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light transmission spectra of colored hailnets from 300 to 750 nm were obtained using a laboratory spectrophotometer with a resolution better than 1 nm; photosynthetically active radiation (Par 400-700 nm)was measured in situ using a portable EGM-4 COUPLED WITH trp-1 (BOTH FROM ppsYSTEMS,Amesburry,MA,USA) at hourly intervals on aclear,sunny day in the tree periphery.
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