Because P normally moves very slightly within the soil in the absence of erosion, corn and grain sorghum may benefit from P fertilization in a band near planted seed. Placement of fertilizer bands below and near the seed enhances the possibility of roots finding the fertilizer. Increased rooting because of the fertilizer-induced proliferation helps the crop to a more vigorous start by more efficiently using all nutrients in the rooting zone. Research with soybeans has not indicated a similar response to fertilizer placement. The difference between the grain crops and soybean response is probably best explained by the very different development of the root systems.
Most forage crops develop large numbers of small roots close to the soil surface.
These crops can use annual broadcast applications to established stands. The preferred management before seeding such crops would be to broadcast and incorporate the recommended rate. After establishment, you can annual topdress at ratesfor maximum profit and least environmental impact. Originally prepared by Dr. Kelton Anderson, former leader of Extension Agronomy. Revised by Dr. Larry Oldham, assistant specialist in Extension Plant and Soil Science.