加拿大圭耳夫大学的土壤科学工作者Sheard利用放射性磷查明:由于条施的磷肥向旁侧移动了一英寸,因而播种15天后植物吸收的磷量甚微。他在苜蓿和雀麦分开的小区里,把一半磷肥条施在种子下面二英寸,另一半则向旁侧水平移动一英寸。播种15天后,直接生长在磷肥上的幼苗,其所含磷的一半,是来自条施磷肥 Sheard, a soil scientist at the University of Guelph, Canada, used radioactive phosphorus to identify that because of the phosphate fertilizer that was applied sideways by an inch, plants absorbed less than 15 days after sowing. In a plot of alfalfa and broccoli he used half a dozen of phosphate slurries two inches below the seed and the other half a inch horizontally to the side. After sowing for 15 days, the seedlings growing directly on the phosphate fertilizer, which contains half of the phosphorus, comes from the application of phosphate fertilizer