卢龙县从1993年开始大面积推广生物钾肥,到1995年累计推广31.5万亩,纯增效益600多万元,1995年粮食平均单产463.3公斤,总产2.5亿公斤,均创历史最好水平。 一.效益分析。生物钾肥在甘薯上应用,据试验,亩施1.5公斤生物钾肥,增产9.4—21.9％,平均为14.6％,亩增鲜薯285公斤,增值142.5元,投入产出比1:23.8,经济效益显著。1995年全县甘薯应用生物钾肥11.5万亩,增产10％以上,鲜薯亩产1996公斤,创历史最高水平。在小 Since 1993, Lulong County has popularized bio-potash fertilizer on a large scale. By 1995, it had promoted 315,000 mu of land totally and added more than 6 million yuan of pure benefits. In 1995, the average grain yield was 463.3 kilograms and the total output was 2.5 billion kilograms, both of which were the best in history . One. Benefit analysis. Bio-potash is applied on sweet potato. According to the test, 1.5 kg of bio-potash fertilizer per acre is applied, yielding 9.4-21.9% with an average of 14.6%. Acreage of 285 kg of fresh potato is increased by 142.5 yuan. The input-output ratio is 1: 23.8. . In 1995, the county’s sweet potato biological fertilizer application of 115000 acres, an increase of more than 10%, 1996 mu fresh potato yield, the highest record level. In small