Desempenho agronômico de plantas de cobertura usadas na proteção do solo no período de pousio

Carvalho, Wellington Pereira de; Carvalho, Gabriel José de; Neto, Dyrson de Oliveira Abbade; Teixeira, Luíz Gustavo Vieira

doi:10.1590/s0100-204x2013000200005

Cited by 31 publications

(25 citation statements)

References 12 publications

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“…In research on this crop, as developed by Cavalcanti (2011), Cavalcante et al (2012), Carvalho et al (2013), and Duarte et al (2013), many traits have been measured with different sample sizes. In order to measure the traits with the desired precision, it is crucial to determine the appropriate sample size.…”

Section: Introductionmentioning

confidence: 99%

Sample size to estimate the mean of traits in jack bean

Filho

Alves

Toebe

et al. 2018

Agraria

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ABSTRACT:In experiments, it is important to evaluate sufficient number of plants, so that inferences have the desired precision. The objective of this research was to determine the sample size (i.e., number of plants) required to estimate the mean of jack bean traits (Canavalia ensiformis) with precision levels. In experimental area of 10 × 16 m (160 m 2 ), 194 plants were collected randomly at 202 days after sowing. The morphological (plant height, stem diameter, number of nodes, and number of leaves) and productive traits (number of pods, fresh matter of pods, fresh matter of aerial part without pods, fresh matter of aerial part, dry matter of pods, dry matter of aerial part without pods, and dry matter of aerial part) were measured in each plant. Measures of central tendency, variability, skewness, and kurtosis were calculated for each trait. The sample size was determined by resampling with replacement of 10,000 resamples. In order to estimate the mean of morphological and productive traits of jack bean with the amplitude of the confidence interval of 95% equal to 40% of the estimated mean, 114 plants are required.

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Section: Introductionmentioning

confidence: 99%

Sample size to estimate the mean of traits in jack bean

Filho

Alves

Toebe

et al. 2018

Agraria

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“…Para avaliar o efeito da adubação nitrogenada sobre a produção de fi tomassa de aveia preta, SANTI et al (2003) TORRES et al (2008), para a avaliação da produção de fi tomassa e mineralização dos resíduos de aveia preta e outras plantas de cobertura, foram utilizadas parcelas de 40m 2 (4m×10m), sendo posteriormente coletadas duas amostras, em uma área de 1m 2 por parcela. Na avaliação do desempenho agronômico de aveia preta e de outras cinco plantas de cobertura, CARVALHO et al (2013) utilizaram parcelas de 16m 2 (4m×4m), com área útil de 9m 2 . Para avaliar os efeitos da densidade e da velocidade de semeadura sobre a produtividade de grãos, componentes do rendimento da aveia preta (DEBIASI et al, 2007) e sobre o crescimento da aveia preta (MARTINS et al , 2008) O tamanho ótimo de parcela pode ser determinado a partir de dados obtidos em experimentos em branco, denominados ensaios de uniformidade, sobre os quais não são aplicados tratamentos (RAMALHO et al, 2005;STORCK et al, 2011).…”

Section: Introductionunclassified

Tamanho de parcela e número de repetições em aveia preta

et al. 2014

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“…Although millet, crotalaria and fallow have obtained better yields of DM in relation to both brachiarias, the net production is still considered low for adequate soil covering (ALVARENGA et al, 2001). Carvalho et al (2013) also found low accumulation of DM in the winter season, where cultivation in Cerrado soil during this period is not favorable for the growth and development of the plants.…”

Section: Performance Of Cover Crops According To Sowing Timementioning

confidence: 85%

Performance of Inoculated Common Bean in Response to Different Cover Crops and Desiccation Times

2017

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-The common bean requires high levels of nitrogen (N) to achieve high productivity, which can be supplied, at least partially, by the biological nitrogen fixation (BFN). Two field experiments were carried out in the winter season of 2015 aiming to evaluate the effects of different cover crops, desiccation times and the agronomic performance of the common bean inoculated with rhizobia. The experiments were assembled in a randomized block design with four replications, in a factorial split-plot arrangement with two additional treatments (5x4x2+2). The factors were composed of five cover crops, four desiccation times, two seed inoculation treatments and two additional controls (TN = 90 Kg N ha -1 and T0 = without N and without inoculation). The variables analyzed in the cover crops were dry mass (DM) and total nitrogen (Total-N). With the common bean, the chlorophyll content (CC), the number of nodules (NN), the nodule dry weight (NDW), the shoot dry weight (SDW), the root dry weight (RDW) and the grain yield (GY) were evaluated. The results showed that the agronomic performance of the common bean was not affected by the desiccation times of the cover crops, although the amount of Total-N accumulated by cover crops was influenced by sowing times. Inoculation of the common bean promoted an increase in the NN, NDW, CC and SDW. Higher GY of the common bean was achieved with its cropping after Brachiaria brizantha, Brachiaria ruziziensis, millet and fallow.Keywords: Phaseolus vulgaris. No tillage system. Biological nitrogen fixation. DESEMPENHO DO FEIJOEIRO-COMUM INOCULADO EM RESPOSTA A DIFERENTES PLANTAS DE COBERTURA E ÉPOCAS DE DESSECAÇÃORESUMO -O feijoeiro-comum requer altos níveis de nitrogênio (N) para alcançar elevadas produtividades, os quais podem ser supridos, ao menos parcialmente, pela fixação biológica de N (FBN). Com o objetivo de avaliar os efeitos de diferentes plantas de cobertura e épocas de dessecação no desempenho agronômico do feijoeiro-comum inoculado com rizóbio, foram conduzidos dois experimentos em campo, na safra de inverno 2015. Os experimentos foram implantados em delineamento de blocos ao acaso com quatro repetições, em esquema fatorial de parcelas sub subdivididas com tratamentos adicionais (5x4x2+2). Os fatores foram: cinco plantas de cobertura, quatro épocas de dessecação, dois tratamentos de inoculação das sementes e duas testemunhas (TN = 90 Kg N ha -1 e T0 = sem N e sem inoculação). As variáveis analisadas nas plantas de cobertura foram massa seca (MS) e nitrogênio total (N-Total). No feijoeiro-comum avaliou-se teor de clorofila (TC), número de nódulos (NN), massa seca de nódulos (MSN), massa seca da parte aérea (MSPA), massa seca de raiz (MSR) e a produção de grãos (PG). Os resultados mostraram que o desempenho agronômico do feijoeiro-comum não foi afetado pelas épocas de dessecação das plantas de cobertura, embora a quantidade de N-Total acumulada pelas plantas de cobertura tenha sido influenciada pela época de semeadura. A inoculação do feijoeiro-comum promoveu aumento do N...

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Desempenho agronômico de plantas de cobertura usadas na proteção do solo no período de pousio

Cited by 31 publications

References 12 publications

Sample size to estimate the mean of traits in jack bean

Sample size to estimate the mean of traits in jack bean

Tamanho de parcela e número de repetições em aveia preta

Performance of Inoculated Common Bean in Response to Different Cover Crops and Desiccation Times

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