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(一) 黔中地区稻田海拔1100～1400水,年均温13～15℃,水稻多是单季。因水稻是喜温作物,芽期最低温籼稻为10℃,粳稻9℃,穗期最低温籼稻18℃,粳稻17℃,温度低了不利水稻生育,按黔中地区适应水稻生育期是4月中旬至10月中旬,约180天。实践证明,芽期、穗期温度低于临界限连续三天以上,均会造成烂秧和不实空秕。黔中地区4月中、下旬倒春寒低温频繁,为了防止低温烂芽烂秧,近年各地采取保温育
(A) The rice fields in central Guizhou are 1,100 to 1,400 meters above sea level, with an average annual temperature of 13 to 15 degrees Celsius. Rice is mostly single season. Because rice is a thermophilic crop, the lowest temperature indica rice at budding stage is 10 ℃, the japonica rice is 9 ℃, the lowest indica rice at heading stage is 18 ℃, and the japonica rice is 17 ℃. Mid to mid-October, about 180 days. Practice has proved that budding, spike temperature below the critical limit for more than three days, will result in rotten seedlings and false space 秕. In mid-April, mid-to-late late spring, cold temperatures are frequent in central Guizhou. In order to prevent rotting seedlings from low-temperature and rotting buds in recent years,