obtained by diluting in water four organic composts from agroindustrial-waste composting processes. After obtaining composts, water dilution was performed, adjusting the nutritive solution electrical conductivity values. Gerbera plants were assessed fortnightly (0, 14, 28, 42, and 56 days after acclimatization) for leaf area and shoot dry matter, which were adjusted for time using the ANACRES program to obtain the leaf area ratio (LAR), relative growth rate (RGR), and net assimilation rate (NAR). Fifty-six days after acclimatization, plants were assessed for number of leaves, plant diameter, leaf area, leaves and inflorescences dry phytomass, stem height, head diameter, and stem diameter. The highest relative growth rates were obtained in plants grown with organic compost in treatment 3. However, the net assimilation rate, which indicates dry matter conversion efficiency, was highest in plants with chemical fertilization (treatment 1).

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Section: Resultsmentioning

confidence: 99%

Growth Analysis of Potted Gerbera Conducted With Mineral Fertilization and Organic Fertigation

et al. 2016

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“…With the increase in the vulnerability of agricultural production due to the expansion of semiarid areas and the increase in the global demand for animal products, it is necessary to adopt strategies that make animal production feasible in semiarid regions (MARENGO, 2008;IPCC, 2014). The development and growth of the forage plant vary according to the growth stage, species, cultivar and availability of abiotic growth factors (DARTORA et al, 2013;MOREIRA et al, 2015;MARANHÃO et al, 2018a). It is emphasised that rainfall is the main abiotic modulator of growth of forages under rainfed conditions, since it is commonly seen as an abiotic factor that is more limiting to plant growth and development in semiarid regions.…”

Section: Introductionmentioning

confidence: 99%

Growth indexes of Pennisetum purpureum cv. Roxo cultivated in different seasons under rainfed conditions

Maranhão

Lopes

Alves

et al. 2020

Rev. bras. saúde prod. anim.

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The objective was to estimate the growth indexes of elephant grass cv. Roxo managed under rainfed conditions in different growing seasons. Seven growth ages (9, 18, 27, 36, 45, 54, and 63 days) were evaluated in three growing seasons (rainy, transition and dry). A completely randomised design was adopted, with split-plot arrangement with time repeated measures, with the ages being the plots and the seasons the subplots. Interaction of age x season was observed. The specific leaf area mean was 0.0286 ± 0.0039 during the rainy season. In the transition season, it adjusted to a third-degree polynomial model; in the dry season it declined linearly (0.0003 m2 g-1). The leaf weight ratio adjusted to the third-degree polynomial model in the rainy and dry seasons, and in the transition season it was maximised at 28 DAC (0.694 g g-1). The leaf area ratio continuously declined in the rainy season. In the transition and dry seasons, it adjusted to the third-degree polynomial model. The net assimilation rate presented averages of 3.73 ± 2.50 and 3.63 ± 1.48 g m-2 day-1 in the rainy and transition seasons, respectively. In the dry season, it was minimised at 48.4 days. The relative growth rate mean was 0.0075 ± 0.0037 during the rainy season. In the transition and dry seasons, it adjusted to the third-degree polynomial model. The growth index rates of elephant grass cv. Roxo are modified by growing seasons, and the pattern and magnitude of the response varies throughout the growth cycle.

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Collard green yield and nutritional quality with mineral and organic fertilization

Steiner

Zuffo

Echer

et al. 2019

SCA

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A study was conducted to investigate the effect of organic and mineral fertilization on collard green yield, and to assess the macro and micronutrient and heavy metal concentrations of its leaves to assess the potential hazards of manure use. Collard plants (Brassica oleracea var. acephala, cv. couve-manteiga) were grown in 4-L pots filled with a clay soil under greenhouse conditions. The experimental design used was completely randomized design and the treatments in a 3 × 4 factorial arrangement: three N sources (pig slurry, poultry manure, and urea) and four N rates (0, 100, 200 and 300 mg kg-1), with four replicates. Collard greens leaves were harvested 70 days after seedling plantings. The manure application (pig slurry or poultry manure) resulted in collard yield equivalent to the application of mineral fertilizer. However, the pig slurry application resulted in an increase of leaf Fe, Mn, Zn, Cd, Cr, and Pb concentrations. Nitrogen application rates up to 300 mg N kg-1 result in the higher yield and nutritional quality of collard leaves. The application of high rates of manure, especially pig slurry, results in the increase of heavy metal (Cd, Cr, and Pb) concentrations. However, the maximum concentrations of 0.042 mg kg-1 Cd, 0.034 mg kg-1 Cr and 0.030 mg kg-1 Pb are well lower than maximum daily intake limit established by the Brazilian legislation, indicating that the consumption of collards from organic production systems with the manure application can be considered safe and without risk to human health.

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Análise de crescimento e produtividade do pak choi cultivado sob diferentes doses de nitrogênio

Cited by 3 publications

References 11 publications

Growth Analysis of Potted Gerbera Conducted With Mineral Fertilization and Organic Fertigation

Growth Analysis of Potted Gerbera Conducted With Mineral Fertilization and Organic Fertigation

Growth indexes of Pennisetum purpureum cv. Roxo cultivated in different seasons under rainfed conditions

Collard green yield and nutritional quality with mineral and organic fertilization

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