Seasonal studies of global PAR fraction and diffuse PAR fraction and its relation with the sky coverage

• Grant number: 18/05173-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): January 01, 2019
• Effective date (End): December 31, 2019
• Field of knowledge: Agronomical Sciences - Agronomy - Agricultural Meteorology
• Principal Investigator: Alexandre Dal Pai
• Grantee: Fábio Ryu Nakasone
• Host Institution: Faculdade de Ciências Agronômicas (FCA). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil

Abstract

Photosynthesis is a process of great importance for vegetable processes. This process depends mainly on solar radiation for its operation. The radiation that plants use is the photosynthetically active (PAR), which appears in the visible spectrum. For a detailed analysis of this radiation requires theoretical knowledge of radiation and instruments for measurement. However, there is a lack of more specific data acquisition. Thus, the objective of the work is to perform a analysis of the energy values of global, diffuse PAR and diffuse PAR radiations, as well as to calculate the global PAR and diffuse PAR solar fractions in hourly, daily and monthly mean partitions. A study of the seasonality of these values as well as their dependence on their sky coverage will also be carried out. For the development of the project, will be used 4 years of data from de the Laboratory of Radiometry of Botucatu, located in the Faculty of Agronomic Sciences, UNESP Botucatu.