. Elementary principles of agriculture; a text book for the common schools. e ground,and with equally satisfactory results. Whereit was desired to determine if, say, potas-sium was really necessary, a solution wasprepared having all the ingredients foundin the soil waters except potassium, and inthis the plants would be grown. Fig, 42shows the results of growing buckwheat ina complete or normal nutrient solution andalso when certain important elements arewithheld. It should be remembered thatsome potash, calcium, etc., was in the seedso that not aL the mineral nutrientsare kept from the plantl
. Elementary principles of agriculture; a text book for the common schools. e ground,and with equally satisfactory results. Whereit was desired to determine if, say, potas-sium was really necessary, a solution wasprepared having all the ingredients foundin the soil waters except potassium, and inthis the plants would be grown. Fig, 42shows the results of growing buckwheat ina complete or normal nutrient solution andalso when certain important elements arewithheld. It should be remembered thatsome potash, calcium, etc., was in the seedso that not aL the mineral nutrientsare kept from the plantlet. Sodium,while quite simi-lar to potassium,can not replacepotassium as anutrient. 110. Effect ofFertilizers. An-other way oftesting the effect Fig. 42. Buckwheat grown in artificial solutions of ^^ ^ SUbstaUCe mineral nutrients .4, complete solution; B, potas- :„ x^. crf/wxT +V»o slum withheld; C, nitrogen withheld; D, calcium ^^ \jO glOW tne (lime) withheld; E, without potassium, but so- rklon+cs in anma dium added. Drawn from photograph by Nobbe. pi«intb in SUUie. Relation of the Plant to the Soil 79 available soil and add the substances to the soil. This iscalled fertilizing the soil. Fig. 43 illustrates the effectof applying different fertiUzing substances to a sandysoil taken from a field in Eastern Texas. Fig. 44 showsthe effect of adding nitrogen, potassium and phosphorusto pot-cultures of alfalfa made at the Oklahoma Agri-cultural and Mechanical College.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
