Plains Nitrogen Recommendation Plains Nitrogen Recommendation N lbs/A - PowerPoint PPT Presentation

Plains Nitrogen Recommendation Plains Nitrogen Recommendation N lbs/A = (yield * N req.) ‐ lbs of NO 3 ‐ N in 24” ‐ Legume credit Legume credit ‐ Manure credit ‐ Irrigation water credit

Plains Nitrogen Recommendation Plains Nitrogen Recommendation An Example An Example • Corn after Soybeans 200 bu/A X 1.2 = 240 lbs of N required 200 b / 2 2 0 lb f i d • Subtract the following 1) Soil nitrate = 30 lbs of N 2) Past soybeans = 40 lbs of N 2) Past soybeans 40 lbs of N 3) Amount of N to apply = 170 lbs of N/A

N Fertilizer Recommendation for Wheat, 50 bu/A b / 1. N requirement is 2.4 lbs of N/bu (120 lbs of N) Subtract residual nitrate in 24 inches of soil – 2. 50 bushel/A wheat = 120 lbs of N required / 3. Nitrate soil tests 1 1. 0 8 inches = 20 ppm NO3 N = 48 lbs of N 0 ‐ 8 inches = 20 ppm NO3 ‐ N = 48 lbs of N 2. 8 ‐ 24 inches = 5 ppm NO3 ‐ N = 24 lbs of N 3. 120 – 48 – 24 = 48 lbs of N per acre needed p

General Phosphorus Recommendation General Phosphorus Recommendation Phosphorus Recommendations Phosphorus Recommendations Soil test ppm P Soil test ppm P Rating Rating lbs P2O5/A lbs P2O5/A 0 ‐ 5 Very Low 60 ‐ 140 6 12 6 ‐ 12 Low L 35 75 35 ‐ 75 13 ‐ 25 Medium 20 ‐ 45 26 ‐ 50 High 0 ‐ 30 51+ Very High y g None

Importance of Phosphorus Tribune 2004 ib N+P 2 O 5 Corn Yield N+P 2 O 5 Corn Yield N Only Corn Yield N Only Corn Yield 0+40 97 0 67 40+40 0 0 148 8 40 0 92 92 80+40 209 80 118 120+40 228 120 103 160+40 160+40 231 231 160 160 136 136 200+40 234 200 162

General Potassium General Potassium Recommendations Soil Test ppm K Rating lbs K2O 0 ‐ 40 0 40 Very Low Very Low 90 ‐ 200 90 200 41 ‐ 80 Low 50 ‐ 120 81 120 81 ‐ 120 Medium Medium 25 ‐ 60 25 60 121 ‐ 200 High 0 ‐ 35 201+ 201+ Very High Very High None None

Sulfur Soil Test Sulfur Soil Test Soil Test ppm S Soil Test ppm S Rating Rating 0 ‐ 3 Very Low 4 ‐ 6 6 Low 8 ‐ 12 Medium 13 ‐ 20 High 20+ 20+ Very High Very High

Sulfur Recommendation Example Sulfur Recommendation Example Wheat 80 bu/A Yield Goal Wheat 80 bu/A Yield Goal Sulfur Requirement is .28 to .35 lb S/bu Total S Required is 22 to 28 lbs/A Total S Required is 22 to 28 lbs/A Sulfate Soil Test is 8 ppm S 8 ppm X .3 X 8 inches = 19 lbs S/A i h lb / Recommendation is 3 to 9 lbs S/A

Sulfur Recommendations lb lbs S per acre Soil Sulfur Test Soil Sulfur Test 5 ppm S 7 ppm S C Corn, 200 bu/A 200 b /A 28 28 23 23 Milo, 150 bu/A 21 16 Canola, 50 bu/A 27 22 Wheat 100 bu/A Wheat, 100 bu/A 21 21 16 16 Alfalfa, 8 ton/A 25 20

Zinc Soil (DTPA) Test and Recommendations R d i Corrective Rate Corrective Rate Soil Test ppm Zn lb Zn/A 0-0.25 0 0 25 3-12 3 12 0.26-0.50 1-7 0 51 75 0.51-.75 0 6 0-6 0.76-1.00 0-3 1.01+ None *Annual rate: Divide Corrective Rate by 6.

Manganese Soil Test (DTPA) and R Recommendations d ti Mn Rate Mn Rate Mn Soil Test, ppm Rating Lbs Mn/A 0 0 5 0-0.5 V Very Low L 12 12 0.6-1.5 Low 7-12 1.6 – 3.0 Medium 3-6 3 1 - 6 0 3.1 6.0 High High 0-2 0 2 6.0 + Very High 0

Copper Soil Test (DTPA) and Recommendations R d ti Cu Rate** Cu Rate Cu Soil Test, ppm Rating Lbs/A 0 0.10 0-0 10 Very Low Very Low 3-6 3 6 0.11-0.20 Low 1-2 0.21 0.30 0 21-0 30 Medium Medium 0 0 0.31-0.60 High* 0 0.61+ 0 61+ Very High Very High 0 0 • * Specialty crops get Copper up to 0.60 ppm • ** Corrective application rate

Boron Soil Test and Recommendations Boron Soil Test and Recommendations Boron Rate Boron Rate Boron Soil Test, ppm Rating Lbs B/A 0 – 0.25 0 0 2 Low 0 0.5 – 3.0 3 0 0.26 – 0.50 Medium 0.0 – 1.7 0.51 + High 0 Alfalfa clover peanuts cotton and sugar beets require more Alfalfa, clover, peanuts, cotton and sugar beets require more boron than other crops.

Chloride Soil Tests and Cl R Recommendations d i Soil Test ppm Cl Soil Test, ppm Cl lbs of Cl/A lbs of Cl/A < 4 ppm Cl 20 lbs/A 4 – 6 ppm Cl 6 Cl 10 lbs/A 0 lb / > 6 ppm Cl 0 lbs/A KSU based on average Cl in 0 ‐ 24 inch soil root KSU based on average Cl in 0 24 inch soil root zone.

No. 1 Environmental Enemy in Production Agriculture Intensive Tillage

Carbon is a “keystone” in nutrient cycling! C N P K Ca Mg S Zn Mn Soil carbon is the “Keystone” for y all soil physical, chemical and Cl biological processes and Bo properties. Management platform fertility, variety, irrigation, species, cover crop, manure, rotations, tillage, soil type, erosion, timing,

Soil Structure Soil Structure Retention & transport of water & Retention & transport of water & nutrients Habitat for Microbes Reduced Soil Erosion d d S il i