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)
78 TENTH ANNUAL CONVE'NTION ed. It should be well drained and well manured, and on any but limestone soil, liberal amounts of limestone should be applied. By growing clover and alfalfa to furnish the protein of the feed and by using large amounts of straw for bed- ding to absorb all of the liquid manure, sufficient nitrogen andl humus should be provided for in the manure produced on the farm to grow large crops of corn and oats. The clover and alfalfa of course get their nitrogen from the air. Enough phosphorus then can be purchased at a no- minal expense to maintain the soil in a permanently pro- ductive capacity. Phosphorus might be applied in the form of manure, but where only produce grown on the farm is used, not enough can be made. It might be applied in bone meal but this form is comparatively expensive. It might be app- lied in acid phosphate, but this form is also expensive and not very satisfactory because of the free acid which it con- tains. The only other form that could be used is the na- tural raw rock phosphate. This is very much the cheapest form, and dairy farming provides ideal conditions for its proper use. Raw rock phosphate, as its name implies, is a raw product. It is simply a raw rock ground into a very fine powler. In its natural state it is almost wholly insoluble in water. The fertilizer manufacturers treat it with strong sulfuric acid to render it soluble in the making of acid phosphate. But we have seen that this is object- ionable because of the free acid which it contains as well as because of its expensiveness. The phosphorus in the soil is in the form of rock phos- phate, and is insoluble except as the farmer makes it soluble by using large amounts of decaying organic matter, as farm manures and green manures. The phosphorus in a soil deficient in humus is in just as inert a condition as the raw rock phosphate fresh from the mines of Tennessee. If the phosphorus in the soil can be made available by de- caying organic matter, raw rock phosphate can also be
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