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应用养分差值法研究了作物对含稀土复混肥中Ｎ、Ｐ２Ｏ５和Ｋ２Ｏ的吸收利用情况。结果表明，以碳铵为氮源的复混肥添加适量的转型稀土，不但可增加当季作物对养肥中养分的利用，而且对下茬作物利用土壤中残留的养分也有良好的影响。
The nutrient difference method was used to study the uptake and utilization of N, P2O5 and K2O in the compound fertilizers containing rare earth. The results showed that the addition of proper amounts of transition rare earths to the compound fertilizers with ammonium bicarbonate as nitrogen source not only increased the utilization of nutrients in the fertilizers but also had a good effect on the nutrients retained in the soils under the use of the following crops.