Wisconsin Dairymen's Association / Thirty-second annual report of the Wisconsin Dairymen's Association : held at Platteville, Wis., February 10, 11 and 12, 1904. Report of the proceedings, annual address of the president, and interesting essays and discussions relating to the dairy interests
Henry, W. A.
A lesson in fertility: the importance of feeding milling by-products in Wisconsin, pp. 31-41 PDF (2.3 MB)
3hiirty-second Annual Report of the is sufficient to supply the fish with all needed air and the fish's gills are arranged to take up and utilize the air in water. When the fish is thrown on the land its gills dry up and the air cannot penetrate them; the blood is poisoned for want of air and the fish dies. Strange that it should die where there is so much air, yet such is the case. Strange, too, that plants cannot get the free nitrogen of the air, yet this is likewise true. The nitrogen which plants as a rule can use must be in organized form. It must be combined with some other elementary sub- stances. Then under certain conditions the plant roots take hold of this combined nitrogen, send it in the sap currents about the plant and build it up into its tissues. Now, when the farmer or gardener feels the need of nitrogen for his lands and searches for it in the market he is obliged to pay a goodly sum for it. So precious is nitrogen in combined form that when we seek it as a fertilizer for our field or garden crops we are forced to pay about 15 cents per pound for that which is in best combination and not less than 12 cents per pound for that which is in only fairly useful form. In the rainless districts of Chili and Peru are great beds of what is known as Chili saltpeter or nitrate of soda. This material is secured in enormous quanti- ties, leached and purified and sent by the ship load to all parts of the world. Another source of nitrogen is the waste products of the slaughter houses, such as dried blood, the ground up parts of dried fish and the bones of animals, all of which fur- nish large quantities of nitrogen. Still another source of nitTo- gen is the various seeds and grains which contain small pro- portions of nitrogen but more particularly such by-products as wheat bran, gluten feed, linseed oil meal and cotton-seed meal. The next constituent of fertilizers to be considered is phos- phoric acid. The bones of farm animals contain a large amount of phosphorus. This they must get from the food supplied them, hence phosphorus is an important constituent, although in small amount, in feeding stuffs. The grains we grow are partly produced to furnish phosphorus. They get this from the soil. The soil being drawn upon for phosphorus may be- come depleted by constant cropping of the lands of that constit- uent as well as others, hence to fertilize our fields we seek 32
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