Yield data and Nitrogen fertilizer treatment with field characteristics for the Las Rosas farm, Rio Cuarto, Cordoba, Argentina, 1999 (Rosas1999) and 2001 (Rosas2001).
Two files: one for 1999, one for 2001 - the locations do not match across years), includes lat-lon of grid centroids.
- Observations = 1,738 (1999) and 1,705 (2001)
- Variables = 34 (1999) and 26 (2001)
- Years = 1999, 2001
Source
Rodolfo Bongiovanni, Instituto Nacional de Tecnologia Agropecuaria (INTA), Manfredi, Cordoba, Argentina, rodolfo_bongiovanni@yahoo.com
References:
Bongiovanni, R. (2002). A spatial econometric approach to the economics of site-specific Nitrogen management in corn production. Ph.D. Dissertation, Purdue University.
Anselin, L., R. Bongiovanni, J. Lowenberg-DeBoer (2004). A spatial econometric approach to the economics of site-specific Nitrogen management in corn production. American Journal of Agricultural Economics (forthcoming).
| Variable | Description |
|---|---|
| ID | Identifier |
| TOP2 | Topography dummy, Slope E |
| TOP3 | Topography dummy, Hilltop |
| TOP4 | Topography dummy, Slope W |
| NXTOPz | Interaction Nitrogen and topography zone (z: from 2 to 4) |
| LONGITUDE | Longitude |
| LATITUDE | Latitude |
| OBS | Observation number |
| YIELD | Corn yield (quintals per hectare) |
| N | Nitrogen fertilizer application (kg per hectare) |
| N2 | Nitrogen squared |
| TOPO | Zone: Low E (1), Slope E (2), Hilltop (3), Slope W (4) |
| BV | Brightness value (proxy for low organic matter content) |
| BV2 | Brightness squared |
| NXBV | Interaction Nitrogen - brightness |
| BVXT2z | Interaction brightness and topographic zone (z: from 2 to 4) |
| BV2XTz | Interaction squared brightness and topographic zone (z: from 2 to 4) |
| SAT (99) | Red to NIR ratio (proxy for low organic matter content) |
| SAT2 (99) | SAT squared |
| NXSAT (99) | Interaction Nitrogen - Red to NIR ratio |
| SATXTz (99) | Interaction Sat - topographic zone (z: from 2 to 4) |
| SAT2XTz (99) | Interaction Sat squared - topographic zone (z: from 2 to 4) |
Year in parentheses indicates variable is unique to that year.
Prepared by Luc Anselin. Last updated November 3, 2003. Data provided “as is,” no warranties.