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Understanding How Soil Test Phosphorus Impacts Water Quality
https://ohioline.osu.edu/factsheet/anr-0111
Soil test P is one indicator of environmental P loss potential from a field. STP values above 100 ppm ... Tests as Risk Indicators for Leaching of Dissolved Phosphorus from Agricultural Soils in Ontario. Soil ... called eutrophication, results in depleted dissolved oxygen in water bodies. A soil test for P (STP) ...
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Wheat Planting Management Considerations for Fall 2023
than corn or soybean, and soil test levels should be maintained between 30-50 ppm (Mehlich-3 P) for ... optimum production (Table 1). Do not add phosphorus if soil test levels exceed 50 ppm. Soil potassium ... should be maintained at levels of 100-130 and 120-170 ppm (Mehlich-3 K) on sandy soils (CEC < ...
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Zinc Application to Wheat – Is it Needed?
and soils with low soil test Zn level, not wheat. Keep in mind, field crops in Ohio have a very ... soils with low organic matter could be deficient in Zn. Some studies also show that the high level of ... phosphorus may cause Zn deficiency, especially when Zn soil test levels are in low range. Crop type: Wheat is ...
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Developing Phosphorus and Potassium Recommendations for Field Crops
https://ohioline.osu.edu/factsheet/agf-0515
determined using field studies to correlate soil test levels to crop yield response. Ohio data was used to ... This framework strives to build soil test levels up to and beyond a critical level, and then maintain ... these levels over time. The critical level is a key component to this framework. Soil test levels above ...
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Phosphorus (P) Nutrient Use in Ohio
https://ohioline.osu.edu/factsheet/anr-0143
percent of Ohio counties had decreasing trends in mean soil test P (STP) levels between 1993 and 2015. ... a large degree for given soil test P (STP) values and crop production levels. In instances with the same ... reduced median soil test P (STP) levels across most Ohio counties from 1995 to 2015 supports this finding ...
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Harvest Complete? It's Time To Assess SCN Levels In Your Fields!
ideal opportunity for sampling soil and testing for SCN, allowing growers to plan ahead and implement ... By conducting fall soil tests and obtaining accurate population data before planning next year's ... Ohio Soybean Council, we are able to offer free testing for up to two soil samples per grower. The ...
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Ohio Phosphorus (P) Use by Crop Reporting District
https://ohioline.osu.edu/factsheet/anr-0144
the acreage in the Scioto River basin. Soil test P is one factor that can mitigate the amount of ... Table 2 would result in lower soil test phosphorus (STP) values over time. Evidence that this is ... levels between 1993 and 2015 (LaBarge, 2023). Future trends in STP are expected to continue to decline ...
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Calculating Cation Exchange Capacity, Base Saturation, and Calcium Saturation
https://ohioline.osu.edu/factsheet/anr-81
example of typical soil test levels in Ohio (in ppm). We can calculate the collective charge each cation ... by the soil test levels. For calcium, a soil test level of 2000 ppm, divided by 200 equals 10.0 ... (ppm) to meq/100 g soil for base and acid cations to determine CEC. Base Cation Soil test level (ppm ...
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Phosphorus Nutrient Management for Yield and Reduced P Loss at Edge of Field
https://ohioline.osu.edu/factsheet/agf-509
site and rate criteria from Assessing Nutrient Loss Risk in Ohio (NRCS) between 50 to 200 PPM. Time ... step 7. STP value of 50 PPM Mehlich III or less: CROP YIELD —Reduce risk of crop yield losses with ... available. The maintenance STP range is "critical level" to 40 PPM in corn soybean rotation and 50 ...
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Upcoming Ohio Certified Crop Adviser Pre-Exam Preparation Class
test by covering basic principles in the four competency areas – nutrient management, soil and water ... online tests. You must pass both exams to obtain Certified Crop Adviser status. Tests are offered four ... Physiology Variety Selection Soil & Water Management Soil Properties Soil Water Surface and Ground Water ...