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Fluid Journal : Fluid Journal 1993-1995
3 Fluid Journal Fall 1994 nitrogen near streams, there's a potential for getting some in the water. But best management practices (BMPs) have been established for minimizing this potential, yet still have a sufficient amount of nutrient to get a good yield when the weather is favorable. Split applications are a good way to minimize any potential loss you'd otherwise have in the spring--- especially on sandy soils. With phosphate, it's a matter of having good residue and management practices to minimize soil erosion. That's the main avenue for loss, because phosphates are absorbed by soils. The fate of potassium and micronutrients, on the other hand, depends on what happens to the soil colloids and not so much what is leached through the soil. An exception to this is boron, which can leach through sandy soils where there's irrigation or heavy rainfall. As long as we keep our house in order with BMPs, we should minimize more regulating. FJ: We've heard rumbling about regulating lead, say, in zinc fertilizers. Anything to it? It could happen. Regulations could apply limits similar to what we've seen with sewage sludge. FJ: What does the future hold for micronutrients? Over the past 25 years we've learned where to expect micronutrient problems and we've gone a long way toward solving them. Now we're in more of a maintenance program for most crops, in terms of micronutrients. So unless we see some changes in our farming systems, we should know how to handle micronutrient problems. Dr. Mortvedt is extension soil specialist at Colorado State University. !
Fluid Journal 1996-1998