Influência dos elementos meteorológicos na produção de adubos verdes, em diferentes épocas de semeadura

Santos, Vanderley S. dos; Júnior, José Holanda Campelo

doi:10.1590/s1415-43662003000100015

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…9;2018 There is a reduction of the vegetative cycle with the reduction of the crop cycle, which causes a smaller plant growth period. Results obtained by Santos and Campelo Júnior (2003) demonstrated reduced fresh and dry matter of sunn hemp in later plantings, as well as in experiments performed by Timossi et al (2014). Both authors attribute these effects to photoperiod reduction in cropping cycles with later sowing.…”

Section: Resultssupporting

confidence: 74%

“…However, we assumed that the sample sizes for the productive traits of this crop cultivated at different sowing dates in the Brazilian subtropical region, site of this study, are different from those obtained by Teodoro et al (2015) because of the influence of environmental factors and sowing dates on the growth and development of sunn hemp plants (Santos & Campelo Júnior, 2003;Timossi, Teixeira, Cava, Goularte, & Nascimento, 2014). We emphasize that reduced sample size can compromise the reliability of the results of the experiments.…”

Section: Introductionmentioning

confidence: 99%

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Sample Sufficiency for Mean Estimation of Productive Traits of Sunn Hemp

Schabarum¹,

Filho²,

de³

et al. 2018

JAS

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Sunn hemp (Crotalaria juncea L.) is an annual cycle legume with high potential for biological nitrogen fixation, being widely used in crop rotation for biomass formation and control of nematodes. The objectives of this study were to determine the sample size for the mean estimation of productive traits of sunn hemp and verify the sample size variability between traits and sowing dates. Two uniformity trials were performed in the agricultural year 2014/2015, with sowing in October (trial 1) and December (trial 2). At the crop flowering stage, 300 plants of each trial were harvested and fresh and dry matter of leaves, stem, root, aerial part, and total weight were evaluated. The normality and randomness tests were performed for each trait and the sample size was calculated for the semi-amplitudes of the confidence interval (estimation errors) of 2, 4, 6, 8, 10, 12, 14, 16, 18 and 20% of the mean estimate. There is sample size variability between productive traits and between sowing dates. The assessment of at least 101 plants is required for mean estimation of productive traits with maximum estimation error of 20% of the mean and 95% confidence level.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Sample Sufficiency for Mean Estimation of Productive Traits of Sunn Hemp

Schabarum¹,

Filho²,

de³

et al. 2018

JAS

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“…In our case, the field in Araponga faces West and the plot in Pedra Dourada South, so the daylight duration on the field in Araponga is longer, the soil drier, and the adapted plants tend to develop faster. The differences in nutrient content between locations for the same species can be attributed to the ability of each species to adapt to microclimatic conditions (Santos & Campelo Júnior, 2003).…”

Section: Nutrients In Green Manure Biomassmentioning

confidence: 99%

Green manure in coffee systems in the region of Zona da Mata, Minas Gerais: characteristics and kinetics of carbon and nitrogen mineralization

Matos

Mendonça

Lima³

et al. 2008

Rev. Bras. Ciênc. Solo

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SUMMARYThe use of green manure may contribute to reduce soil erosion and increase the soil organic matter content and N availability in coffee plantations in the Zona da Mata, State of Minas Gerais, in Southeastern Brazil. The potential of four legumes (A. pintoi, C. mucunoides, S. aterrimum and S. guianensis) to produce above-ground biomass, accumulate nutrients and mineralize N was studied in two coffee plantations of subsistence farmers under different climate conditions. The biomass production of C. mucunoides was influenced by the shade of the coffee plantation. C. mucunoides tended to mineralize more N than the other legumes due to the low polyphenol content and polyphenol/N ratio. In the first year, the crop establishment of A. pintoi in the area took longer than of the other legumes, resulting in lower biomass production and N 2 fixation. In the long term, cellulose was the main factor controlling N mineralization. The biochemical characteristics, nutrient accumulation and biomass production of the legumes were greatly influenced by the altitude and position of the area relative to the sun.

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“…Similar results were reported by Timossi, Teixeira and Cava (2014), who found that late sunn hemp sowing shortened vegetative growth and the time to flowering. Santos and Júnior (2003) noted that late sowing decreased mean plant height. The yield reductions were attributed to the sensitivity of this crop to photoperiod (Alcântara, Furtini Neto, Paula, Mesquita, & Muniz, 2000).…”

Section: Resultsmentioning

confidence: 99%

Sample Size for Morphological Traits of Sunn Hemp

Schabarum¹,

Filho²,

Lavezo³

et al. 2017

JAS

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Sunn hemp (Crotalaria juncea L.) is an annual leguminous plant used for crop rotation, biomass formation, biological nitrogen fixation, and nematode control. To this end, sampling is an important tool owing to its advantages, such as low cost and fast data acquisition. This study aimed to determine the sample size required to estimate the mean morphological traits of sunn hemp and to assess sample size variability among traits, crop development stages, and sowing seasons. Two uniformity trials were performed in the field during the 2014/2015 harvest. Crops were sown in October and December on an experimental area of the Department of Crop Science at the Federal University of Santa Maria, Brazil. An area of 1,200 m 2 was allocated for each trial. Each trial was divided into 2 m × 2 m grids, which formed 25 rows and 12 columns. One plant was marked per plot, totaling 300 plants in each trial. Leaf number and plant height were assessed weekly. Stem diameter and root length were measured at flowering. Normality and randomness tests were performed on each trait. The sample sizes (plants number) were calculated for the confidence interval half-widths (estimation errors) of the 2, 4, …, 20% mean estimates. There is variability of the sample size (plants number) between morphological traits, crop development stages, and sowing seasons. When choosing a single sample size to evaluate the morphological traits of sunn hemp, at least 70 plants should be sampled for an accuracy of 10% and a 95% confidence level.

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Influência dos elementos meteorológicos na produção de adubos verdes, em diferentes épocas de semeadura

Cited by 12 publications

References 10 publications

Sample Sufficiency for Mean Estimation of Productive Traits of Sunn Hemp

Sample Sufficiency for Mean Estimation of Productive Traits of Sunn Hemp

Green manure in coffee systems in the region of Zona da Mata, Minas Gerais: characteristics and kinetics of carbon and nitrogen mineralization

Sample Size for Morphological Traits of Sunn Hemp

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