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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Nitrogen Source on Bedding Plant Growth and Water Use ProGreen EXPO – 2009
What form of N is in the bag? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ammonium vs. Nitrate ,[object Object],[object Object],[object Object]
Ammonium vs. Nitrate ,[object Object],[object Object],[object Object],[object Object]
Ammonium Toxicity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Dr. Douglas A. Cox, University of Massachusetts
Nitrate Nitrogen Uptake pH goes up NO 3 - OH -
Ammonium Nitrogen Uptake pH goes down NH 4 + H +
Ion Uptake and pH ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Common Fertilizers Fertilizer NH 4  (%) Ca (%) Mg (%) 21-7-7 100 0 0 20-20-20 69 0 0 20-10-20 40 0 0 15-5-15 22 5 2
Nitrate Nitrogen ,[object Object],[object Object],[object Object],[object Object],[object Object]
Older Fertilizers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Modern Fertilizers ,[object Object],[object Object],[object Object],[object Object],[object Object]
How does the N-source impact plant growth? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pansy, NO 3 - :NH 4 + =100:0
Pansy, NO 3 - :NH 4 + =75:25
Pansy, NO 3 - :NH 4 + =50:50
Pansy, NO 3 - :NH 4 + =25:75
Pansy, NO 3 - :NH 4 + =0:100
Petunia, NO 3 - :NH 4 + =100:0
Petunia, NO 3 - :NH 4 + =75:25
Petunia, NO 3 - :NH 4 + =50:50
Petunia, NO 3 - :NH 4 + =25:75
Petunia, NO 3 - :NH 4 + =0:100
Pansy – Plant Growth
Petunia – Plant Growth
Chlorophyll
Pansy - Evapotranspiration
Daily Evapotranspiration
Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Thanks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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N Source On Bedding Plant Growth