COMPARAÇÃO DE MÉTODOS DE ESTIMAÇÃO DO TAMANHO ÓTIMO DE PARCELA EM MILHETO, CROTALÁRIA OCHROLEUCA E CROTALÁRIA SPECTABILIS

Alberto Cargnelutti Filho; Marcos Vinícius Loregian; Valéria Escaio Bubans; Felipe Manfio Somavilla; Samanta Luiza da Costa

doi:10.1590/1983-21252021v34n201rc

Authors

Alberto Cargnelutti Filho Department of Plant Sciences, Universidade Federal de Santa Maria, RS https://orcid.org/0000-0002-8608-9960
Marcos Vinícius Loregian Postgraduate Program in Agronomy, Universidade Federal de Santa Maria, Santa Maria, RS https://orcid.org/0000-0003-2056-3268
Valéria Escaio Bubans Postgraduate Program in Agronomy, Universidade Federal de Santa Maria, Santa Maria, RS https://orcid.org/0000-0002-4188-0839
Felipe Manfio Somavilla Graduate in Agronomy, Universidade Federal de Santa Maria, Santa Maria, RS https://orcid.org/0000-0002-1648-0219
Samanta Luiza da Costa Graduate in Agronomy, Universidade Federal de Santa Maria, Santa Maria, RS https://orcid.org/0000-0002-9266-6816

DOI:

https://doi.org/10.1590/1983-21252021v34n201rc

Keywords:

Uniformity trial. Intercropping. Estimation models.

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.

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