. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . ins theexceptionally high lime content. SEA-WEEDS C7 92. Chemical composition of sea-weeds. — Most ofthe earlier analyses of sea-weed were of the ash rather thanof the entire plant. In many cases either the moisture con-tent of the originalplant was not given, orno distinction was madebetween pure and crude ash, on whichaccount it is impossibleto calculate the com-position of the plantsfrom which the ash wassecured. On this ac-count the number ofa
. Manures and fertilizers; a text-book for college students and a work of reference for all interested in the scientific aspects of modern farming . ins theexceptionally high lime content. SEA-WEEDS C7 92. Chemical composition of sea-weeds. — Most ofthe earlier analyses of sea-weed were of the ash rather thanof the entire plant. In many cases either the moisture con-tent of the originalplant was not given, orno distinction was madebetween pure and crude ash, on whichaccount it is impossibleto calculate the com-position of the plantsfrom which the ash wassecured. On this ac-count the number ofanalyses of sea-weedsin their natural condi-tion is small, a fact thatis regrettable for thereason that most of thesea-weeds used formanurial purposes, atleast in the UnitedStates, are applied tothe soil without drying,composting, or burning. The analyses on theopposite page byWheeler and Hartwellshow the composition of several different varieties, fol-lowing the rinsing off of the salt water and the removalof the superficial moisture. 93. The composition varies at different seasons. —With but few exceptions, samples of sea-weed brought up. Fig. 3. — Sea-weed for Fertilizing. Broad ribbon-weed, broad-leafed kelp, devils apron, tangle (Latninaria digitata). 68 FERTILIZERS by the tide and collected on the shore in January andMarch were found to be richer in nitrogen, potash, andphosphoric acid than those collected in September. Thismay possibly be accounted for in part by previous partialdrying in the warmer month of September, on account of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfertili, bookyear1913
