Results of Field Experiments with Various FertilizersU.S. Government Printing Office, 1883 - 183 pages |
Common terms and phrases
24 pounds 9 inches acid and potash acre per annum Agricultural amount of nitrogen applied ashes barley Basal mixture bushels cent cereals Clay clover combined nitrogen Complete manure corn and potatoes cost cotton depth Dissolved bone Dissolved bone-black Dried blood experimental experiments with corn farm manures Favorable fertilizing materials full ration Group growth guano land leguminosa leguminous less loam maize ments Mineral fertilizers mineral manure Mixed minerals Muriate of potash Nitrate of soda nitric acid nitro Nitrogen mixture nitrogen per acre nitrogenous fertilizers oats one-third ration periments phoric acid phos phosphate plant food Plaster potash salt pounds muriate pounds of nitrogen pounds per acre pounds phosphoric acid pounds potash regulating ingredient roots samples Sandy loam season shelled corn special nitrogen experiments stable manure Stalks subsoil sulphate of ammonia sulphuric acid superphosphate surface soil tilizers trogen turnips unmanured plots wheat yard manure yield of nitrogen
Popular passages
Page 163 - Determinations of nitrogen in the soils of some of the experimental fields at Rothamsted and the bearing of the results on the question of the sources of the nitrogen of our crops.
Page 12 - The fertilizers.—The ingredients and amounts are such as are used in ordinary practice, phosphoric acid and potash being supplied in about the proportions that occur in a corn crop of fifty or sixty bushels, and nitrogen in onethird, two-thirds, and full amount in same crop.
Page 21 - ... one place fewer roots will get them, and these may be injured by coming in contact with them or with their concentrated solutions in the soil. The roots will find their way to the manure and develop more where it lies, it is true, still we should not oblige them to huddle together in one place, but should rather encourage them to spread around, where with the increased capacity the fertilizer gives them, they can get the more from the soil. Roots join with other natural agents in rendering inert...
Page 21 - Applied evenly over the plots where they belong and not allowed to get outside. 2d. Well distributed through the soil. Experiments with concentrated fertilizers are often spoiled, just as crops are injured or lost through wrong application. Farmers are apt to think the manure must be put close to the seed or the plant will not get the benefit of it This is wrong. It is not the just germinated plantlet that needs the manure, but the plant, from the time it is well started until its growth is done....
Page 159 - ... asks : Why should not the nitrogen in the juices of the plant combine with the nascent carbon and oxygen in the leaves ? He refers to the supposition of M. De Luca, that the nitrogen of the air combines with the nascent oxygen given off by the leaves of plants, and to the fact that the juice of some plants (mushrooms) has been observed to...
Page 153 - The object was to ascertain whether, among a selection of plants all belonging to the Leguminous family, but of different habits of growth, and especially of different character and range of roots, some could be grown successfully for a longer time, and would yield more produce, containing more nitrogen, as well as other constituents, than others ; all being supplied with the same descriptions and quantities of manuring substances, applied to the surface-soil.
Page 161 - After 20 years of varied and laborious investigation of the subject, M. Boussingault concluded that plants have not the power of assimilating the free nitrogen of the atmosphere. And in a letter received from him as recently as 1876, after discussing several aspects of the question, he says : — " If there is one fact perfectly demonstrated in physiology, it is this of the non-assimilation of free nitrogen by plants ; and I may add by plants of an inferior order, such as mycoderms and mushrooms.
Page 16 - The way to learn what materials are proper in a given case is by observation and experiment. The rational method for determining what ingredients of plant food a soil fails to furnish in abundance, and how these lacking materials can be most economically supplied, is to put the question to the soil with different fertilizing materials and get the reply in the crops produced.
Page 82 - ... gives them, they can get the more from the soil. Roots join with other natural agents in rendering inert stores of plant food available. " Above all, do not let the fertilizers come too close to the seed. A coarse, dilute material like yard manure may do the plants no harm, but such concentrated fertilizers as potash salts, nitrate of soda, dried blood, or high-grade superphosphates may kill them.