Yield data and Nitrogen fertilizer treatment with field characteristics for the Las Rosas farm, Rio Cuarto, Cordoba, Argentina, 1999 (Rosas1999) and 2001 (Rosas2001).
Type = polygon shape file (two files: one for 1999, one for 2001, the locations do not match across years), unprojected, lat-lon, includes lat-lon of grid centroids
Observations = 1738 (1999) and 1705 (2001)
Variables = 32 (1999) and 26 (2001)
Rodolfo Bongiovanni, Instituto Nacional de Tecnologia Agropecuaria (INTA), Manfredi, Cordoba, Argentina, rodolfo_bongiovanni@yahoo.com
Reference: Bongiovanni, R. (2002). A spatial econometric approach to the economics of site-specific Nitrogen management in corn production. Ph.D. Dissertation, Purdue University.
Reference: 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).
year in parentheses indicates variable unique to that year
NOTE: variables not necessarily in this order. Check excel header
| Variable | Description |
|---|---|
| Id (01) | identifier |
| Top2,3,4 | topography dummy, Slope E, Hilltop,Slope W |
| Nxtop2 to Nxtop4 | interaction Nitrogen - topography zone |
| N2xtop2 to N2xtop4 | interaction Nitrogen - topography zone |
| Longitude | longitude |
| Latitude | latitude |
| Obs | observation number (only for 1999) |
| 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 |
| Bvxt2 to Bvxt4 | interaction brightness topographic zone |
| Bv2xt2 to Bv2xt4 | interaction squared brightness topographic zone |
| Sat (99) | Red to NIR ratio (proxy for low organic matter content) |
| Sat2 (99) | Sat squared |
| Nxsat (99) | interaction Nitrogen - Red to NIR ratio |
| Satxt2 to Satxt4 (99) | interaction Sat - topographic zone |
| Sat2xt2 to Sat2xt4 (99) | interaction Sat squared - topographic zone |
Prepared by Luc Anselin
UIUC-ACE Spatial Analysis Laboratory
Last updated November 3, 2003