@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix gsp: <http://www.opengis.net/ont/geosparql#> .
@prefix locn: <http://www.w3.org/ns/locn#> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.amerigeoss.org/dataset/39fd5cd7-ebb6-4d66-a885-4f8b43fb83a6> a dcat:Dataset ;
    dct:description """<p><a href="https://snap.brc.tamus.edu/Home/Index">SNAP (Soil Nutrient Assessment Program)</a>, a component of the <a href="https://soilandwaterhub.brc.tamus.edu/Home/Index">USDA/ARS Soil and Water Hub</a>, is a web-based tool that provides an estimate of plant-available nutrients that the soil naturally provides.</p>
<p>Soil test fertilizer recommendations have long been predicated upon response curves generated from fertility trials across the country. These response curves have been compared to relative yield which provide probability ranges for a response to varying fertilizer inputs. Category responses include very low, low, adequate, high or very high inversely related to probability of a response to various inputs of nitrogen, phosphate, and potassium (N, P, and K).</p>
<p>New soil test methods, increases in computing power and access to the internet have enabled development of an interactive tool that is based on plant available NPK from both the inorganic fraction and organic pool of the soil. The new methods provide an estimate of plant available nutrients that the soil naturally provides, which has largely been ignored for decades.</p>
<p>Since we have access to large datasets we can calculate the amounts of NPK required growing crops in lbs NPK per bu of the desired crop. For example, it requires 100 lbs of N, 50 lbs P2O5, 50 lbs K2O to grow 100 bu corn. These are the base numbers from which we subtract the soil test data after converting from the analytical ppm to Lbs P2O5 or lbs K2O. This is a straight subtraction. It also eliminates the need for "calibration data" since the soil tests reflect the soils inherent fertility. Using the example above, of 100, 50, 50 of N, P, and K required and soil test results of 25, 35, 45 then the fertilizer needed would be 75 N, 15 P2O5 and 5 K2O. This is a simple approach that doesn't get lost in relative yield-crop response curves that have been used for decades from differing geographical areas.</p>
<p>This tool will include current fertilizer prices, soil test inputs, and crop based county averages for the last 15 years that will predict the chances of making the yield goal the user inputs compared to historical yield data for their county and calculate the fertilizer cost with and without soil testing compared to user input yield goal and county average. This tool will allow the user via the internet to produce a more straightforward approach to realistically planning next year's fertilizer inputs and associated cost. It will also show the benefits of soil testing for increased fertilizer efficiency and reduced environmental impact.</p>
""" ;
    dct:identifier "8acda9b1-6e4f-45c3-94d4-68ce74e97a15" ;
    dct:issued "2025-11-21T01:26:46.494476"^^xsd:dateTime ;
    dct:modified "2022-02-10"^^xsd:date ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:spatial [ a dct:Location ;
            locn:geometry "POLYGON ((-95.3931 49.3907, -122.9907 49.0463, -124.3970 47.8807, -124.7485 42.5625, -122.8149 37.5896, -119.1235 33.2953, -116.3110 32.2608, -114.5532 32.7057, -110.6860 31.2144, -108.4009 31.2144, -107.5220 31.8138, -106.6431 31.8138, -103.1274 29.0866, -102.0728 29.6992, -100.1392 28.6247, -97.6782 25.4945, -96.6235 28.1608, -94.6899 29.0866, -91.7017 29.5464, -90.1196 28.9329, -89.2407 30.0041, -86.6040 30.1562, -84.1431 29.8518, -82.3853 28.4703, -81.1548 25.6531, -80.2759 25.6531, -79.7485 26.7571, -81.3306 30.4597, -80.8032 31.6643, -75.5298 35.1843, -74.1235 39.7846, -72.7173 40.9896, -70.2563 41.7809, -70.2563 43.7169, -67.2681 44.5996, -67.4438 47.0489, -69.0259 47.5259, -70.0806 46.2039, -71.3110 45.5923, -74.4751 45.0981, -76.2329 44.2229, -78.8696 43.8438, -79.2212 42.6919, -82.7368 41.5182, -82.2095 43.3345, -83.6157 46.0821, -84.6704 46.9290, -89.7681 47.8807))"^^gsp:wktLiteral ] ;
    dct:title "SNAP - Soil Nutrient Assessment Program" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "White, Mike" ;
            vcard:hasEmail <mailto:mike.white@ars.usda.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/39fd5cd7-ebb6-4d66-a885-4f8b43fb83a6/resource/6d1bf93d-7ff9-43d4-b747-5118ec3b9ca7> ;
    dcat:keyword "amerigeo",
        "amerigeoss",
        "ckan",
        "geo",
        "geoss",
        "national",
        "north-america",
        "np211",
        "np212",
        "np215",
        "snap",
        "soil-nutrient-assessment-program",
        "united-states" .

<https://data.amerigeoss.org/dataset/39fd5cd7-ebb6-4d66-a885-4f8b43fb83a6/resource/6d1bf93d-7ff9-43d4-b747-5118ec3b9ca7> a dcat:Distribution ;
    dct:format "HTML" ;
    dct:issued "2022-03-06T09:01:27.887903"^^xsd:dateTime ;
    dct:modified "2025-11-21T01:26:46.486967"^^xsd:dateTime ;
    dct:title "Web Page" ;
    dcat:accessURL <https://snap.brc.tamus.edu/Home/Index> ;
    dcat:mediaType "text/html" .

<https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> a foaf:Agent ;
    foaf:name "US Migrating" .