Basic experimental unit and plot sizes for fresh matter of sunn hemp

Facco, Giovani; Filho, Alberto Cargnelutti; Lavezo, André; Schabarum, Denison Esequiel; Chaves, Gabriela Görgen; Silveira, Daniela Lixinski

doi:10.1590/0103-8478cr20170660

Cited by 7 publications

(11 citation statements)

References 15 publications

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“…This size can be calculated using data from uniformity trials (blank experiments) of this same crop by different methods. Plot size has been investigated in the common cultivar of pearl millet (Pennisetum glaucum L.) (BURIN et al, 2015(BURIN et al, , 2016 and sunn hemp (Crotalaria juncea L.) (FACCO et al, 2017) using the maximum curvature of the model of the coefficient of variation (PARANAÍBA; FERREIRA; , and in C. juncea (FACCO et al, 2018) using the modified maximum curvature method (MEIER; LESSMAN, 1971).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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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Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…The possibility that the low sunn hemp SDM values in our study are due to the anticipation of flowering in our region is confirmed by studies with sunn hemp in the state of Rio Grande do Sul. In one locality (29°42' S, 53°49' W), Facco et al (2018) observes that the time until flowering increased from 97 to 110 d, when sowing is performed in October or December, months in which there is an increase in day length. In another location (29°05' S, 53°12' W), Pereira et al (2017) observes 120 d until flowering and obtains SDM of 22.71 t ha -1 when sowing is performed in December.…”

Section: Resultsmentioning

confidence: 99%

“…Sunn hemp is characterized by rapid growth, tolerance to water stress, low soil fertility requirements, and it is able to fix from 78 to 183 kg ha -1 of nitrogen into nitrogen oxides that produce ammonia, nitrites and nitrates. In addition, it can control nematodes and weeds (Espíndola et al, 2005;Silva et al, 2007;Teodoro et al, 2016;Facco et al, 2018). Sunn hemp is indicated for remediating degraded areas, including compacted soils (Pacheco et al, 2015;Pereira et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Biomass of Crotalaria juncea as a function of plant densities in the semiarid region of Northeastern Brazil

Miranda

Vanomark²,

Melo³

et al. 2020

Agron. colomb.

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An increase in the production per area of sunn hemp (Crotalaria juncea L.) biomass in order to expand its beneficial effects as green manure is an objective for the agronomic management of this species. Three experiments were performed during consecutive years to test the following plant densities per m-2: 10, 20, 30, and 40; 25, 35, 50, and 100; 25, 50, 75, and 100. For each density the spacing between the sowing rows and withinthe rows was equal. The experiments were conducted at Mossoro, RN, Brazil, with a randomized complete block design of four replicates. For each experiment, we determined the shoot dry mass and root dry mass per hectare and the ratio between the values per hectare of shoot dry mass and seed rate. Data were subjected to analysis of variance (F test) and regression analysis. The increasing linear behavior of shoot and root biomass of sunn hemp as a function of plant density establishes a recommendation of 100 plants m-2 with equal spacing in the sowing row and between rows. However, the amount of dry mass produced by each kg of seeds decreased to the density of 90 plants m-2. The amount of biomass produced was limited by the length of the vegetative phase of sunn hemp during day length conditions at Mossoro.

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“…Paludo et al (2015) further explained that the modified maximum curvature method, despite its algebraic precision at determining the optimum plot size, estimates smaller plot sizes than other estimating methods, but with a better R 2 . Additionally, this method allows estimating intermediate plot sizes in comparison with pre-established basic unit plot sizes (Facco et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

“…The modified maximum curvature method associates through a power regression equation the coefficients of variation between plots with their respective sizes (Facco et al, 2018). Using Hatheway's method, convenient plot sizes are estimated through a combination matrix (Sousa et al, 2016).…”

Section: Models For Estimation Of Experimental Plot Sizementioning

confidence: 99%

Methods for Estimating Optimum Plot Size for ‘Gigante’ Cactus Pear

Guimarães¹,

Donato²,

Aspiazú³

et al. 2019

JAS

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The optimum plot size for ‘Gigante’ cactus pear can be estimated by several methods; thus, ultimately aiming for efficiency, simple use and high precision, the objective of this study was to compare methods for estimating plot sizes: modified maximum curvature method, Hatheway’s convenient plot size method, linear and quadratic response plateau models, and comparison of variances method for evaluating phenotypic characteristics in experiments with ‘Gigante’ cactus pear. Plot sizes were estimated by conducting a uniformity trial. Estimated optimum plot sizes varied with the method and vegetative characteristic. The quadratic response plateau regression estimated the largest plot sizes, whereas Hatheway’s method estimated the smallest plot sizes. Comparison of variances method estimated intermediate plot sizes in comparison with the other methods for most measured characteristics. Plots sizes estimated by modified maximum curvature method are more consistent with results reported by studies on ‘Gigante’ cactus pear. 10 basic unit plot sizes estimated by the linear response plateau model can be used with high precision and practical feasibility for growing cactus pear, thereby improving the use of resources.

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Basic experimental unit and plot sizes for fresh matter of sunn hemp

Cited by 7 publications

References 15 publications

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

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

Biomass of Crotalaria juncea as a function of plant densities in the semiarid region of Northeastern Brazil

Methods for Estimating Optimum Plot Size for ‘Gigante’ Cactus Pear

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