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But no forest can be vigorous if the ground habitually becomes dry for a considerable period during which the weather is warm enough for growth. Desert vegetation, on the other hand, which consists primarily of bushes with small, drought-resistant leaves, needs only a few irregular and infrequent showers in order to endure long periods of heat and drought.
Perhaps the most important innovation, however, was the introduction of rice from Indo-China's kingdom Champa in 1012 into Fukien from where it soon spread. This rice had three advantages over ordinary Chinese rice: it was drought-resistant and could, therefore, be planted in areas with poor or even no irrigation. It had a great productivity, and it could be sown very early in the year.
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