Abstract
Estimation of Net Primary Production (NPP) is crucial for the supply of food/wood. Precise estimates of NPP are important for sustainable development. We used Light Use Efficiency (LUE) model to appraise various growth-related processes e.g., photosynthesis, respiration and transpiration, in the rice plant. The study site received 1213 actual sunshine hours in comparison to total possible sunshine hours which were 1595 during the complete Rice Growth Period (RGP). Water stress was estimated throughout the RGP which resulted in surplus of water in early growth stages (W=53) and deficiency in the final ripening stage with W=0.14. Careful results indicate that about 5128 kg/ha of wet biomass was generated during the complete RGP. We applied a harvest index of 0.50 to estimate the dry biomass that was 2564 kg/ha which is about (2.82 ton/ha). These estimates seem to be in exaggeration according to real time field estimates collected by Crop Reporting Service (CRS) department which were (1.83 ton/ha). To manage this exaggeration, we applied the Soil Suitability Constant (ħα) which resulted as 1.99 ton/ha in suitable zone, 1.21 ton/ha in less suitable, 1.76 ton/ha in moderately suitable and 0.73 ton/ha in not suitable zones. The average yield was estimated as 1.62 ton/ha. According to CRS department, the rice area in the study site was reported as 107000 ha and the net rice production was estimated as 1,73,340 tons in the study site. The LUE model is reliable to estimate NPP of rice crop which is useful for decision makers to determine the contribution of rice in Gross Domestic Product (GDP) at regional scales in term of surplus or shortfall.
Highlights
International Journal of Agriculture and Sustainable DevelopmentAbout half of world’s population consume rice (Oryza Stiva) as a staple food [1]
The annual rice productions seem to be insufficient in comparison to demands of increasing population [4]
Large variations in atmospheric composition are recorded over Asia [8] due to addition of a big amount of pollutants and toxic agent in our environment. These pollutants have trapped heat and caused abnormality in climatic events e.g.., we receive rainfall normally in ripening period of rice crop [9] which cause a decline to the final productivity [10]
Summary
International Journal of Agriculture and Sustainable DevelopmentAbout half of world’s population consume rice (Oryza Stiva) as a staple food [1]. Almost 90% of rice production is obtained from Asian countries [2]. Especially in low income countries [5], and the regional climate change [6,7] have put high pressure on farmers to enhance per hector yield. Large variations in atmospheric composition are recorded over Asia [8] due to addition of a big amount of pollutants and toxic agent in our environment. These pollutants have trapped heat and caused abnormality in climatic events e.g.., we receive rainfall normally in ripening period of rice crop [9] which cause a decline to the final productivity [10]. The detailed description of productivity is dependent upon these analyses
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Agriculture & Sustainable Development
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
