| Autor: |
Maurício Roberto Cherubin, Antônio Luis Santi, Mateus Tonini Eitelwein, Clovis Orlando Da Ros, Mateus Bortoluzi Bisognin |
| Jazyk: |
English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Revista Ciência Agronômica, Vol 45, Iss 4, Pp 659-672 (2014) |
| Druh dokumentu: |
article |
| ISSN: |
1806-6690 |
| Popis: |
Knowledge of spatial variability is an important factor to be considered in planning a program of soil sampling and crop management under precision agriculture (PA). In this context, the aim of this work was to evaluate the efficiency of the dimensions of sampling grids used in the state of Rio Grande do Sul (RS), Brazil to characterise the spatial variability of the attributes pHwater, base saturation (V%), calcium (Ca) and magnesium (Mg) levels. The study was carried out on 30 agricultural sites located in the northern region of RS, having soils classified as Oxisols and managed using the tools of PA. The dimensions of the grids under study were: 100 x 100 m (10 areas), 142 x 142 m (10 areas) and 173 x 173 m (10 areas). Soil was collected at a depth of 0.00 to 0.10 m. The data for pHwater, V%, Ca and Mg were subjected to exploratory statistical analysis and to geostatistical analysis by means of semivariograms. The areas showed high Ca (>4.0 cmol c dm-3) and Mg (>1.0 cmol c dm-3) levels and localised problems of soil acidity (pHwater |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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