Elements of agricultural chemistry, in a course of lectures for the Board of Agriculture / By Sir Humphry Davy.

  • Humphry Davy
Date:
1813
Catalogue details

Licence: Public Domain Mark

Credit: Elements of agricultural chemistry, in a course of lectures for the Board of Agriculture / By Sir Humphry Davy. Source: Wellcome Collection.

    412/428 (page 56)
    XC. Agrostis mexicana. Hort. Kew. ]. P. 150. Mexican bent grass. Nat. of S. America. Introduced, 1780, by M. G. Alexander. At the time of flowering, the produce from a black sandy soil, is lbs. per acre 8 0 oz. dr. ] 1.3f dr. J n d ■ } 304920 0 Grass, 28 oz. The produce per acre 80 dr. of grass weigh when dry 28 The produce of the space, ditto 156 The weight lost by the produce of one acre in drying 64 dr. of grass afford of nutritive matter 2 dr The produce of the space, ditto 14 dr XCI. Stipa pennata. Engl. Bot. 1356. Long-awned feather grass. Nat. of Britain. At the time of flowering, the produce from a heath soil, is Grass 14 oz. The produce per acre - 152460 0 : 80 dr. of grass weigh when dry 29 dr. The produce of the space, ditto 8 If dr. The weight lost by the produce of one acre in drying 64 dr of grass afford of nutritive matter 2.3 dr. 1 The produce of the space, ditto 9.2j J ^ or 19057 106722 0 = 6670 2 0 12387 6 0 9528 12 = 595 8 12 J 55266 12 9528 12 0 3454 2 12 6074 9 4 409 7 0 XCII. Triticum repens. Engl. Bot. 909. Creeping rooted wheat grass. Nat. of Britain. At the time of flowering, the produce from a light clayey loam, is Grass, 18 oz. The produce per acre - 196020 0 =12251 4 0 80 dr of grass weigh when dry 32 dr. 7 rp, , 8 liri ?• 78408 0 = 4900 8 I he produce ol the space, ditto 115f j The weight lost by the produce of one acre in drying - 7350 12 64 dr. of grass afford of nutritive matter 2 dr. The produce of the space, ditto 9 dr. 64 dr. of the roots, afford of nutritive matter 5.3 dr. The proportional value of the roots, is therefore to that of the grass, as 23 to 8, 6125 10 = 382 0 o 10