University of Maryland Extension

Agricultural Nutrient Management Program

Base Name: 
anmp

N Credits after Drought

Q. Many farmers suffered serious drought this year and their soybean crop is only a fraction of what they normally produce. Is it appropriate to take a nitrogen (N) credit when soybean yields are poor? What is a reasonable N credit? ( Posted November 8, 2007 ) A. The range of credits in the...

Differences in N Credits by Kill Date

Q. Several clients of mine plant oats-crimson clover or oats-hairy vetch cover crops. How much of a nitrogen credit do crop combinations warrant? ( Posted February 10, 2009 ) A. Typically the oats will winter-kill and form a vegetative mat under the crimson clover or hairy vetch. The nitrogen...

Nitrogen Credits

Differences in N Credits by Kill Date N Credits After Drought N Credits for Chilean Nitrate Soybean - Sudangrass when Harvested N Credits for Green Beans N Credits for Biosolids

Biosolids

Q. A client has asked me to develop a nutrient management plan using a local biosolid (sewage sludge) as the nutrient source. He brought me a copy of a recent analysis. I checked the Maryland Department of the Environment (MDE) Summary of Plant Available Nitrogen Calculations table and was not able...

Basis for Nutrient Management Plans

Q. Can a consultant ever recommend a nitrogen-based application of manure? A. Yes, under two circumstances: if the FIV-P is less than 150, an N-based recommendation is allowed for organic nutrient sources; if the FIV-P is greater than or equal to 150 and the P risk assessment required for the...

Differences in Plant, Manure, and Compost Among Various Laboratories

Q. I notice your web site has information about various labs that perform plant, manure, and compost analyses; however, you do not indicate how someone can convert lab data for plant tissue or manure into the form a nutrient management planner would need to develop a plan. ( Posted July 9, 2004 ) A...

Converting from Dry-Weight Basis to an As-Received Basis

Q. I'm developing a nutrient management plan using a food processing waste as a nutrient source. A note on the bottom of the lab's analytical report says the information is reported on a dry weight basis. Is it correct to enter the percent nutrient information in NuMan Pro? ( Posted May 13, 2008 )...

Converting from Parts Per Million (ppm) to Percent (%)

Q. I have a liquid manure analysis where the lab has stated the nutrient content in parts per million (ppm). How do I convert this information to percent (%) so I can enter the information correctly into NuMan Pro? ( Posted June 5, 2008 ) A. A percent is 10,000 parts per million. In order to...

Analytical Labs and Issues

Converting from parts per million (ppm) to percent (%) Converting from dry-weight basis to an as-received basis Differences in plant, manure, and compost analyses among various laboratories

Timing of Nutrient Applications

Q. I heard from a colleague that manure can be applied on hay and pasture in the fall if the annual nitrogen recommendation has not been met? (Posted May 14, 2012) A. As a matter of policy, manure may be applied in fall as the final application for the current year’s hay or pasture as long as the...

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