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NO3-N NITRATE NITROGEN is extracted with water and K SULFURIC ACID POTASSIUM is extracted with expressed as pPm in the soil. Soil nitrogen H2SO4 concentrated sulfuric acid which predicts levels are a guide and should be used with responses more efficiently than ammonium tissue analysis, soil profile nitrogen levels acetate. It is used when ammonium acetate K is and other information. low. Soils with less than 500 ppm K-H2SO4 are deficient. PO4-P PHOSPHATE PHOSPHORUS is extracted with 0.5 Molar sodium bicarbonate solution at pH 8.5 and Zn ZINL MANGANESEand IROexN ANDresseCOPPER are extracted expressed as ppm in the soil. Critical ranges Mn with pd as ppm in the soil. are listed below. Fe Specific critical levels for zinc are listed Cu in Crop Guide below. • Plants may be especially responsive to PO4-P fertilization when planted in cool early spring Zn Mn Fe Cu soils. ------------------ Response likely below 0.5 2.0 K POTASSIUM is extracted with 1.0 Normal ammonium Response not likely above 1.0 1.0 4.5 0.2 (AA) acetate solution at pH 7 and expressed as ppm in the soil. Critical ranges are listed below. SO4-S SULFATE SULFUR is extracted with 1 Molar lithium chloride and is expressed as ppm in the soil. Critical levels are listed below. CROP GUIDE The following guides for nutrients extracted as indicated above should be considered along with other factors. More precise critical values are available for crops grown in some areas. No critical level is listed unless correlative information supports it. PO4-P K SO4-S Zn PO4-P K SO4-S Zn - ------------------------ ----------------------- Alfalfa: Potatoes: (mineral soils) e�onse likely below 10 50 5 es't� likely below 12• 100 0.3 Response not likely above 20 80 10 Response not likely above 25 150 0.7 Barley Wheat: Rice: Response likely below 6 40 5 0.2 �onse likely below 6 60 0.5 Response not likely above 12 60 10 0.8 �Sor hhi�nn Cantaloupe: "Pone likely below 4•• 40 0.2 esp�e likely below 8 80 0.4 Response not likely above 9 60 0.5 J Response not likely above 12 100 0.6 •' Suggested PO4-P levels do not apply if Crop Corn: follows rice. Te-sponse likely below 6 50 0.3 Response not likely above 12 BO 1.0 sugar Beets: Response likely below 5• 40 0.1 Cotton: (loamy soils) Response not likely above 12 70 0.2 Te-sponse likely below 5 40 0.4 Response not likely above 9 80 1.0 Tomato: (clay soils) esll-ponce likely below 6• 50 0.3 Response likely below 5 60 0.4 Response not likely above 20 80 0.7 Response not likely above 9 100 1.0 Other field and warm season vegetables: Lettuce: (cool season) Response likely below 0.2 Response likely below 15' 50 0.5 Response not likely above 9 70 0.5 Response not likely above 25 80 1.0 (warm season) Other coal season vegetable crops: Response likely below 5 50 0.5 Response ikely belowI 0• 50 0.5 .. Response not likely above 9 80 1.0 Response not likely above 20 80 1.0 Pasture ng Ran e: esponse iy below 5 40 5 Response not likely above 20 60 10