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RMINING NUTRIENT AND thing in collecting a manure sample Liquid Manure Sampling LIZER NEEDS is to obtain it in a similar way to the methods used in developing the When sampling liquid manure Nitrogen Is usually selected as standard nutrient values. agitate the manure in the storage fa- priority nutrient and total crop nu- cility to obtain a representative tflents are determined by soil test WHEN TO SAMPLE MANURE sample for laboratory analysis. end Crop removal. When soil test results are high orvery high in phos- Sample manure at the time of Liquid Manure Applied with phorus or potassium it may be best land application or as close to the Spreaders to use these nutrients to determine time of application as possible. Sam- 1. Immediately after filling the tank f`the manure application rate. Also, if pling at the time of application will spreader, use a clean plastic the manure tests low in nitrogen, not provide manure recommenda- bucket to collect manure from the basing the application rate on phos- tions that can be used to adjust the unloading port or the opening phorus or potassium may be best. amount of manure applied. How- near the bottom of the tank. Be _ In any situation, manure application ever, the results can be used to ad- sure the opening does not have rate should never exceed the crop's just future manure applications and solids accumulated that can con- nitrogen requirement. to adjust the amount of inorganic fer- taminate the samples. " tilizer applied. If you apply manure Amounts of nutrients that can be several times a year, sample when 2. Stir the manure in the pail and added from manure without greatly you apply the bulk of the manure. immediately fill a one-quart flex- Increasing soil test levels are esti- ible plastic bottle about 25 per- mated on the basis of expected crop Ideally, manure sampling should cent full. Do not use a glass removal. Values in Table 1 may be be done in the field as manure is ap- bottle as it might explode from used to estimate crop removal ex- plied. This ensures that losses that pressure build up. Squeeze as pected per unit of yield for various occur during handling, storage, and much air out of the bottle as pos- crops. application are taken into account. sible before capping. ! Manure sampling, manure analy- MANURE SAMPLING 3. Put your name, date and sample I sis,and spreader calibration are part IN THE FIELD number on the bottle and the in- of a comprehensive nutrient man- formation sheet. agement plan. Manure with greater Dry or Solid Field Sampling than 20 percent solids is classified To sample manure from 4. If the sample cannot be sent to as dry manure and is handled as a barns, holding areas, dry stacks, the laboratory within a few hours, solid. Manure with 4 to 20 percent or feed lots, collect a sample as it should be refrigerated. Place solids is classified as semi-solid and follows: the sample in a plastic bag, seal can be handled as a liquid. Semi- Use the "hand and bag" the bag, and keep cool until it is solid manure usually requires thor- method to collect all solid manure sent to the laboratory. Ship so ough agitation before pumping and samples. Place a one-gallon that the sample arrives promptly sampling. Manure with less than 4 resealable freezer bag turned in- at the laboratory. percent solids is classified a liquid side out over one hand. Grab a manure and is handled with pumps, handful of manure with the cov- Liquid Manure Applied by tank wagons, and irrigation equip- ered hand and turn the freezer Irrigation Systems ment. bag right side out over the 1. Place catch pans or buckets ran sample with the free hand. Seal domly in the field to collect the A representative sample is the bag and place it in another liquid manure that is applied by needed to provide an accurate ma- freezer bag to prevent leaks. an irrigation system. nure analysis. One of the many fac- Label the bag and send to the tors affecting the nutrient content of lab or freeze it immediately to 2. Immediately after the manure has manure is how the manure is prevent nutrient losses. Take been applied,collect the manure handled and stored. Each handling three samples for dry or solid ma- from each pan or bucket and system results in different types of nure. Combine the samples and combine in one bucket to make nutrient losses. The most important mix. Place in a zip-lock bag. a composite sample.