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Sample size to estimate biomass and productivity of Canavalia ensiformis and Dolichos lablab. Tamanho da amostra para estimativa da biomassa e produtividade de Canavalia ensiformis e Dolichos lablab.
Teodoro 1Larissa P. Green manure brings numerous benefits that promote essentially the maintenance and conservation of agro-systems, and its implementation is fundamental to Brazilian Cerrado region.
In this scenario, the present research aimed morettib determine the sample size for the estimation of biomass and productivity expected values of Canavalia ensiformis and Dolichos lablab. Forty five plants were randomly selected in the experimental area of each crop to determine fresh mass, dry mass and yield.
Measures of central tendency, variability, asymmetry and kurtosis were calculated and normality of the variables under study basic checked by the Lilliefors test. The Cerrado occupation has occurred quickly, based on intensive production systems, which have increased the processes of soil degradation Silva et al.
These processes result morettih impacts that often generate the inefficiency of agricultural systems, with frequent need for interventions estatitsica conservation practices to maintain the productive potential of the soil.
In this context, green manure becomes fundamental to the Cerrado region, because it promotes protection, improvement and maintenance of soil quality, as well as substantial increases in soil organic matter and nutrients, benefiting agroecosystems Carvalho et al. Among the desirable characteristics for selection of species for green manure, stands out mainly dry mass production, because it is related to the capacity to increase nutrient by symbiosis with microorganisms, soil cover and recycling of nutrients Chaves and Calegari, Among the various botanical families species that can be grown as green manures, stand out those of the Fabaceae family.
The legumes, in addition to providing similar benefits d other species, have the ability to accumulate D through biological fixation Silva et al. According to Teodoro et al. In the Cerrado of Central Brazil is sown until the end of the rainy season, because of drought resistance and little sensitivity to photoperiod Calegari et al.
In agricultural systems in areas of Cerrado are used intercropped with maize and perennial crops, because tolerates partial shade Carvalho and Amabile, Although the data can produce reliable results in a given study, it is important to determine the sample size in order to estimate the average of each variable, with high confidence and a given estimation error.
The sample size is directly proportional to the variability of the variables under study and to the desired confidence degree in the estimate and inversely proportional mkrettin the estimation error allowed, initially established by the researcher Bar-betta bussah al.
Thus, the objective of this research was to determine the sample size to estimate biomass and productivity of C. The spacing used was 0.
No base fertilization and coverage for any culture were used. At maturation, 45 plants were randomly selected in the experimental esttatistica of each crop to determine fresh mass, dry mass and productivity. Data were extrapolated to t ha -1and measures of central tendency, variability, asymmetry and kurtosis were calculated and normality of the variables under study was checked by Lilliefors test Campos, The calculation of central tendency, variability, asymmetry, kurtosis and Lilliefors test relatively to morphological variables fresh mass, dry mass and C.
However, according to the central limit theorem, even if the basic population is not normal, the moretttin of the sample mean will be approximately normal for samples greater than 30 observations Fonseca and Martins, ; Bussab and Morettin, Given these considerations in relation to normality, it can be inferred that the data from these variables provide credibility to the scaling of the sample size study.
Analyzing the variation coefficient of both green manures verifies a superior magnitude of fresh and dry masses and productivity, suggesting the need of higher sample sizes for the estimation of the fresh and dry mass relative to average productivity. Moreover, the statistical values revealed existence of genetic variability among C. Variables evaluated in C.
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These results showed lower magnitude than those observed by Melo that in evaluating the fresh and dry mass production in different green manures did not identify statistical difference in the C. It is important to mention that given the observed results, the jack bean provides greater dry mass production and consequently greater soil cover in relation to D.
Moreover, this is a crop that can be considered for family farms because of its high seed production and high prices in the market. Sample size to estimate the average of each character in C. These results confirm the variability among the variables and among green manure species, corroborating the results obtained by Cargnelutti Filho et al.
From a practical standpoint, it can be inferred that it is difficult to obtain average estimates of the variables evaluated in C. It does not fit in this study the judgment of maximum estimation error acceptable, getting the use this information to the researcher for his experimental design.
Considering these same parameters for the D. However, other factors must be analyzed for planning experiments with these green manures, such as seed germination, plant density, spacing to be used and type of harvesting and weeding manual or mechanical.
Canavalia ensiformi showed significant higher values for the mean fresh mass moreytin, dry mass and productivity in relation to Dolichos lablabbeing recommended for cultivation in Brazilian Cerrado.
Embrapa Cerrados, 28 p. Densidades de semeadura de leguminosas na melhoria da qualidade do solo e na produtividade do milho. Porto Alegre, Bookman, p.
BUSSAB E MORETTIN Estatística Básica 6a Edição ( 1)
Introduction The Cerrado occupation has occurred quickly, based on intensive production systems, which have morfttin the processes of soil degradation Silva et al. Results and Discussion The calculation of central tendency, variability, asymmetry, kurtosis and Lilliefors test relatively to morphological variables fresh mass, dry mass and C. Conclusions Canavalia ensiformi showed significant higher values for the mean fresh mass production, dry mass and productivity in relation to Dolichos lablabbeing recommended for cultivation in Brazilian Cerrado.
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