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- W2023692645 abstract "A system has been developed to apply targeted application rates of diluted manurenitrogen onto cropland through an irrigation system by using a control valve in conjunction witha flow meter and quick test for nitrogen. With this system, a grower performs a preliminarydetermination of the nitrogen concentration in his lagoon water and estimates how long it willtake to irrigate a given acreage. Using a look-up table or computer spreadsheet, a target flowrate (gpm) is determined which will result in the application of the desired number of pounds ofnitrogen per acre. This figure is provided to the irrigator, who adjusts a valve on the pond outlet until the flow meter displays the target gpm. The number of gallons displayed on the metertotalizer is recorded at the beginning and end of each field or check and samples are takenperiodically during the irrigation and later analyzed to confirm that the N concentration in thepond did not changed over the course of the irrigation. Totalized flow and concentrationinformation is entered into a computer spreadsheet that calculates the amount of nitrogenactually applied. Any deficiency or excess (due mainly to the irrigation taking longer or slowerthan expected) can be corrected in subsequent applications irrigations. Validation of this system was conducted on ten individual irrigation basins, or checks, located inthree fields. The average area in each check was 4.6 acres. On nine of the ten irrigationchecks total nitrogen application for the season was within 15% of the intended application rateas measured by the flow meter totalizer. Average application rates for the entire field was within3% of the target rate on two fields and 17% off the target on the third field. The flow meter/valve system was installed on four cooperating dairies, and the lagoon nutrientapplications were managed by the irrigators. The system is proving to be sufficiently simple andpractical for the average dairy producer to operate, although none of the participating dairieswas able to achieve a balance of nitrogen application with uptake in the first season of use. Yields from both the replicated and all demonstration fields where lagoon water nutrients wereused exclusively were comparable to those obtained using conventional practices whichsupplement manure applications with commercial fertilizers. This method of using a flow meterand valve to apply targeted rates of lagoon nutrients is being implemented on a number ofcommercial dairies in the region. Overall considerations for designing this and other aspects of a diluted manure transport,storage and land application system are discussed." @default.
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- W2023692645 date "2001-01-01" @default.
- W2023692645 modified "2023-09-27" @default.
- W2023692645 title "Matching Dairy Lagoon Nutrient Application To Crop Nitrogen Uptake Using A Flow Meter And Control Valve" @default.
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- W2023692645 doi "https://doi.org/10.13031/2013.4197" @default.
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