. Agricultural botany, theoretical and practical. Botany, Economic; Botany. i;o CHEMICAL COMPOSITION OF PLANTS that is needed by green plants, the necessary carbon being obtained from the carbon dioxide of the air :— Grams. Grams, Water,, • 1500 Acid potassium phosphate Calcium nitrate, . 2 (), Potassium chloride. • 4 A few drops of ferric chloride Magnesium sulphate, • i solution. For demonstration purposes buckwheat, barley, maize, small dwarf-beans, and wallflowers are easily grown. Seeds should be germinated in damp sawdust or on damp blotting-paper, and when the seedlings are large
. Agricultural botany, theoretical and practical. Botany, Economic; Botany. i;o CHEMICAL COMPOSITION OF PLANTS that is needed by green plants, the necessary carbon being obtained from the carbon dioxide of the air :— Grams. Grams, Water,, • 1500 Acid potassium phosphate Calcium nitrate, . 2 (), Potassium chloride. • 4 A few drops of ferric chloride Magnesium sulphate, • i solution. For demonstration purposes buckwheat, barley, maize, small dwarf-beans, and wallflowers are easily grown. Seeds should be germinated in damp sawdust or on damp blotting-paper, and when the seedlings are large enough to handle they should be arranged as in Fig. 82, so that their roots dip into the culture solution, their stems being allowed to develop through the hole in the cork {c). Seedlings of maize, barley and beans may be fastened in position by means of a pin pushed through the side of the pericarp or the seed-coat into the lower side of the cork ; or they may be supported by inserting cotton wool in the hole through which the stem emerges. It is important to see that only the roots dip into the solution: wetting the endosperm, cotyledons, or hypocotyl frequently leads to ill- health and death of the plant. The sides of the glass cylinder should be covered with cardboard or several thicknesses of paper to prevent access of light and heat to the solution : or the cylinder may be sunk in a box containing cocoa-nut fibre. Avoid placing the culture in the direct sun- light so that the solution in which the roots are immersed may remain cool. In experiments extending over a period of several. Fig. 82.—Water-culture of barley plant, v Cylindrical glass vessel; J culture solution : c perforated cork bung. weeks the culture solution should be changed every week, and the plant should be placed occasionally for a day or two with its roots in distilled water, or water con- taining a small amount of calcium sulphate. Ex. 97.—Fit up a water-culture as above but do not add ferri
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
