Data/hora: 11/06/2024 15:10:17

Provedor de dados: 	1	
País: 	Brazil	
Título: 	Soil penetration resistance mapping quality: effect of the number of subsamples	
Autores: 	Pias, Osmar Henrique de Castro; Cherubin, Maurício Roberto; Basso, Claudir José; Santi, Antônio Luis; Molin, José Paulo; Bayer, Cimélio.	
Data: 	2018-02-09	
Ano: 	2018	
Palavras-chave: 	Soil compaction; Sampling protocol; Precision agriculture; Microvariability. soil compaction; Sampling protocol; Precision agriculture; Microvariability Física do solo.	
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). 	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989

10.4025/actasciagron.v40i1.34989	
Editor: 	Universidade Estadual de Maringá	
Relação: 	http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989/pdf	
Formato: 	application/pdf	
Fonte: 	Acta Scientiarum. Agronomy; v. 40 (2018): Publicação Contínua; e34989

Acta Scientiarum. Agronomy; v. 40 (2018): Publicação Contínua; e34989

1807-8621

1679-9275	
Fonte: 	Direitos autorais 2017 Acta Scientiarum. Agronomy