A previous paper (1) a study was made of the hygroscopicities of various fertilizer materials and of mixtures of these having common ions. The nitrogen fixation products-calcium nitrate and ammonium nitrate, as well as urea-were found among the most hygroscopic of fertilizer materials. The fertilizer salts with two elements available for plant food-potassium nitrate, monopotassium phosphate, and monoammonium phosphate-proved to be the least hygroscopic of soluble materials. The hygroscopicity of a mixture was found, in general, to be greater than that of its more hygroscopic ingredient.The present paper reports the results of a similar study of mixtures of two fertilizer salts not having a common ion. Such salts are capable, by double decomposition, of giving a second salt pair, and systems involving such salts and water are known as reciprocal salt pairs.
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