. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . he interval, of considerable quantities of carbonateof lime. Under this condition less phosphoric acid prob-ably entered into combination with iron and alumina thanwould otherwise have been the case. See Fig. 22. 371. Injury from applications of superphosphate rare. —If superphosphates are applied a short time before plant-ing, there is no likelihood of their causing injury to thecrops. A striking instance of injury to oats, when ap-plied just bef
. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . he interval, of considerable quantities of carbonateof lime. Under this condition less phosphoric acid prob-ably entered into combination with iron and alumina thanwould otherwise have been the case. See Fig. 22. 371. Injury from applications of superphosphate rare. —If superphosphates are applied a short time before plant-ing, there is no likelihood of their causing injury to thecrops. A striking instance of injury to oats, when ap-plied just before seeding, was noticed upon an unlimed acidsoil at the experiment station of the Rhode Island StateCollege, in the case of double superphosphate, althoughit was not observable with any of the other superphos-phates which were used. This ill effect, however, whichwas indicated by the unhealthy appearance and blanchingof the tips of the leaves, finally disappeared within aninterval of only a few days, probably after the initialacidity had been reduced, by the soil reactions, below thecritical point for that particular plant. 224 FERTILIZERS. MANUFACTURED PHOSPHATES 225 372. Soils on which superphosphates may give poorresults. — It has been found on the acid peat soils ofGermany (Hochmoor) that the first application of acidphosphate often has little effect and that the use of dical-cium phosphate, bone, basic slag meal, or even of certainunacidulated mineral phosphates is followed by betterresults. On such soils, as well as on those which are lightand sandy and more or less acid, the use of acid phosphateis not likely to be followed by the best possible results,unless they have first been limed. 373. Superphosphates have a flocculating action onsoils. — In experiments by Sachsse and Becker 1 it wasshown that superphosphate has a greater flocculatingeffect upon clayey particles of soils than either gypsumor lime. It should therefore improve their tilth and theirability to h
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