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The effect of total solar. radiation on nutrient concentration (mean values for 11 chrysanthemum cultivars) is. summarized in Figs 2â9. The increase of radiation (in MJ m-2) caused decreased. concentration of nitrogen, phosphorus, potassium, calcium, magnesium, cuprum and. boron in chrysanthemum leaves.
Most of the world's population live in areas with insolation levels of 150-300 watts/mÂ², or 3.5-7.0 kWh/mÂ² per day. Solar radiation is absorbed by the Earth's land surface, oceans â which cover about 71% of the globe â and atmosphere. Warm air containing evaporated water from the oceans rises, causing atmospheric circulation or convection.