Abstract
The objective of this study was to determine the optimal plot size to evaluate the mass of fresh matter in millet (Pennisetum glaucum L.) and showy rattlebox (Crotalaria spectabilis Roth.), in scenarios formed by combinations of treatment numbers, repetitions numbers, and levels of experimental precision. Fifteen uniformity trials with millet and showy rattlebox, in single or intercropping, were carried out. The mass of fresh matter was evaluated in 540 basic experimental units (BEU) of 1 × 1 m (15 trials × 36 BEU per trial). The heterogeneity index of Smith (1938) was estimated. The plot size was determined by the method of Hatheway (1961) in scenarios formed by combinations of i treatments (i = 5, 10, 15, 20, and 25), r repetitions (r = 3, 4, 5, 6, 7, 8, 9, and 10), and d precision levels (d = 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20%). To evaluate the mass of fresh matter of millet and showy rattlebox, in single or intercropping, with 5 to 25 treatments and with five repetitions, plots of 10 m² of useful area are sufficient for differences between treatments of 9% of the overall average of the experiment to be considered significant at 0.05 probability.
Highlights
Millet (Pennisetum glaucum L.) and showy rattlebox (Crotalaria spectabilis Roth.) have been studied with respect to soil cover rate, decomposition rate, nutrient content, and phytomass production (Passos et al, 2017; Scavazza et al, 2018; Ferreira et al, 2019; Pfüller et al, 2019)
The objective of this study was to determine the optimal plot size to evaluate the mass of fresh matter in millet (Pennisetum glaucum L.) and showy rattlebox (Crotalaria spectabilis Roth.), in scenarios formed by combinations of treatment numbers, repetitions numbers, and levels of experimental precision
The mass of fresh matter was evaluated in 540 basic experimental units (BEU) of 1 × 1 m (15 trials × 36 BEU per trial)
Summary
Millet (Pennisetum glaucum L.) and showy rattlebox (Crotalaria spectabilis Roth.) have been studied with respect to soil cover rate, decomposition rate, nutrient content, and phytomass production (Passos et al, 2017; Scavazza et al, 2018; Ferreira et al, 2019; Pfüller et al, 2019). The effects on soil chemical and physical properties (Passos et al, 2017; Sousa et al, 2017), nematodes (Debiasi et al, 2016; Nascimento et al, 2020), weeds (São Miguel et al, 2018) and, on soybean (Debiasi et al, 2016; São Miguel et al, 2018) and okra (Nascimento et al, 2020) productivity have been investigated In these researches, beneficial aspects of these ground cover species in single and intercropping were pointed out. These methodologies have been used in sunflower (Sousa et al, 2016), in banana (Donato et al, 2018), in forage palm (Guimarães et al, 2020) and in species with potential for ground cover, such as: velvet bean (Cargnelutti Filho et al, 2014a); forage turnip (Cargnelutti Filho et al, 2014b); flax (Cargnelutti Filho et al, 2018); and black oats with common vetch (Cargnelutti Filho et al, 2020)
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