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Rate: 1.3 lbs. / Bu. of yield goal Timing 1/3 or less @ planting 2/3 or more @ sidedress

Nitrogen Fertility. Rate: 1.3 lbs. / Bu. of yield goal Timing 1/3 or less @ planting 2/3 or more @ sidedress Source/Application method Urea sources may volatilize on surface Inject N-sol or minimize broadcast amount Ammonium nitrate preferred for broadcast. Corn Nitrogen Uptake.

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Rate: 1.3 lbs. / Bu. of yield goal Timing 1/3 or less @ planting 2/3 or more @ sidedress

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  1. Nitrogen Fertility • Rate: 1.3 lbs. / Bu. of yield goal • Timing • 1/3 or less @ planting • 2/3 or more @ sidedress • Source/Application method • Urea sources may volatilize on surface • Inject N-sol or minimize broadcastamount • Ammonium nitrate preferred forbroadcast

  2. Corn Nitrogen Uptake % of Uptake V6 V12 Silk Milk Dent P.M

  3. Sidedress N Placement • Fibrous, lateral root system • Nitrogen is mobile in soil • Avoid root pruning Row middle is preferable

  4. Supplemental Nitrogen • Beneficial before tassel • Amount dependent on height • Corn less than 3 ft: 200 lbs/a • Corn taller than 3 ft: 100 -150 lbs/a. • Ammonium nitrate is preferred • Urea is volatile when broadcast • Foliar N = No response

  5. Starter Fertilizer Sources Poly vs Orthophosphates • 3-18-18 • ContainsK • Less corrosive • More expensive • 10-34-0 • 50% of P as ortho • More nitrogen • Less expensive No difference in field studies

  6. Corn Planting Rules • Precision is critical • Don’t plant in the mud • Minimal soil temp of 50° F • Calibrate and check in the field • Lubricate planter and seed • Plant 1 ½ - 2 inches deep • Drive slow < 5mph

  7. Yield Response to Plant Population Yield (% of max.) Plants per Acre

  8. Dryland Seeding Chart

  9. Irrigated Seeding Chart

  10. Corn Physiological Development VE V6 V12 VT/Silk Milk Dent Mature VE V6 V12 VT/Silk Milk Dent Mature Vegetative Stages Reproductive Stages Drydown May 1 June 1 July 1 Aug 1 Apr 1

  11. Corn Nutrient Requirements Don’t Guess – Soil Test!

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