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Trials were conducted to examine the effects and economic feasibility of supplemental drip irrigation on watermelon (Citrullus lanatus) production in fields with and without surface mulch consisting of a mixture of gravel and sand in the Loess Plateau of northwest China in 2001 and 2002.The trial involved four levels of drip irrigation: 0, 23, 45 and 68mm of water to both mulched and non-mulched fields...
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