Southern Wisconsin Cheesemakers' and Dairymen's Association / Proceedings of the tenth annual meeting of the Southern Wisconsin Cheesemakers' and Dairymen's Association held at Monroe, Wisconsin, Thurs. and Fri., January 27 and 28, 1910
Readheimer, J. E.
Phosphorus as a fertilizer on the dairy farm, pp. 75-83 PDF (1.9 MB)
SOUTHERN WIS. CHEESEMAKERS' & DAIRYMEN'S ASS'N. 79 made available by the same means. \nd manure is the very best kind of organic matter to use as it readily decays in the soil. Raw rock phosphate is not only cheap, but its phosphorus content is highij. It is as rich in phosphorus as pure steamed bone meal, twice as rich as acid phosphate, costs only about a third as muclh as steamed bone meal, and only a fourth as much as acid phosphate. Phosphorus has at least three distinct actions on the crops. It has a indirect action on the grain crops in that it increases the yield of clover thus providing more humus and nitrogen in increased amounts of manure. And it exerts a beneficial action in making it possible to grow more thrifty and v igorous plants to resist the attacks of in- sect enemies and fungous diseases. It is a well known fact that insects attack the weakest plants. Much work has been done with raw rock phosphate used in connection with decaying organic matter. Probably the oldest and best known experiments have been conduct- ed by the Ohio Experiment Station, using manure as the form of decaying organic matter. A n experiment was begun in 1897 for the purpose of comparing manure that had been exposed to the weather in an open barnyard dur- ing the winter with that taken (lirectly fronm the stable to the field, an(l of studying the effect of treating the manure with reinforcing materials. Four parcels of manure were used in the exp)riments, two from the open vard, alnd two from the stables. With one parcel of each kind of manLure 40 pounds of raw rock phosphate were mixed with each ton of manure, while the other parcels remained untreat- ed. Eight tons of each kind of each kind of manure were hauled out and spread on a clover sod that was to be plant- ed to corn. This was in a three-wear crop rotation of corn, wheat, and clover. The experiment was carried on on three fields so all three crops were represented every year. As an average of 11 corn crops, 10 wheat crops and 7 hay orops the increases per acre were as follows:
Based on date of publication, this material is presumed to be in the public domain.| For information on re-use, see http://digital.library.wisc.edu/1711.dl/Copyright