Lectures to Sugar Planters (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...equal to about 50 pounds phosphate of lime, an amount furnished by about 140 pounds of good commercial superphosphate. If your soil is deficient in carbonate of lime, then you must use an available but not acid form of phosphate such as is found in basic slag phosphate, precipitated phosphate, and high grade raw Peruvian guano (the latter, however, contains nitrogen); in this case you must double the amount and the cost of the phosphoric acid application. I may mention in passing that, when the amount of phosphoric anhydride is stated, by multiplying it by 2-18 you find the corresponding amount of (tricalcic) phosphate of lime; this is useful to remember as both terms frequently occur in records of analyses of manures. Now, gentlemen, you will probably be ready with this question, "We usually apply our manures in a ready mixed condition. What must be the composition of this manure to carry out your recommendations?" The following supplies the answer: --Multiply the percentage of any constituent by 22-4 and the result will be the number of pounds of that constituent in a ton of manure. An early cane manure, consisting of a mixture of dissolved Peruvian guano and sulphate of potash, or consisting of a mixture of sulphate of ammonia, superphosphate, and sulphate of potash, containing by analysis 4 per cent. nitrogen, 18 per cent. soluble phosphate of lime, 18 per cent. potash, and applied at the rate of one ton to nine acres, will approximately supply 10 pounds nitrogen, 45 pounds soluble phosphate of lime, and 45 pounds of potash. This practically realises the applications above recommended for the young plant-canes, and would be followed in June to August by the applications of sulphate of ammonia or nitrate of soda. This manure should be applied in...