Estimating optimum plot size with radiometer for experiments on soybeans treated with fungicide

Abstract

Spectral remote sensing and proximal sensors are important tools for managing the plant-pathogen relationship. The lack of experimental planning and the probability of error in agricultural studies may result in work repetition and, consequently, in financial expenses and costs with human resources. To reduce such problems, determining the optimum size of the experimental plot for treatments is one of the adopted methods. The objective of this study was to estimate the optimum plot size for reflectance in soybeans that were treated with different fungicide levels according to the methods of modified maximum curvature and maximum distance. Reflectance readings were carried out for the soybean crop with a radiometer GreenSeeker®, considering basic units of 0.45 m² in an area of ten rows, 10 m long, for each treatment. Treatments were applied to create a gradient of Asian soybean rust, varying the number of fungicide applications. Data were collected in two phenological stages (R5.5 and R6), obtaining 300 simulations of experimental area for each stage. Based on the results, the use of 5.40 m² plots with a group of three rows, 4 m long, is recommended.

Estimação do tamanho ótimo de parcela e uso de medidas de não linearidade na validação de modelos em experimentos com >i<Passiflora>/i<

“…Diversos métodos são empregados para que se estime o tamanho ótimo de parcelas, como o método da máxima curvatura (Moreira et al, 2016) com a cultura do café; método da máxima curvatura modificado (Michels et al, 2020;Pires et al, 2016;, com as culturas da soja, café, batata doce e repolho, respectivamente; método do modelo linear segmentado com platô Moreira et al, 2016; com batata doce, rabanete, café e repolho, respectivamente; método do modelo quadrático segmentado com platô Moreira et al, 2016) com batata doce e café, respectivamente; método de comparação das variâncias com café; método de Hatheway com girassol e trigo, respectivamente.…”