. Elementary principles of agriculture : a text book for the common schools. Agriculture. 78 Elementary Principles of Agriculture cleaned and partly filled with distilled water (water cul- tures), or with pure sand (sand cultures), to which are added solutions containing the different substances supposed to be necessary for plants. These solutions are made similar in every respect to the solutions as they occur naturally in the soil. Plants have been grov/n to maturity in these artificial solutions side by side with ones just Hke them planted in the ground, and with equally satisfactory result
. Elementary principles of agriculture : a text book for the common schools. Agriculture. 78 Elementary Principles of Agriculture cleaned and partly filled with distilled water (water cul- tures), or with pure sand (sand cultures), to which are added solutions containing the different substances supposed to be necessary for plants. These solutions are made similar in every respect to the solutions as they occur naturally in the soil. Plants have been grov/n to maturity in these artificial solutions side by side with ones just Hke them planted in the ground, and with equally satisfactory results. Where it was desired to determine if, say, potas- sium was really necessary, a solution was prepared having all the ingredients found in the soil waters except potassium, and in this the plants would be grown. Fig. 42 shows the results of growing buckwheat in a complete or normal nutrient solution and also when certain important elements are withheld. It should be remembered that some potash, calcium, etc., was in the seed so that not al! the mineral nutrients are kept from the plantlet. Sodium, while quite simi- lar to potassium, can not replace potassium as a nutrient. 110. Effect of Fertilizers. An- other way of S testing the effect Fig 42 liu. kxN holt grown in artihf 111 solutions of ^^ ^ SUbstaUCC miner il nut'K nts j4, complete-olutioii i?, potas- !(, f^. arnw tViP Slum \vithhel(l C, nitrogen ^vithheld, D, c lU mm ^» ^^ s^^w tuc (lime) withheld; £?, without potassium, but so- r^lon + a in cnmA dium added. Drawn from photograph by Nobbe. pi'iUlb Ul bUUie. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ferguson, A. M. (Alexander McGowen), 1874-; Lewis, Lowery Laymon, 1869-. Chicago, Ill. : Ferguson Publishing Company
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License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
