Rafael Vieira Pezzini

Heterocedasticidade entre fileiras e colheitas de caracteres produtivos de tomate cereja e estimativa do tamanho de parcela

O presente estudo teve por objetivo avaliar a heterocedasticidade entre as fileiras de cultivo e entre as colheitas em tomate cereja cultivado em ambiente protegido e determinar o tamanho otimo de parcela para avaliar as caracteristicas produtivas da cultura. Para isso instalou-se dois ensaios de uniformidade em estufas plasticas, cada uma contendo oito fileiras espacadas 1 m entre si. Utilizou-se o hibrido Lili, e as mudas foram espacadas em 0,5 m. Foram realizadas tres colheitas e as analises foram realizadas com base nas colheitas individuais e agrupadas. A homocedasticidade entre as fileiras de cultivo e entre as colheitas para cada fileira de cultivo foi obtida pelo teste de Bartlett. O tamanho de parcela (em numero de plantas) foi calculado para cada fileira e colheita (individual ou agrupada). Observou-se heterocedasticidade entre as fileiras de cultivo para pelo menos um caractere em todas as colheitas (individuais ou agrupadas). Ocorreu heterocedasticidade entre as colheitas dentro de cada fileira de cultivo para todas as variaveis. Estas duas caracteristicas justificam a necessidade de se estimar o tamanho otimo de parcela para cada situacao. O tamanho de parcela (em numero de plantas) foi diferenciado entre as fileiras e as colheitas, sendo esta estimativa menor quando as tres colheitas sao agrupadas. E recomendado o agrupamento das colheitas e a adocao de parcelas contendo sete plantas de tomate, independente da fileira de cultivo.

Plot size and number of replications to evaluate the grain yield in oat cultivars

The objectives of this study were to determine the optimum plot size (Xo) and the number of replications to evaluate grain yield and verify the variability of Xo among oat cultivars. Thirtytwo uniformity trials of 3 × 3 m were performed, being 8 from each cultivar (URS Charrua, URS Taura, URS Estampa, and URS Corona). Each uniformity trial was divided in 36 basic experimental units (BEU) of 0.5 × 0.5 m. Grain yield was determined in each BEU. The Xo was determined by the method of maximum curvature of the coefficient of variation model. Mean comparisons among cultivars were performed by the Scott-Knott test via bootstrap. The number of replications was calculated by an iterative process until convergence for experiments in completely randomized design (CRD) and randomized block CRop pRoduCTion And MAnAgeMenT Article Plot size and number of replications to evaluate the grain yield in oat cultivars André Lavezo, Alberto Cargnelutti Filho*, Cláudia Marques de Bem, Cláudia Burin, Jéssica Andiara Kleinpaul, Rafael Vieira Pezzini Universidade Federal de Santa Maria Centro de Ciências Rurais Departamento de Fitotecnia Santa Maria (RS), Brazil. *Corresponding author: alberto.cargnelutti.filho@gmail.com Received: Sept. 26, 2016 – Accepted: Dec. 6, 2016 design (RBD). Scenarios formed by i combinations (i = 3, 4, ..., 50) treatments — with d least differences among treatment means to be detected as significant at 5% probability of type I error by Tukey test, expressed as a percentage of the overall experimental mean (d = 10%, 15%, 20%, 25%, 30%, 35%, 40%, and 45%) — were planned. The Xo of 1.57 m2 is enough to evaluate the grain yield in these 4 oat cultivars. Four replications to evaluate grain yield with up to 50 treatments in the experimental designs of CRD and RBD are enough to identify significant differences among treatment means of 40.53% of the overall experimental mean, by Tukey test at 5% probability of type I error.

