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| Silva,Tiago Santos; Silva,Paulo Sérgio Lima e; Braga,Jéfferson Dantas; Silveira,Lindomar Maria da; Sousa,Roberto Pequeno de. |
| In Mata Fresca, an area located on the border of the states of Rio Grande do Norte and Ceará, in Brazil, small farmers have a source of income from the production of cassava roots, using planting densities of around 5,000 plants ha-1. This procedure might be helping to limit higher yields of the roots, since some studies have shown that it is possible to obtain higher yields of cassava using higher densities. The objective of this study was to evaluate the root yield and other characteristics of the cassava, as a response to planting density. The Vermelhinha cultivar was submitted to planting densities of from 5,000 to 21,000 plants ha-1, at intervals of 2,000 plants ha-1, in an experiment under irrigation. A completely randomized block design with four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Manihot esculenta; Spacing; Plant populations. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000200014 |
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| Sousa,Roberto Pequeno de; Silva,Paulo Sérgio Lima e; Assis,Janilson Pinheiro de. |
| RESUMO Na experimentação agrícola, a utilização do tamanho e da forma adequada de parcela são técnicas experimentais importantes para aumentar a precisão do experimento. Assim, objetivou-se nesse trabalho determinar o tamanho e forma adequada de parcela para experimentação em campo com girassol. Para isso, o experimento foi conduzido em blocos completos casualizados com 14 cultivares de girassol em 10 repetições. As parcelas foram constituídas de quatro fileiras de seis metros de comprimento, espaçadas de 0,7 m e 0,3 m entre plantas. A área útil da parcela (7,56 m2), composta das duas fileiras centrais, foi dividida em 12 unidades básicas, cada uma constituída por três plantas na fileira (0,63 m2), obtendo-se o rendimento de grãos de girassol. O tamanho... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus L; Método de Hathewa; Método da informação relativa. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000400683 |
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| Silva,Paulo Sérgio Lima e; Santos,Luiz Eduardo Barreto dos; Oliveira,Vianney Reinado de; Sousa,Roberto Pequeno de; Fernandes,Patrícia Lianny de Oliveira. |
| In the sunflower, in addition to seed yield, it is of interest to evaluate number of leaves plant-1, head diameter, stem diameter and plant height, since these characteristics may be associated with seed yield or lodging. The objective of the work was to determine the optimal sample size (from which the experimental coefficient of variation, CV, can be established) for evaluation of these four characteristics. Fifteen cultivars were evaluated in an experimental design of randomized blocks with ten replications. The characteristics were evaluated using two sampling methods (in a single row of plants or in the two rows from the useable area of each plot) and sample sizes of from two to 18 sampling units, with an interval of two plants. In the two sampling... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus L.; Plant height; Leaf number; Stem diameter; Head diameter. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100144 |
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| Sousa,Roberto Pequeno de; Silva,Paulo Sérgio Lima e; Assis,Janilson Pinheiro de; Silva,Paulo Igor Barbosa e; Silva,Júlio César do Vale. |
| The aim of this study was to determine a suitable plot size for field experiments with the sunflower. An experiment was carried out in a randomised complete block design with 14 sunflower cultivars and 10 replications. The plots consisted of four rows, six metres in length, spaced 0.7 m apart with 0.3 m between plants. The working area of the plot (7.56 m2), consisting of the two central rows, was divided into 12 basic units, each consisting of three plants per row (0.63 m2), from where the yield of the sunflower seeds was obtained. Suitable plot size was estimated using the intraclass correlation coefficient method. The detectable difference between treatments was also estimated (d). The optimum plot size for the evaluation of grain yield in the sunflower... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus L.; Intraclass correlation coefficient; Breeding. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100170 |
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