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We investigated the root distribution and yield of watermelon grown with a gravel–sand mulch, a plastic-film mulch, or a combination of the two mulches, and in a non-mulched control under natural precipitation and under three levels of drip irrigation (23, 45, and 68mm). Roots reached depths of 1.5m in mulched fields, but most roots (more than 85.3% in 2001 and 92.5% in 2002) in the non-irrigated...
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