52 IiKPORT OF THE DEPARTMENT OF AGRONOMY OF THE 



11§ bushels per acre. 35£ bushels per acre. 



Influence of Limestone and Natural Rock Phosphate on Soil Productivity. 



This grain was grown in southern Illinois, on land practically abandoned ten years 

 before, and then purchased by present owner for .$15 per acre. During the past ten years 

 the land has received only one application of manure, of 8 or 10 tons per acre, and limestone 

 and natural rock phosphate averaging $1.75 worth per acre per year. (At present New York 

 State prices for these materials the cost would be about $2.70 per acre.) The soil on this 

 farm is as light-colored and as deficient in organic matter as the hill-land soils of southern 

 New York. It is altogether probable that similar treatment with limestone and phosphorus 

 would give as satisfactory results on New York soils. 



(See Circular 1G8, Illinois Agricultural Experiment Station, Urbana, 111.) 



