What is the percentage of photosynthetically active radiation (PAR) in the incident solar radiation ?

What is the percentage of photosynthetically active radiation (PAR) in the incident solar radiation ?
आगमनित सौर विकिरण में प्रकाश-संश्लेषण सक्रिय विकिरण  का प्रतिशत कितना होता है?

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