The Montgomery advertiser., 1905-07-10

phoric acid in all soils. but as A q rule, !, tha nof ammonia or potash. Then, verted or insoluble form, especially where the land is deficient in vegetable matter. This Is one reason why u s ls necessary to use 2 large c,s, per cent; fer. Q. tiiizers. There are. however, some To- caiities, usually limestone districts, where the soil contains an abundance M acid i" Phosphate has little effect This. however. can only be determined by Experimenting in the. field:
 We find phosphorie acid in nature. phate rocks. almost always In an in. n. soluble form and 1t is necessary to grind the bones or rock and treat them with suphuric acid srnn t9 tbs seRneats whcs es n1aps n9opr,ate % it. Before being treated it is called phosphate of lime. but the lease the phosphoric acid and enter into new combination with the sul- phuric acid. forming sulphate of lime or land plaster. And thus It IS that that phosphate about one-half of 1t Is sul- phate of lime. and in the other half Is held from 12 to 16 pounds Of soluble phosphoric acid ready for the plants
 Now this suiphate of lime is also of benefit to the land, especially clay land, because 1t brings about chem- icaI action which makes available some of the potash which the soil contains and which before was in an insoluble form. And this Is one reason why a fertilizer made up iargeiy oru or ,,,iie nfie potash will give such good results on
 T The sulphate of lime in the acid phosphate also attracts and holds am- inonia, which makes 1t valuable to sprinkle over compost heaps and in stables.
 most of 1t at least. soluble in water. This and small amount called revert ed phosphoric acid constitute the avail. able phosproric acid. and this IS all because 1t is all that your plants can
 The insoluble phosphoric acid will also be set down in the analysis. ana to so much bone phosphate Of lime. (usually in very large figures) which also does concern us. All you want to phSte phow %nen or ground g1d R Done. is how many pounds of available phosphoric acid 1t contains to the hundred. and this is shown in the analysis: IT 1t says wa cont. 1t means that only twelve pounds of the phosphoric acid in 100 pounds Is soluble In water. and therefore only fhlB amount l5 iCetuy lOi the plants. And If 1t reads. Avail able phosphoric acid ia per PProc cent .o,n 1t bio to make IA per cent, so that you may count on this. but that is all. all; o- per cent of phosphoric acid. about one. half of which is available: the rest will become available in time. as the bone decomposes in the soil. It is a good form for fruit trees. but not quickly enough available for field and garden crops. In dissolved bone. however, the whole amount Is immediately available.
 Bone black Is made from bone char coal, and is a big product of the sugar rcRneries. It carries a large amount of available phosphoric acid.
 There are also several other sources of phosphoric acid. including Thomas, or basic slag. tankage. fish scraps and imported phosphatic guano; but so far as the experience of the writer goes and the Information he has been able to acquire. the cheapest and best form of phosphorie acid Is in acid phosphate made from Florida. South Carolina and Tennessee phosphate rock.