Optimum Size and Shape of Experimental Units for Cassava Cropping
Janilson Pinheiro de Assis *
Department of Agronomic and Forestry Sciences, Federal Rural Semi-Arid University, Jitirana Research Group, Mossoró-RN, 59625-900, Brazil.
Roberto Pequeno de Sousa
Department of Agronomic and Forestry Sciences, Federal Rural Semi-Arid University, Jitirana Research Group, Mossoró-RN, 59625-900, Brazil.
Walter Martins Rodrigues
Center of Exact and Natural Sciences, Federal Rural Semi-Arid University, Mossoró-RN, 59625-900, Brazil.
Paulo César Ferreira Linhares
Department of Agronomic and Forestry Sciences, Federal Rural Semi-Arid University, Jitirana Research Group, Mossoró-RN, 59625-900, Brazil.
Eudes de Almeida Cardoso
Department of Agronomic and Forestry Sciences, Federal Rural Semi-Arid University, Jitirana Research Group, Mossoró-RN, 59625-900, Brazil.
Maria Francisca Soares Pereira
Green Group of Agroecology and Bees, Pombal-PB, 58540-000, Brazil.
José Aluisio de Araújo Paula
Brazilian Service to Support Micro and Small Enterprises, Mossoró-RN, 59600-230, Brazil
Ariana da Mota Oliveira
PPGSA-CCTA- Federal University of Campina Grande, Pombal-PB, 58840-000, Brazil.
*Author to whom correspondence should be addressed.
Abstract
In agricultural experimentation, the right size and shape of experimental units increase the precision of the experiment. This study determines the optimum size and shape of the experimental unit for field experimentation with cassava. For this, we carried out a uniformity test in Pacajús, Ceará, under dry conditions, with the cultivar 'Mastruço' planted at a spacing of 1.00 m x 0.60 m. The root yields were collected in 15 rows with 40 plants each, comprising 31 types of experimental units of 23 different pre-established sizes. The optimum size of the experimental unit was estimated by the Hatheway method, and the shape was determined by the relative information method. The Hatheway method indicated several optimum sizes of experimental units, many of which were applicable for evaluation experiments of cassava cultivars. The 15 x 1 rectangular experimental unit (15 rows with one plant and 9.00 m² of useful area) was considered the ideal shape for assessment of cassava production, which was smaller than the size suggested in surveys with of cassava cropping. There was a continuous nonlinear reduction of the coefficient of variation with the increase in plot size.
Keywords: Manihot esculenta Crantz, Hatheway's method, method of relative information.