The Elements of Agriculture: A Book for Young Farmers, with Questions Prepared for the Use of SchoolsD. Appleton,, 1855 - 288 Seiten |
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absorb agricultural alkali ammonia amount analysis applied ashes atmosphere become bones burning bushels carbonic acid causes CHAPTER character charcoal chemical Chlorine class of proximates clay compost compound condition consist constituents crops cultivation decay decomposed decomposition deficient deposited depth drains dung effect evaporation excrements farm farmer fertilizing gases fertilizing matters grain growth guano heap heat hydrogen important improved inches ingredients inorganic instance kinds land leached lime and salt liquid manure magnesia manganese Mapes mechanical character mineral manures mineral matter moisture mulching necessary night soil nitric acid nitrogen nure obtain organic manures organic matter Oxide of Iron oxygen particles phosphate of lime phosphoric acid plaster portions potash prepared muck prevent produce proportion pulverized rains render rocks roots of plants sand seeds silica slaked slaked lime soda soluble straw sub-soil plow substances sufficient sulphuric acid super-phosphate of lime supply surface soil tain tile tion under-draining weeds wheat
Beliebte Passagen
Seite 236 - ... of the soil — and, if it be a bulb, tuber, or tap, to assume the form requisite for its largest development. It must be evident that roots, penetrating the soil to a depth of two feet, anchor the plant with greater stability than those which are spread more thinly near the surface.
Seite 131 - It is evident that this is the case from the fact that plants have it for their direct object to make over .and put together the refuse Organic matter, and the gases and the minerals found in nature, for the use of animals. If there were no natural means of rendering the excrement of animals available to plants, the earth must soon be shorn of its fertility, as the elements of growth, when once consumed, would be essentially destroyed, and no soil could survive the exhaustion. There is no reason...
Seite 108 - ... nearly all of the matters which go to form the ashes of plants very near the surface of the soil. If such were not the case, the fertility of the earth must soon be destroyed, as all of those elements which the soil must supply to growing plants would be carried down out of the reach of roots, and leave the world a barren waste, its surface having lost its elements of fertility, while the downward nitration of these would render the water of wells and springs unfit for our use.