. Fertilisers and manures. just allowed to dip into a large jar of waterin which salts of the elements found in the plant aredissolved. A complete solution might be made up asfollows:— OrmmmM p«r lilra. Calcium Nitrate 07 Potassium Phosphate 06 Potassium Chloride 08 Ma^Ticsium Sulphate 03 with a trace of ferric chloride. This will contain all the elements, except silicon,normally found in plant ashes, and under such condi-tions the plant will grow and go through its wholecycle of life, assimilating freely, producing large quanti-ties of dry matter, setting flowers, and ripening healthyseed. Ce
. Fertilisers and manures. just allowed to dip into a large jar of waterin which salts of the elements found in the plant aredissolved. A complete solution might be made up asfollows:— OrmmmM p«r lilra. Calcium Nitrate 07 Potassium Phosphate 06 Potassium Chloride 08 Ma^Ticsium Sulphate 03 with a trace of ferric chloride. This will contain all the elements, except silicon,normally found in plant ashes, and under such condi-tions the plant will grow and go through its wholecycle of life, assimilating freely, producing large quanti-ties of dry matter, setting flowers, and ripening healthyseed. Certain precautions have to be taken, but if theright conditions are assured, the growth of a plant ina water culture is perfectly normal, and may be taken,as far as the plant is concerned, as representing thecourse of its nutrition in the field. The advantage ofthe method lies in the fact that it is possible to varythe composition of the nutrient solution by omitting inturn from successive jars each of the salts used in. ^.-^^ \ThK I in; kt> OF (..;r,;c ;,i;-,. ^. No PoU»h. J. No Lime. V ? \! ? (To Am« paft 17. i] ali/:j//u.\ of the plant 17 making up the complete solution, thus obtaining mediafor the plant containing no nitrogen, no phosphorus, nopotassium, etc, the other constituents found in theplant being present in each case. The result of onesuch scries of experiments is shown in Fig. i, whichillustrates that when, e^., nitrates are omitted from theculture solution, the plant is quite unable to growafter it has used up the material in the seed, howeverfreely it may have been provided with |)tassium,magnesium, etc The net result of such experiments,in agreement with the one shown in the photograph,is that a plant must obtain by means of its rootnitrogen in combination, phosphorus, sulphur, potas-sium, ma , calcium, and a little iron—all ofwhich cci: ts are indisjx:nsable to the growthof the plant and cannot be omitted from theculture solution
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookpublishernewyorkepdutton
