咸阳耕地质量长期定位监测肥力变化初报

根据咸阳4 a耕地质量长期定位监测结果，比较分析了监测点的施肥水平、土壤养分水平以及丰缺区间样点的变化趋势，主要表现：全市监测点氮肥、磷肥施用量均为较高水平，钾肥为低水平，整体呈现南低北高。土壤有机质、全氮、速效磷、速效钾丰缺水平分别为较高、中、中、较高，呈现南高北低，南部灌区土壤全氮有隔年交替增长趋向，速效磷4个丰缺水平区间均有分布，且数据变异最大，并从提升有机物质利用率、平衡土壤养分、重视pH值方面提出合理施肥建议。

Preliminary Report on Long term Locationing and Monitoring of Fertility Change of Cultivated Land Quality in Xianyang

According to the results of long term positioning and monitoring of cultivated land quality in Xianyang for 4 years, the fertilization level, soil nutrient level and the changing trend of sample sites in the monitoring sites were compared and analyzed. The main results are as follows: the application rate of nitrogen and phosphorus fertilizer is high, potassium fertilizer is low, the whole is low in the south and high in the north.The abundance and deficiency levels of soil organic matter, total nitrogen, available phosphorus and available potassium are high, medium, medium and high, respectively, which are high in the south and low in the north.The soil total nitrogen in the southern irrigation area tends to increase alternately every other year, and the available phosphorus is distributed among the four levels of abundance and deficiency, and the data variation is the biggest.The suggestions for reasonable fertilization are put forward from the aspects of improvement of the utilization rate of organic matter, balance of the soil nutrients and attention to pH value.