Comparison of Methods for Estimating the Optimum Plot Size for Pearl Millet, Slender Leaf Rattlebox, and Showy Rattlebox

Abstract

This study aimed to compare three methods of estimating the optimum plot size to evaluate the fresh matter productivity of pearl millet (Pennisetum glaucum L.), slender leaf rattlebox (Crotalaria ochroleuca), and showy rattlebox (Crotalaria spectabilis). Twenty-seven uniformity trials were carried out with pearl millet, slender leaf rattlebox, and showy rattlebox cultivated alone and intercropped. Fresh matter productivity was evaluated in 972 basic experimental units (BEU) of 1 m × 1 m (36 BEU per trial). The optimum plot size was determined using the methods modified maximum curvature, linear response with plateau model, and quadratic response with plateau model. The optimum plot size differs between methods and decreases in the following order: quadratic response with plateau model (9.94 m2), linear response with plateau model (7.41 m2), and modified maximum curvature (3.49 m2). The optimum plot size to evaluate the fresh matter productivity of pearl millet, slender leaf rattlebox, and showy rattlebox cultivated alone or intercropped is 7.41 m2. This size could be used as a reference for future experiments.

Optimal plot size in forage sorghum with comparison of the methods of modified maximum curvature, linear response and plateau model and quadratic response and plateau model

“…Results similar to those of the present study, i.e., decreasing estimates of Xo in the following order: quadratic response and plateau model, linear response and plateau model and modified maximum curvature, have been obtained in radish (SILVA et al, 2012), sweet potato (GONZÁLEZ et al, 2018, millet + slender leaf rattlebox + showy rattlebox (CARGNELUTTI FILHO et al, 2021a) and buckwheat (CARGNELUTTI FILHO et al, 2021b).…”

“…Comparative studies involving the MMC, LRP and QRP methods have been conducted with radish (SILVA et al, 2012), sweet potato (GONZÁLEZ et al, 2018, millet + slender leaf rattlebox + showy rattlebox (CARGNELUTTI FILHO et al, 2021a) and buckwheat (CARGNELUTTI FILHO et al, 2021b), evidencing distinct results between the methods. Plot size determinations to evaluate the grain yield of grain sorghum have been carried out by Lopes et al (2005) and Brum et al (2008).…”

Tamanho ótimo de parcela em aveia branca com comparação de três métodos

“…The values of CV (X) as a function of X can be related by the methods of modified maximum curvature (MMC) (Meier & Lessman, 1971), linear response and plateau model (LRP) (Paranaíba et al, 2009) and quadratic response and plateau model (QRP) (Peixoto et al, 2011), and make it possible to determine the optimal plot size (Xo) and the coefficient of variation in the optimal plot size (CV Xo ). Comparative studies involving the MMC and LRP methods have been carried out with papaya (Brito et al, 2012), pineapple (Leonardo et al, 2014), cabbage (Guarçoni et al, 2017) and cassava (Sousa et al, 2018), the LRP e QRP methods with passion fruit (Peixoto et al, 2011) and MMC, LRP and QRP methods with radish (Silva et al, 2012), sweet potato (González et al, 2018), cactus pear (Guimarães et al, 2019), coffee (Moreira et al, 2016, Brioschi et al, 2020, millet + slender leaf rattlebox + showy rattlebox (Cargnelutti et al, 2021a) and buckwheat (Cargnelutti et al, 2021b), evidencing distinct results between the methods and the importance of using more than one method to determine the optimal plot size.…”

Tamanho Ótimo De Parcela Em Ervilha Forrageira

“…Pesquisas evidenciam que com o aumento do tamanho de parcela há diminuição não linear do coeficiente de variação (CARGNELUTTI FILHO et al, 2021a, 2021b, ou seja, melhoria da precisão experimental. Diante desse padrão de resposta, é possível utilizar dados de ensaios de uniformidade (experimentos em branco) e planejar distintos tamanhos de parcela (X) pelo agrupamento de unidades experimentais básicas (UEB) adjacentes e estimar o coeficiente de variação (CV(X)) entre as UEB.…”

“…Resultados distintos entre os métodos CMM, LRP e QRP têm sido obtidos nas culturas de maracujazeiro (PEIXOTO; FARIA; MORAIS, 2011); rabanete (SILVA et al, 2012); cafeeiro (MOREIRA et al, 2016); batata doce (GONZÁLEZ et al, 2018); repolho (GUARÇONI et al, 2017); palma forrageira (GUIMARÃES et al, 2019); milheto + crotalária ochroleuca + crotalária spectabilis (CARGNELUTTI FILHO et al, 2021a); e trigo mourisco (CARGNELUTTI FILHO et al, 2021b), evidenciando a importância de utilizar mais de um método na determinação do tamanho ótimo de parcela.…”