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近年来，一些科学家正在研制第三代肥料──物理肥料，且已进行试验的有以下6种。1．气肥。在作物发育旺盛期和成熟期，向作物喷施二氧化碳，每周喷2次，共喷5次，可使作物普遍增产（最少能增产50％，最多的可增产200％）。2．光肥。一些农作物在特定波长的光照射之后，不仅生?
In recent years, some scientists are developing the third generation of fertilizer - physical fertilizers, and have been tested in the following six kinds. 1. Gas fertilizer. During the vigorous and mature crop development, carbon dioxide is sprayed onto the crop and sprayed twice a week for 5 times to increase the yield of the crop (at least 50% of the yield and 200% of the maximum yield). 2. Light fertilizer. Some crops in a particular wavelength of light irradiation, not only students?