Global length of growing periods
2017
Reference ID
c99ddb00-88fd-11da-a88f-000d939bc5d8
Metadata
Created on
Apr 26, 2019
Last modified
Apr 26, 2019
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10
Overview
Title
Global length of growing periods
Abstract
A general characterization of moisture conditions is achieved through the concept of length of growing period (LGP), i.e. the period during the year when both moisture availability and temperature are conducive to crop growth. Thus, in a formal sense, LGP refers to the number of days within the period of temperatures above 5°C when moisture conditions are considered adequate.
Under rain-fed conditions, the begin of the LGP is linked to the start of the rainy season. For establishing crops, 0.4 - 0.5 times the level of reference evapotranspiration is considered sufficient to meet water requirements of dryland crops (FAO 1978-81a; 1979; 1992a).
This layer is a result of the Agro-ecological Zones (AEZ) methodology for land productivity assessments and is part of the Global Agro-ecological Zoning Database.
Under rain-fed conditions, the begin of the LGP is linked to the start of the rainy season. For establishing crops, 0.4 - 0.5 times the level of reference evapotranspiration is considered sufficient to meet water requirements of dryland crops (FAO 1978-81a; 1979; 1992a).
This layer is a result of the Agro-ecological Zones (AEZ) methodology for land productivity assessments and is part of the Global Agro-ecological Zoning Database.
Purpose
The AEZ methodology for land productivity assessments follows an environmental approach; it provides a framework for establishing a spatial inventory and database of land resources and crop production potentials. This land resources inventory is used to assess, for specified management conditions and levels of inputs, the suitability of crops/LUTs in relation to both rain-fed and irrigated conditions, and to quantify expected production of cropping activities relevant in the specific agro-ecological context.
Spatial extent
| East | West | North | South |
|---|---|---|---|
| 180 | -180 | 90 | -90 |
Resource Reference System
Keywords
Keywords
| Keyword | Type |
|---|---|
| Agroecological zones | |
| Length of growing period | |
| climate | |
| agroclimatology | |
| World | place |
Contacts
Contact
| Organization | Country | |
|---|---|---|
| FAO-UN - Geospatial Coordination Unit - Climate, Biodiversity, Land and Water Department (CB) | gis-manager@fao.org | Italy |
Point of contact
| Organization | |
|---|---|
| FAO-UN - AGLL (ex-FAO Land and Water Division) | land-and-water@fao.org |
| International Institute for Applied Systems Analysis (IIASA) |
Distribution
Date
| Date |
|---|
| 2000-05-01 |
Metadata production
Language
eng