Acronym or Term

Definition

CLU

Common Land Unit boundaries (CLUs) are sourced from the Farm Service Agency (FSA) and are effective as of 2008. (Last publicly available data)

CRM

Comparative Relative Maturity

Crop Zone

A field where a specific crop has been assigned.

DAP

Diammonium Phosphate is a phosphorus fertilizer made up of phosphate, sulfur, and ammonium. The standard nutrient grade of DAP is relatively high at 18-46-0.

Decision Zone

What are Decision Zones?

ERU

Environmental Response Unit; it factors in both soil type attributes and irrigation/drainage data.

Fertigation

the amount of liquid nitrogen fertilizer applied during irrigation.

Flat rate application

A consistent rate applied across all Decision Zones (can apply to Nitrogen, seed rates, etc.)

GDU

Growing Degree Unit. Unit of accumulated sunlight.

GPS

Global Positioning System

Inhibitor

A chemical added to nitrogen to reduce nitrogen loss in the soil.

KML

Keyhole Markup Language. XML notation for expressing geographic annotation and visualization in Internet-based, two-dimensional maps and three-dimensional Earth browsers. Used in Google Earth.

MAP

Monoammonium Phosphate (11-52-0). Granular fertilizer that is water soluble and dissolves rapidly in soil if adequate moisture is present. Upon dissolution, the two basic components of the fertilizer separate again to release NH4. + and H2PO4. -. Both of these nutrients are important to sustain healthy plant growth.

MYYA

Multi-Year Yield Analysis combines normalized yield values from corn and soybean crops in prior years to create a composite normalized set of values centered on one (average), with values being higher and lower than one to represent the relative productivity.

NCCPI

National Commodity Crop Productivity Index is an index developed by the NRCS to classify productivity of soils by crop (corn, soybeans, cotton, wheat). The index is on a scale of 0 to 1, with 1 being most productive.

SSURGO

SSURGO (Soil Survey Geographic database) is a collection of digital soil survey data performed by the US Government's National Cooperative Soil Survey performed by the Natural Resources Conservation Service.

Variable rate application

Has rates that vary across a field. In the case of Nitrogen and Stand, the rates can change by Decision Zone location.

VRN

Variable Rate Nitrogen

VRS

Variable Rate Seeding

VT/R1

Vegetative Tassel/Reproductive Stage 1

Yield Goal

A user-defined goal of yield for a field for a given year.

Yield Target

Estimated crop yield at the decision zone level