Abstract
About half of world’s population intake rice as a staple food. As being water baby, rice need surplus of water to get targeted yield. Water scarcity has become a global issue therefore it has become a need to enhance the rice yield with reduced amount of water. In this research we used ecological parameters e.g., temperature, pressure, actual vapor pressure, sunshine hours and the extraterrestrial radiation to compute net radiations, ground and sensible heat fluxes on daily basis. Net shortwave radiations were observed as 23087 w/m2 in comparison to net longwave radiations which were 4387 w/m2 for the complete Rice Growth Period (RGP). The soil heat flux Go was observed as 3104 w/m2. Go was observed dependent upon the Leaf Area Index (LAI) with inverse relationship between them. Sensible heat flux (H) was measured as 1771 w/m2 throughout the RGP. H was observed dependent upon net radiations with a direct relationship between them. Rn, Go and H were used as input parameters to compute water stress which determines the excess of water in early growth stages of rice crop and water scarcity in the ripening stage. The flow of methodology is easily applicable at domestic level to determine water stress in rice fields.
Highlights
Rice (Oriza Stiva L) has become a staple food for half of the world’s population [1]
Net shortwave radiations were observed as 23087 w/m2 in comparison to net longwave radiations which were 4387 w/m2 for the complete Rice Growth Period (RGP)
The soil heat flux Go was observed as 3104 w/m2
Summary
Rice (Oriza Stiva L) has become a staple food for half of the world’s population [1]. Global food security is largely dependent upon the supply of lowland irrigated rice [2]. Various factors are the influencing the availability of fresh water for irrigation to paddy rice crop such as the addition of industrial discharge into rivers and canals [4, 5, 6]. The contribution of Asian countries toward rice production is about 90% in global market that intakes almost 91% of total fresh water for its preparation [7]. Various techniques and methods have been suggested by many researchers to manage water demand by provision of optimized supply of water to crops to get acceptable yield [9]. All the techniques and methods were related to water saving for future. A mutual finding of these researches was the achievement of healthy yield with reduced amount of water
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