• Sugar beet experiment 

        Author(s):Colorado Agricultural College
        Date:1931-10-15
        Harvested sugar beets lie in 2 piles on the ground in a large field; beets on the left ("no phosphate") are considerably smaller than those on the right ("phosphate").
      • Sugar beet experiment 

        Author(s):Colorado Agricultural College
        Date:1931-10-15
        Two piles of sugar beets lie on the ground, labeled respectively "phosphate" and "no phosphate." Relative sizes of the beets shows somewhat larger sizes in the phosphate-treated beets.
      • Sugar beet experiment 

        Author(s):Colorado Agricultural College
        Date:1931-10-15
        Two men stand in a sugar beet field holding signs indicating "phosphate" or "no phosphate;" the difference in the vegetation between the treated and untreated portions of the field are obvious: treated foliage is more ...
      • Beet harvesters - farm machinery 

        Author(s):Colorado State College of Agriculture and Mechanic Arts
        Date:1936-10-15
        Beet tops on a harvested beet field.
      • Sugar beets 

        Author(s):Colorado State College of Agriculture and Mechanic Arts
        Date:1937-03-22
        A woman looking at a man as they stand on a roadway between beet fields. She has a car parked on the roadway.