How does this relate to agriculture?
Have you ever wondered why it helps to put black tarp under your crops during cool weather? This black tarp absorbs the heat from the day and emits it all through the night and keeps your plants from dying during a light freeze. There are also special ground coverings that can be used to absorb more sunlight and conduct the energy into the soil, which raises the soil temperature and allows quicker germination and growth of plants like tomatoes. Use of these ground covers can effectively lengthen the growing season by warming up the soil more quickly than it would on its own. In contrast, painting whitewash over greenhouse glass in summer can reflect sunlight before it gets into the greenhouse, keeping the temperatures inside cooler.