Hay field Weed control

I have a field that is fairly new.  This year was the 4th hay season that I have done.

 

This year due to lack of rain, weeds gained strength in my field.

 

I am not the owner of the field.  The owners are very environmentally fussy about what I do.

 

I took some weeds and soil sample.  Went to the Experimental Station here in Ct.  They identified the weeds for me.  Talked to the "Weed Scientist".  He suggested this Crossbow weed killer to spray.  I would love some weed killer that I could spread. 

 

Anyone have suggestion on what to do with this type of situation?

 

Thank you.

Hay field Weed control