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

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Apr 11, 2024 413 likes •624 views

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

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Plains Nitrogen Recommendation Plains Nitrogen Recommendation

N lbs/A = (yield * N req.) ‐ lbs of NO3‐N in 24” Legume credit ‐ Legume credit ‐ Manure credit ‐ Irrigation water credit

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Plains Nitrogen Recommendation Plains Nitrogen Recommendation

An Example An Example

Corn after Soybeans

200 b / 2 2 0 lb f i d 200 bu/A X 1.2 = 240 lbs of N required

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

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N Fertilizer Recommendation for Wheat, b / 50 bu/A

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 0 8 inches = 20 ppm NO3 N = 48 lbs of N 1. 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

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Phosphorus Recommendations General Phosphorus Recommendation Phosphorus Recommendations General Phosphorus Recommendation

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

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Importance of Phosphorus ib Tribune 2004

N+P2O5 Corn Yield N Only Corn Yield N+P2O5 Corn Yield N Only Corn Yield 0+40 97 67 8 92 40+40 148 40 92 80+40 209 80 118 120+40 228 120 103 160+40 231 160 136 160+40 231 160 136 200+40 234 200 162

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General Potassium General Potassium Recommendations

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

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Sulfur Soil Test Sulfur Soil Test

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

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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 i h lb / 8 ppm X .3 X 8 inches = 19 lbs S/A Recommendation is 3 to 9 lbs S/A

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Sulfur Recommendations lb lbs S per acre

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

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Zinc Soil (DTPA) Test and R d i Recommendations

Corrective Rate Corrective Rate Soil Test ppm Zn lb Zn/A 0 0 25 3 12 0-0.25 3-12 0.26-0.50 1-7 0 51 75 0 6 0.51-.75 0-6 0.76-1.00 0-3 1.01+ None *Annual rate: Divide Corrective Rate by 6.

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Manganese Soil Test (DTPA) and R d ti Recommendations

Mn Rate Mn Rate Mn Soil Test, ppm Rating Lbs Mn/A 0 0 5 V L 12 0-0.5 Very Low 12 0.6-1.5 Low 7-12 1.6 – 3.0 Medium 3-6 3 1 - 6 0 High 0-2 3.1 6.0 High 0 2 6.0 + Very High

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Copper Soil Test (DTPA) and R d ti Recommendations

Cu Rate** Cu Rate Cu Soil Test, ppm Rating Lbs/A 0-0 10 Very Low 3-6 0 0.10 Very Low 3 6 0.11-0.20 Low 1-2 0 21-0 30 Medium 0.21 0.30 Medium 0.31-0.60 High* 0 61+ Very High 0.61+ Very High

* Specialty crops get Copper up to 0.60 ppm
** Corrective application rate

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Boron Soil Test and Recommendations Boron Soil Test and Recommendations

Boron Rate Boron Rate Boron Soil Test, ppm Rating Lbs B/A 0 2 3 0 0 – 0.25 Low 0.5 – 3.0 0.26 – 0.50 Medium 0.0 – 1.7 0.51 + High

Alfalfa clover peanuts cotton and sugar beets require more Alfalfa, clover, peanuts, cotton and sugar beets require more boron than other crops.

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Chloride Soil Tests and Cl R d i Recommendations

Soil Test ppm Cl lbs of Cl/A Soil Test, ppm Cl lbs of Cl/A < 4 ppm Cl 20 lbs/A 6 Cl 0 lb / 4 – 6 ppm Cl 10 lbs/A > 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.

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No. 1 Environmental Enemy in

Production Agriculture

Intensive Tillage

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Carbon is a “keystone” in nutrient cycling!

C

N P K Ca Soil carbon is the “Keystone” for Mg S Zn Mn y all soil physical, chemical and biological processes and properties. Cl Bo

Management platform

fertility, variety, irrigation, species, cover crop, manure, rotations, tillage, soil type, erosion, timing,

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