{"id":2094,"date":"2021-05-06T15:04:13","date_gmt":"2021-05-06T15:04:13","guid":{"rendered":"https:\/\/agrilife.org\/texasrowcrops\/?p=2094"},"modified":"2021-05-06T15:04:13","modified_gmt":"2021-05-06T15:04:13","slug":"on-line-calculator-to-get-texas-am-soil-test-recommendations-based-on-other-labs-test-values","status":"publish","type":"post","link":"https:\/\/agrilife.org\/texasrowcrops\/2021\/05\/06\/on-line-calculator-to-get-texas-am-soil-test-recommendations-based-on-other-labs-test-values\/","title":{"rendered":"On-Line Calculator to get Texas A&M Soil Test Recommendations based on Other Labs\u2019 Test Values"},"content":{"rendered":"

Dr. Calvin Trostle, Extension Agronomy\/TAMU Dept. of Soil & Crop Sciences, Lubbock, (806) 746-6101, ctrostle@ag.tamu.edu<\/a><\/p>\n

Dr. Tony Provin, Extension Soil Testing,\/TAMU Dept. of Soil & Crop Sciences, College Station, (979) 845-4816, t-provin@tamu.edu<\/a><\/p>\n

May 4, 2021<\/p>\n

Texas farmers have many choices for laboratories conducting their soil analyses.\u00a0 If you work with a fertilizer dealer, they may collect your soil samples, pay for analysis, and draw from the information to make recommendations.\u00a0 This is fine, just know there is a possible conflict of interest (sales).\u00a0 If someone does your soil sampling for you ask for a copy of the soil test results.<\/p>\n

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There are at least five major labs in Texas that offer agricultural soil testing. Texas A&M AgriLife is one (https:\/\/soiltesting.tamu.edu<\/a>).\u00a0 You can be assured that any soil test recommendations you receive from Texas A&M AgriLife for major crops like grain sorghum or cotton are based on research in Texas soils and Texas conditions to determine nutrient response curves.\u00a0 (Many minor acreage crops will receive recommendations but based on estimates of nutrient requirements where research is absent.\u00a0 Additionally, strong collaboration exist between Texas A&M AgriLife and the cross border land grant universities who routinely compare, contrast and facilitate research supporting jointly adopted recommendations.)<\/p>\n

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For N\/P2<\/sub>O5<\/sub>\/K2<\/sub>O, i.e. nitrogen\/phosphate\/potash, Texas growers may be able to take the soil test value (not the recommendations) from another lab IF the other lab uses the \u201cMehlich-III\u201d soil extraction (in this case, for P and K) procedure.\u00a0 Ask the other lab if they use Mehlich-III by ICP and nitrate-N by cadmium reduction).\u00a0 These methods are actually the most common methods used in the United States.\u00a0 If another lab uses a different procedure from Mehlich-III (by ICP)\u00a0 then what we tell you here does not apply.\u00a0 You will get the wrong results.<\/p>\n

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If you meet the Mehlich-III and nitrate-N criteria, then access the online Texas A&M AgriLife Soil Testing Lab\u2019s calculator at https:\/\/soiltesting.tamu.edu\/recscalc\/recscalc.htm<\/a> See the figure below for what this link looks like.\u00a0 In this example, I entered data from a soil test report for a 5,000 lb.\/A grain sorghum crop.<\/p>\n

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In this example I had soil test values of:<\/p>\n

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