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秦岭南坡宁陕县高山稻区,海拔800—1200米,为一季稻区。此区山大谷峡,气温低,日照少,湿度大,水稻的延迟型冷害,障碍型冷害和混合型冷害每年都有发生,特别是早期的烂秧,后期的秋封不实,以及稻瘟病比较严重等特点,致使水稻产量低而不稳。1949—1982年34年间,全县水稻平均亩产401斤,最高年亩产509斤,最低年亩产282斤,正常年亩产300多斤。生产水平低,主要原因是科学技术落后。但应看到,全县人均水田0.3亩,“光、
Qinling Mountains Ningshan County, southern slope of mountain rice, 800-1200 meters above sea level, as a quarter of rice. This area of the Great Valley Gorge, low temperature, less sunshine, humidity, delayed chilling injury, obstacle-type chilling injury and mixed cholera occur every year, especially in early rotten seedlings, late autumn seal false, and rice blast More serious and other characteristics, resulting in low and unstable rice yield. During the 34 years from 1949 to 1982, the average output of rice in the county was 401 kg, the highest yield was 509 kg per mu, the lowest was 282 kg per mu, and the normal annual output was 300 kg. The low level of production is mainly due to backward science and technology. However, we should see that the per capita paddy field in the county is 0.3 mu,