耕地肥力是提高作物产量的基础,在正常年份情况下,地力产量要占常规产量的56%-80%。各茬作物的地力产量,一般都有3个等级,每个等级粮食产量每亩相差50公斤左右。据2004年在德化县雷峰、英山、国宝等地监测,高肥区比中肥区水稻增产6.2%,高肥区比低肥区增产11.9%,中肥区比低肥区? Cultivated land fertility is the basis for increasing crop yield. In normal years, the yield of geotechnical land accounts for 56% -80% of the conventional yield. Geomechanical yield of cropland generally has three levels, each level of grain yield per acre difference of about 50 kg. According to the monitoring of Dehua, Yingshan and Guo Bao in Dehua County in 2004, the yield of rice in the high-fat area was 6.2% higher than that of the medium-fat area, the yield of high-fat area was 11.9% higher than that of the low-fat area, and the middle-fat area was lower than the low-fat area.