Perhaps you should try some spelling variations:
nitrogen allocation » nitrogen application (Expand search), nitrogen translocation (Expand search), nitrogen adsorption (Expand search)
decrease processes » disease processes (Expand search), defense processes (Expand search), decay processes (Expand search)
allocation problem » location problem (Expand search)
decrease decrease » decrease release (Expand search), disease decreases (Expand search), decrease sucrose (Expand search)
script nitrogen » split nitrogen (Expand search)
python script » python scrum (Expand search)
decrease std » decrease sod (Expand search), decrease and (Expand search), decrease at (Expand search)
std decrease » to decrease (Expand search), and decrease (Expand search), spp decrease (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease std decrease decrease processes ) OR ( python script nitrogen allocation problem ))~.