长期定位试验条件下土地生产力和土壤肥力的变化

为寻求适合晋西北黄土丘陵土壤特点的培肥途径，对长期不同施肥处理下土地生产力和土壤肥力的变化进行了研究。结果表明：连续施肥既能持续增产，又能提高土壤抗逆性；有机肥与氮肥合施增产效应最大，高量有机肥与氮肥合施培肥效果最好；当地应采取有机肥与氮肥配施，磷肥在有机肥不足时配合氮肥施用等施肥措施；对低肥力土壤，可采用高量有机肥与氮肥合施方案，以达到快速培肥之目的。

Changes of the Land Productivity and Soil Fertility Under Long Term Experiment

Changes of the land productivity and the soil fertility under 13 years long term experiment are studied for seeking a proper way to improve soil fertility.The experiment is located at Zhuanyaogou experimental area,a comprehensive management area of the Loess Plateau region,in Hequ county,northwestern Shanxi Province.The results show that fertilizer application can yearly increase the crop yield continually,and improve the soil resistance capability as well.The application of mixed organic fertilizer and nitrogenous fertilizer is best to increase crop yield,and the application of mixed organic fertilizer at a high quantity level and nitrogenous fertilizer is best to improve soil fertility.The main fertilization system in the area will be the application of mixed organic fertilizer and nitrogenous fertilizer,and the application of mixed phosphatic fertilizer and nitrogenous fertilizer when organic fertilizer is not adequate.For poor soils,the fertilization system will be the application of mixed organic fertilizer at a high quantity level and nitrogenous fertilizer for improving soil fertility rapidly.