. Bulletin. Agriculture. On Difl'erout Degrees of ivailability of Plant Nutrients. IN loo p. OF DRY MATTER : 341 Total asli. It will be seen that even with the enormous close of 20j?-5' c^ypsuni added to the soil the lime content of the leaves was not so much, increased as at the dose of 5)?q of the carbonate. It remains to be mentioned that the gypsum plants showed a darker green than the others. One exceptional case where gypsum has to be api)lied in place of the carbonate in order to avoid a depression of the harvest exists, when as the only phosphatic manure bone phospliate is at han
. Bulletin. Agriculture. On Difl'erout Degrees of ivailability of Plant Nutrients. IN loo p. OF DRY MATTER : 341 Total asli. It will be seen that even with the enormous close of 20j?-5' c^ypsuni added to the soil the lime content of the leaves was not so much, increased as at the dose of 5)?q of the carbonate. It remains to be mentioned that the gypsum plants showed a darker green than the others. One exceptional case where gypsum has to be api)lied in place of the carbonate in order to avoid a depression of the harvest exists, when as the only phosphatic manure bone phospliate is at hand for manuring .1 soil very tleficient in lime. Since calcium carbonate depresses usually the availabilit\' of acid in bone dust, the sulphate has to take here its place, which has no such effect as was proved by Kaiayaina and could be foreseen from theoretical reasons. Sometimes the state of fertility of sandy soils rather poor in lime but producing moderate harvests, is much injured by liming with slaked lime or carbonate, perhaps b)- the phosphoric acid in the soil being rendered less available. In this case also the ap[)lication of gypsum would be in order. ])Ut in such cases the ax'ailable amounts of lime and magnesia ought to be also determined, in order to tlecide whether the linu'ng was injurious c>n ac- count of creating an unfavorable ratio of CaO : MgO. Such soils might be much benefittetl not b}' increasing the lime alone, but only by a sniutltaucoiis increase of liutc and magnesia. On this point see also the remarks farther on (p. 344). On the aetion of lime and magnesia on the soil compared with the effects in the plant. Thus far the actions of lime on the soil ha\e receiwnl much more atten- tion from the agricultural chemists than those in the plant body. The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly
Size: 3312px × 754px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookleafnumber993, booksponsoruniversity, booksubjectagriculture