Phyllochron and leaf appearance rate in oat

Abstract: Phyllochron and leaf appearance rate are both important parameters in the production efficiency of agricultural crops. The objectives of this study were to determine the phyllochron and leaf appearance rate in 4 oat cultivars ( Avena sativa L.) in 3 sowing dates and verify the variability of phyllochron and leaf appearance rate among cultivars and sowing dates. The experimental design was the completely randomized with 12 treatments and 20 repetitions. Treatments were formed by the combination of 4 cultivars (URS Charrua, URS Taura, URS Estampa, and URS Corona) and 3 sowing dates in 2014 (April 28, May 28, and July 14). In each plant (repetition) of each treatment, the number of expanded leaves (NEL) was counted 3 times per week from the first leaf emission until flowering. For each plant, cultivar, and sowing date, linear regression was adjusted between NEL and Crop produCtion And MAnAgeMent - Article Phyllochron and leaf appearance rate in oat Gabriela Gorgen Chaves, Alberto Cargnelutti Filho*, Bruna Mendonca Alves, Andre Lavezo, Cleiton Antonio Wartha, Daniela Barbieri Uliana, Rafael Vieira Pezzini, Jessica Andiara Kleinpaul, Ismael Mario Marcio Neu

Plot size related to numbers of treatments and replications, and experimental precision in dwarf pigeon pea

The aim of this study was to determine the optimum plot size to evaluate the fresh matter of aerial part of dwarf pigeon pea (Cajanus cajan (L.) Millsp), cultivar IAPAR 43 (Aratã), in scenarios formed by combinations of numbers of treatments, number of replications, and precision levels. The fresh matter of aerial part was weighed on basic experimental units of 1 m × 1 m in three uniformity trials with size of 24 m × 12 m (288 m2 in each trial). The soil heterogeneity index of Smith was estimated. Also, the optimum plot size was determined by Hatheway’s method in scenarios formed by combinations of BASIC AREAS Article Plot size related to numbers of treatments and replications, and experimental precision in dwarf pigeon pea Alberto Cargnelutti Filho1*, André Lavezo2, Cláudia Marques de Bem2, Fernanda Carini2, Denison Esequiel Schabarum2, Cirineu Tolfo Bandeira2, Jéssica Andiara Kleinpaul2, Cleiton Antonio Wartha3, Daniela Lixinski Silveira2, Rafael Vieira Pezzini2, Rosana Marzari Thomasi1, Fernanda Martins Simões1, Ismael Mario Márcio Neu2 1.Universidade Federal de Santa Maria Departamento de Fitotecnia Santa Maria (RS), Brazil. 2.Universidade Federal de Santa Maria Programa de Pós-Graduação em Agronomia Santa Maria (RS), Brazil. 3.Universidade Federal de Viçosa Programa de Pós-Graduação em Fitotecnia Viçosa (MG), Brazil. *Corresponding author: alberto.cargnelutti.filho@gmail.com Received: Mar. 15, 2017 – Accepted: May 29, 2017 i treatments (i = 5, 10, 15, and 20), r replications (r = 3, 4, 5, 6, 7 8, 9, and 10), and d precision levels (d = 5%, 10%, 15%, 20%, 25%, and 30%). In experiments designed on randomized block design with 5 to 20 treatments and four replications, plots with 9 m2 were enough to identify significant differences among treatments regarding the fresh matter of aerial part in dwarf pigeon pea at 5% probability of 30% of the experiment overall mean.

Models for leaf area estimation in dwarf pigeon pea by leaf dimensions

Bragantia, Campinas, v. 77, n. 2, p.221-229, 2018 ABSTRACT: This study aims to determine the most suitable model to estimate the leaf area of dwarf pigeon pea in function of the leaf central leaflet dimension. Six samplings of 200 leaves were performed in the first experiment, at 36, 42, 50, 56, 64, and 72 days after emergence (DAE). In the second experiment, seven samplings of 200 leaves were performed at 29, 36, 43, 49, 57, 65, and 70 DAE, totaling 2600 leaves. The length (L) and width (W) of the central leaflet were measured in all leaves composed by left, central, and right leaflets, the product of length times width (LW) was calculated, and the leaf area (Y – sum of left, central, and right leaflet areas) was determined by digital images. Linear, power, quadratic, and cubic models of Y as function of L, W, and LW were BASIC AREAS Article

Plot size and number of repetitions in vetch

). Each trial was divided into 36 basic experimental units (BEU) of 1 m × 1 m, totaling 1,728 BEU. In each BEU, the fresh matter was weighed. The optimum plot size was determined by the method of maximum curvature of the coefficient of variation model. The means were compared among sowing densities by the Scott-Knott’s test. The number of repetitions — for experiments with completely randomized and randomized block designs, in scenarios of i treatments