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红薯是我县重要的粮食作物。种植面积占总耕地面积17％左右,产量占全年粮食总产的15％左右,仅次于早、晚稻居第二位。在年度之间产量很不稳定,1959～1984年的26年间,年平均亩产为207.2公斤(折合稻谷下同),亩产在200公斤以下的有11年,201～249公斤的有11年,250公斤以上的有4年;高产年为261.5公斤,低产年仅146公斤,变异系数为28％。据我们多年来的试验和调查研究,红薯单产的高低在很大程度上受伏秋干旱的早、迟和轻、重所左右,干旱是红薯高产的一大障碍因子。
Sweet potato is an important grain crop in our county. The cultivated area accounts for about 17% of the total cultivated area, and the output accounts for about 15% of the total grain output of the year, second only to the second place of early rice and late rice. The annual output is very unstable. During the 26 years from 1959 to 1984, the average annual output per mu was 207.2 kilograms (equivalent to the same below for rice). Eleven years were between 200 kilograms per mu and 11 years between 201 and 249 kilos , 250 kg more than 4 years; high yield of 261.5 kg, low yield of only 146 kg, the coefficient of variation of 28%. According to our experiments and surveys over the years, the level of sweet potato yield is largely affected by the early, late and mild drought of autumn, the drought is the major obstacle to the high yield of sweet potato.