Abstract
The Journal of the National Science Foundation of Sri Lanka publishes the results of research in all aspects of Science and Technology. The journal also has a website at http://www.nsf.gov.lk/. 2021 Impact Factor: 0.682The JNSF provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
Highlights
The quantity of rainfall received over a period of time at any location provides a general picture on its sufficiency t o meet crop needs
Mapalana is located in the agro-ecological region lowcountry' wet zone 2 ) The mean zir temperature of the location is fairly uniform at around 28OC throughout the year
The relative humidity is usually lower in February and March (Figure 1)
Summary
The quantity of rainfall received over a period of time at any location provides a general picture on its sufficiency t o meet crop needs. In Mapalana where temperature is not generally a limiting factor, the duration of the crop season depends on rainfall. Criteria for wet month for rice would be a month with more than 200 mm of rainfall which is considered as the minimum requirement for rainfed rice.3 water requirement for dry land crops are satisfied if the monthly precipitation is at least 92 mm.
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