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镇坪县位于陕西省东南,巴山中部的北麓,地处北纬31°57′,耕地分布在海拔750—2000公尺地带。年雨量680—1400毫米之间。水稻生长季节“两头低温,中间热量不足。”加之阴沟冷浸田面积较大,低温造成的延迟型冷害、障碍型冷害及稻瘟病型冷害屡屡发生,水稻一般空秕率较高,所以近三十年来水稻产量常徘徊在400斤左右。根据我县气温指标,按不同海拔高度分作三个稻作带,900米以下的籼稻区,900—1200米的籼粳交错区,1200—1400米的一季早粳稻区,由于缺乏一个理想的品种,水田已几乎不存在。1978—1981年,我县先后从云南引进了“西南175—12”、“滇农—
Zhenping County is located in the southeastern part of Shaanxi Province, north of Bashan Mountain. It is located at 31 ° 57 ’north latitude and the arable land distributes at an altitude of 750-2000 meters. Annual rainfall between 680-1400 mm. Rice growth season, “the two low-temperature, the lack of heat in the middle.” Coupled with the Yinchuan cold paddy field area larger, low temperature caused by delayed chilling injury, chilling injury and cholera-type chilling injury often occur, rice generally higher vacancy rate, so nearly three Ten years of rice production often hovered around 400 pounds. According to the county’s temperature index, according to different altitudes for three rice belt, 900 meters below indica rice area, 900-1200 meters of indica-japonica crisscross area, 1200-1400 meters of a season of early rice region, due to the lack of an ideal Varieties, paddy fields have almost nonexistent. 1978-1981, our county has successively introduced from Yunnan “Southwest 175-12”, "Dian Nong -