Yield and Fertilizer in Las Rosas farm (Argentina) (1999 and 2001)

Yield data and Nitrogen fertilizer treatment with field characteristics for Las Rosas farm, Rio Cuarto, Cordoba, Argentina, 1999 and 2001. Use list2env(lasrosas, .GlobalEnv) to unlist in working environment. The data consist of a list of two objects:

• lasrosas99 A spatial points object of class sf Dataframe with information from 1999.

• lasrosas01 A spatial points object of class sf Dataframe with information from 2001.

lasrosas

Format

lasrosas99 includes points with 1,738 rows, 34 variables, and a geometry column. lasrosas01 includes points with 1,705 rows, 26 variables, and a geometry column:

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)

Source

Rodolfo Bongiovanni, Instituto Nacional de Tecnologia Agropecuaria (INTA), Manfredi, Cordoba, Argentina, (rodolfo_bongiovanni@yahoo.com)

Details

List of two Sf objects, unprojected. The CRS of lasrosas99 is EPSG 4326: WGS84. The data lasrosas99 has an undefined Coordinate Reference System.

Examples