For the greenhouse roses, carbon dioxide used with the water is important. Since more photosynthesis improves the growth rate of roses, more carbon dioxide is benefical. The normal amount of carbon dioxide in air is around 300 ppms. The carbon dioxide in the air could be refreshed by ventilation or burning alcohol in the green house.
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Land is so generous that it makes up for every piece of hard work. Mustafa Kemal Atatürk
