一、问题的提出: 甜菜是临河的主要经济作物,约占经济作物播种面积的35—40％,每年约有8—9万亩,产量高,经济价值大,根据土壤普查情况和现有甜菜栽培水平,研究在覆膜与不覆膜的条件下,氮磷配合对甜菜块根的产量、含糖量的影响,进一步摸索甜菜施肥最适范围和最佳组合,为甜菜高产稳产低成本,优化栽培方案提供依据。1985年进行氮磷配 First, the issue put forward: beet is the main economic crops Linhe, accounting for about 35-40% of sown area of ​​economic crops, each year about 8-9 million mu, high yield, high economic value, according to soil census and the existing beet The effects of nitrogen and phosphorus on the yield and sugar content of sugarbeet root tuber were studied under the condition of mulching and non-mulching, and the optimum range and the optimum combination of sugarbeet fertilization were explored, Cultivation program to provide the basis. In 1985 for nitrogen and phosphorus