| Registro completo |
| Provedor de dados: |
Agronomy
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| País: |
Brazil
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| Título: |
Soil penetration resistance mapping quality: effect of the number of subsamples
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| Autores: |
Pias, Osmar Henrique de Castro
Cherubin, Maurício Roberto
Basso, Claudir José
Santi, Antônio Luis
Molin, José Paulo
Bayer, Cimélio
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| Data: |
2018-02-09
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| Ano: |
2018
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| Palavras-chave: |
Soil compaction
Sampling protocol
Precision agriculture
Microvariability.
Soil compaction
Sampling protocol
Precision agriculture
Microvariability
Física do solo
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| Resumo: |
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 increase in the variability of the SPR data. Generally, the results from this study suggest the use of at least four subsamples per sampling point to achieve SPR maps with a coefficient of relative deviation less than 10% (30% maximum error per point around the mean) and significant correlation with the reference maps (15 subsamples).
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989
10.4025/actasciagron.v40i1.34989
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| Editor: |
Universidade Estadual de Maringá
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| Relação: |
http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989/pdf
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| Formato: |
application/pdf
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| Fonte: |
Acta Scientiarum. Agronomy; Vol 40 (2018): Publicação Contínua; e34989
Acta Scientiarum. Agronomy; v. 40 (2018): Publicação Contínua; e34989
1807-8621
1679-9275
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| Direitos: |
Copyright (c) 2017 Acta Scientiarum. Agronomy
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