This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...Station show that the recovery for nitrogen as nitrate was 62.09 parts per hundred; for the nitrogen as ammonia, 43.26 parts per hundred; and for organic (dried blood) nitrogen, 40 parts per hundred. With the returns from nitrate, the highest recovery regarded as 100, the relative availability of the nitrogen as ammonia would be G9.7 and of nitrogen as dried blood 64.4. These figures possess a very great practical significance, as they have a direct bearing upon the economical purchase and use of the nitrogen contained in the fertilizers now offered upon the market. Commercial conditions fix the price of the various nitrogenous materials, and the cost to the farmer of any one form is not measured by Its usefulness to him, but by the cost in the market. That is, there Is no strict relationship between commercial and agricultural values. It happens that at the present time a pound of nitrogen in the form of nitrate or of ammonia costs the farmer less than a pound of organic nitrogen; that is, the nitrogen possessing the highest rate of availability as nitrate is less expensive to him than dried-blood nitrogen, or even that derived from low-grade nitrogenous materials, which do not possess any definite rate and which must, on the average, show a much lower rate of availability than dried blood, because the mixtures contain nitrogen derived from many sources, not uniform In their content of nitrogen or in their physical character or constitution. The experiment station has since its establishment consistently urged the farmers, in their purchase of fertilizers, to be guided not only by the quantities of the constituents present in the mixtures offered, but also by the kind that is used in them, pointing out the importance of...