. 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 stablemanure rendered possible the use of the cellulose as asource of energy in connection with the fixation of atmos-pheric nitrogen. Thus the introduction of stable manureinto the soil, even in small quantities, may not only aidthe decomposition of the excess of grass roots, wherebythe general tilth is improved, but it may also aid materi-ally by encouraging the growth of those organisms whichassimilate atmospheric nitrogen, quite independent
. 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 stablemanure rendered possible the use of the cellulose as asource of energy in connection with the fixation of atmos-pheric nitrogen. Thus the introduction of stable manureinto the soil, even in small quantities, may not only aidthe decomposition of the excess of grass roots, wherebythe general tilth is improved, but it may also aid materi-ally by encouraging the growth of those organisms whichassimilate atmospheric nitrogen, quite independent of thegrowth of legumes. CHAPTER VI SEA-WEEDS Under the name of sea-weeds are sometimes grouped notonly the marine algse, but occasionally other marine plants,one of the mostcommon ofwhich, on cer-tain coasts, isthe eel-grass,or grass-wrack(Zostera ma-rina), which be-longs to theNaidacse orPond-we e dfamily. The numberof marineplants whichare not algae isvery small onthe New Eng-land coast, andis said to hardlyexceed half adozen. 91. The value of sea-weed known to the ancients. —The use of sea-weed as a manure was already well known tof 65. Fig. 2. — Sea-weed for , kelp, tangle {Laminaria saccharina). 66 FERTILIZERS the early Romans, as is shown by the writings of Palla-dium, who stated that after washing with fresh water, it,with other substances, can take the place of has long been used for manurial purposes in theislands of Thanet and Jersey; also in the Hebrides, Scot-land, England, Ireland, Wales, Sweden, and elsewhere. Percentage Composition of Sea-weeds 1 Phos- Water Nitro- phoric Pot- Lime Mag- gen Acid ash nesia Ribbon-weed, kelp, or tan- gle {Laminaria saccha- Broad ribbon-weed, broad- leafed kelp, devils apron, or tangle (Lami- naria digitata) 2 Dulse, or dillisk (Rhody- menia palmata) 2 . . Round-stalked rock-weed (Ascophyllum (Fucus)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfertili, bookyear1913
