平罗县地处银川平原北部,青铜峡灌区下游,因地势平坦、地形低洼,导致地下径流不畅,地下水位高,盐碱严重。全县55.7万亩耕地中,轻、中、重盐渍区的面积占48.5％,其中重盐渍区的面积占12.7％,还有57.97万亩盐碱荒地未开垦利用。因而,防盐、保苗,充分挖掘盐碱地生产潜力是我县当前农业栽培技术措施的主要课题。地膜覆盖栽培技术在我县应用后,它不仅在一、二类农田有显著的增产增值作用,而且在三、四类农田(中、重盐碱地)也有明显的抑盐、保苗、增产效果。甜菜是我县的主要经济作物,为了探索地膜覆盖后土壤盐分动态变化规律及其对甜菜产量和含糖率的影响,为 Pingluo County is located in the northern Yinchuan Plain, Qingtongxia Irrigation District, due to flat terrain, low lying, leading to poor runoff, underground water level, salinization serious. Among the 557,000 mu of arable land in the county, 48.5% of the light, medium and heavy salinization areas account for 12.7% of the total, while 579700 mu of saline-alkali wasteland is not reclaimed and utilized. Therefore, salt, seedlings, and fully tap the potential of saline-alkali production is the county’s current agricultural cultivation techniques and measures of the main topics. After the application of plastic film mulching technology in our county, it not only has significant increment and value added effect in the first and second types of farmland, but also inhibits salt, seedling and yield increase in three or four kinds of farmland (medium and heavy saline alkali land). Beet is my county’s main cash crop, in order to explore the dynamic changes of soil salinity after mulching and its impact on sugar beet yield and yield, as