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How Much Potash Is Needed To Replenish An Alfalfa Stand?

Sep 17, 2010

Question: If 4 ton/acre of alfalfa is removed, how much potash is required to replenish the stand?

 Answer: Alfalfa is a big user of potassium. For every 1 ton of alfalfa, 60 lbs of K2O per acre are removed. This is equivalent to 100 lbs of potash (0-0-60). Your alfalfa yield of 4 ton/acre would need 400 lbs/acre of potash to meet crop removal rates. For alfalfa, it is recommended that the potash be applied at least two times per growing season. Ideally, apply the potash after the first and last cuttings of the season. The nutrient removal rates are book values to give us a general idea; you should also pull soil tests every two years to monitor your nutrient levels and pH. Also, keep in mind that alfalfa is highly responsive to boron as well. 
 
 
  Alfalfa Nutrient Removal Rates
Crop
Unit
P2O5
K2O
Mg
Ca
S
Alfalfa
Ton
15.0
60.0
5.0
28.0
5.0
 
 
lbs of nutrient removed per ton
 
Alfalfa Fertilizer Removal Rates
 
Yield Goal
P2O5
MAP
DAP
 
 
Alfalfa
4
60
115
130
 
 
 
 
 
 
 
 
 
 
 
K2O
Potash
 
 
 
 
 
240
400
lbs per acre for 4 ton
 
 
 
 
 
 
 

 

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