|
EC Nebraska | I would think that spring wheat would have similar demand curves, looking for available S and N early when mineralization isn't really happening. That's when I like the topdress applications, putting nutrients out as close to crop use as possible. It doesn't take a lot of lbs to bump the growth curve up early. But I don't grow spring wheat myself. I don't know what that might do to lodging, etc.
Your soils are quite different, with your cooler temps you must have a lot less mineralization than we do. Your OM doesn't burn off like ours likes to do. Perhaps that's why your sulfur test levels are high and stable. OM doesn't move with water like sulfates.
Cooler temps would slow down denitrification too, I would think. Have you ever noticed a rotten egg smell when your soils have been saturated for a couple weeks? My old agronomy professor said that was a sure sign your nitrogen was gone. Denitrification is anaerobic bacteria converting NO3 to N2. If they run out of NO3, they'll start converting SO4 to H2S, which give the rotten egg smell. So if you smell that, you know most of your N is gone and your starting to lose S as well.
My ramblings to your daydreams. | |
|
Phosphorus in High PH soils
