The figures given show the approximate losses on a 160-acre farm under the different systems of farming. With stock- and dairy-farming, as well as partly in mixed grain- and general farming, the loss of nitrogen may be avoided by growing clover. In stock- and dairy-farming, therefore, no loss of fertility will occur under these conditions when all the skim-milk is fed on the farm and a part of the grain is exchanged for more concentrated milled products, but there will on the contrary be a constant gain of fertility to the soil. (See Bull. 41, Minn. Exp. Station.) AVERAGE CHEMICAL COMPOSITION OF SOILS. (KING.) Potash. Per ct. Per ct. Per ct. Per ct. Per ct. Per ct. Per ct. .051 Clayey soils. .617 Humus soils. 35.89 3.786 Loess soils.... 68.85 .165 5.820 70.57 4.95 .729 .264 1.362 MANURIAL VALUE OF FEEDING STUFFS. Chart showing Pounds of Fertilizing Constituents of Feeding Stuffs in one Ton, and the Manurial Value of Feeding Stuffs, according to the Valuation given. |