Common wheat are sown or transplanted in the rice water-the piece of paddy fields watered or soaked in a layer of water is not very deep, with the aim of ensuring source water for rice crops and prevent weed growth. When the crop has grown and become primarily in the rice fields, the water can drains cycle until harvested crops. The rice field irrigation water has increased productivity, though rice can grow in drier lands (such as the hillside terraces) with weed control thanks to chemical measures.
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