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| Pias, Osmar Henrique de Castro; Cherubin, Maurício Roberto; Basso, Claudir José; Santi, Antônio Luis; Molin, José Paulo; Bayer, Cimélio. |
| There is no consensus in the literature regarding how many subsamples are needed to perform accurate on-farm soil penetration resistance (SPR) mapping. Therefore, the objective of this study was to define the number of subsamples per sampling point needed to quantify the SPR. The experiment was performed in a 4.7 ha area and employed a 50 × 50 m grid system (18 sampling points). The SPR was evaluated using a digital penetrometer in two different years with 1, 2, 3, 4, 5, 6, 9, 12, and 15 subsamples per sampling point. The SPR maps produced with increasing numbers of subsamples were compared to the reference maps (15 subsamples) using the relative deviation coefficient and Pearson´s linear correlation. A reduction in the number of subsamples promoted an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compaction; Sampling protocol; Precision agriculture; Microvariability.; Soil compaction; Sampling protocol; Precision agriculture; Microvariability; Física do solo. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989 |
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| Pavlu, Franz Arthur; Molin, José Paulo. |
| Sphenophorus levis has become a major pest of sugarcane plantations in Brazil, causing significant losses in productivity. Few studies have been conducted on the spatial distribution of this pest in the field, which is essential for the development of sampling plans. We aimed to characterize the spatial distribution of S. levis in sugarcane, defining a reliable, practical and feasible sampling plan, as well as generating application maps for production areas, allowing for comparison of the consumption of inputs in a conventional system with site-specific application. The study was conducted in areas around Piracicaba, Brazil. First, we conducted sampling to evaluate the best sampling density to characterize the spatial dependence. The results showed that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.03.01.00-4 eostatistics; Site-specific application; Precision agriculture; Entomology; Soil pests; Sugarcane weevil Máquinas e Implementos Agrícolas. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/28599 |
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| Pias, Osmar Henrique de Castro; Cherubin, Maurício Roberto; Basso, Claudir José; Santi, Antônio Luis; Molin, José Paulo; Bayer, Cimélio. |
| There is no consensus in the literature regarding how many subsamples are needed to perform accurate on-farm soil penetration resistance (SPR) mapping. Therefore, the objective of this study was to define the number of subsamples per sampling point needed to quantify the SPR. The experiment was performed in a 4.7 ha area and employed a 50 × 50 m grid system (18 sampling points). The SPR was evaluated using a digital penetrometer in two different years with 1, 2, 3, 4, 5, 6, 9, 12, and 15 subsamples per sampling point. The SPR maps produced with increasing numbers of subsamples were compared to the reference maps (15 subsamples) using the relative deviation coefficient and Pearson´s linear correlation. A reduction in the number of subsamples promoted an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compaction; Sampling protocol; Precision agriculture; Microvariability. soil compaction; Sampling protocol; Precision agriculture; Microvariability Física do solo. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989 |
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