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Crop Weather Calendars in India

Last modified October 05, 2004 10:23

Detailed information for each important crop on their dates of sowing, dates of commencement and duration of major cultural operations, important periods in their life cycle and their most probable weather requirements have in India been presented in a pictorial form called the “Crop Weather Calendar”.

Detailed information for each important crop on their dates of sowing, dates of commencement and duration of major cultural operations, important periods in their life cycle and their most probable weather requirements have in India been presented in a pictorial form called the “Crop Weather Calendar”. Such calendars have been prepared for each state (province) covering all the important crops grown. An example for a Wheat crop as grown in four districts of Madhya Pradesh State is shown in the <a href="fileadmin/insam/repository/das1.pdf" target="_blank">diagram</a>.
The crop weather calendars consist of three parts. At the bottom is the typical life history of the crop, from the sowing window to the period of maturity, in the form of a diagram. Important “phases” like sowing, germination & seedling, transplanting (in the case of rice), vegetative growth, flowering, grain formation and maturity may be indicated. These “phases” cover certain time intervals indicated by horizontal arrows, which depend on variations in (a) crop variety, (b) sowing date from place to place and from year to year, and (c) the nature of the crop itself. For ready reference, the months and standard weeks are marked at the bottom of the diagram.
The middle of the calendar shows the weekly normal weather as far as such conditions could be determined from long term averages.  Normal phase wise water requirements of the crop are also indicated here, determined from potential (or reference crop) evaporation multiplied by appropriate crop coefficients, together with the total water requirements over the season.
The uppermost portion of the calendar indicates the weather conditions favorable for incidence of pests and diseases and the nature of the weather warnings that can be given. Three crop development stages are represented during which these warnings for the respective weather conditions, pest and diseases are to be issued by the forecasting office concerned.
It is obvious that diagrams such as these help the weather forecaster to see, at a glance, what warnings are to be issued for a particular district during a given weather situation during a particular phase of a crop. With proper guidance as services provided by agricultural meteorologists, these calendars will also be of much interest to the agricultural profession and to the various Government Departments concerned with Agriculture and Food Production, as well as educationally to the general public. The calendars are being subjected to periodical checking and revision.
[Edited by Kees Stigter]

http://www.agrometeorology.org/fileadmin/insam/repository/das1.pdf

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