University of Maryland Extension

Agricultural Nutrient Management Program

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anmp

P Risk Assessments for High Tunnels

Q. Is it necessary to do a P risk assessment (PSI/PMT) for crops grown in high tunnels? The soil test FIV-P is >150 and the crops are planted in the soil; however, the high tunnel sheds the rain which eliminates potential for erosion and runoff. (Posted 11-11, revised 10-16) A. Due to the...

Determining Dominant Soil Map Unit

Q. How does one determine the dominant map unit of a field? A. Detailed directions for Using Web Soil Survey to Determine Dominant Map Units can be found on our website. A soils map and the map unit legend both provide the information. The map unit legend gives the estimated percentage of each soil...

Trickle-Applied P

Q. Many vegetable growers utilize trickle irrigation. Should trickle-applied phosphorus be treated the same as injected-banded, incorporated, or surface-applied? One school of thought is that if a surface-applied fertilizer is irrigated into the soil or is applied before a rain, it should be...

UM-PMT for P-Removal

Q. A producer has an orchardgrass hay field with a FIV-P of 79. The yield goal for this field is 6 T/A. The producer would like to apply more P2O5 than the recommended rate of 20 lbs P2O5/A. Can he do this? (Posted May 30, 2007) A. A UM-PMT is required. A phosphorus loss rating of low or medium...

Requirements for UM-PMT and PSI

Q. There are several wheat fields on a farm that have FIV-P's in the excessive range (>100) and several others where the FIV-P is in the optimum range (51-100). No P is recommended for the fields in the excessive range; however, the farmer would like to apply the same rate of P-fertilizer to all...

General UM-PMT and PSI Questions

P Risk Assessments on Pastures Requirements for UM-PMT and PSI UM-PMT for P-Removal Trickle-Applied P Determining Dominant Soil Map Unit P Risk Assessments for High Tunnels

Field Slopes

Q. Can I use the slope given in the soil survey or do I need to measure it myself? A. The slope should be measured for each field for which you are calculating a P risk assessment (PSI/PMT). The range of slopes in the soil survey may not represent what is actually occurring in a particular field. Q...

Phosphorus Site Index - FAQs

The following categories deal with the most frequently asked questions about the Phosphorus Site Index (PSI): Field Slopes General PSI Questions Soil Drainage Surface Water

Yield Goals

Q. I have a client who has pastures and he has no idea what the typical yield is of those fields. How can I obtain yield information for situations like this where the producer has no records of yield? A. Yield estimates (based on soil map units) embedded in Web Soil Survey have replaced all other...

Unusual Nutrient Sources

Q. A client of mine wants to purchase some Perdue® pelletized poultry litter to use as a nitrogen source. How do I integrate that product into a nutrient management plan? Its fertilizer guarantee is 4-2-3. ( Posted December 4, 2007 ) A. The following are preliminary data from current research...

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