. The American florist : a weekly journal for the trade. Floriculture; Florists. C. E. Critchell. Who Succeeds the Late Max Rudolph as Presi- dent of the Cincinnati Florists' Society. marked signs of the need for phos- phorus, and experiment alone can de- termine its need. Applications of acid phosphate up to 20 pounds per 100 square feet of bench space (40 pounds per 100 cubic feet of soil), were found to give marked increases in produc- tion. The quantity of phosphorus con- tained in this application is equal to that contained in an application of 2,800 pounds of manure of average compositio
. The American florist : a weekly journal for the trade. Floriculture; Florists. C. E. Critchell. Who Succeeds the Late Max Rudolph as Presi- dent of the Cincinnati Florists' Society. marked signs of the need for phos- phorus, and experiment alone can de- termine its need. Applications of acid phosphate up to 20 pounds per 100 square feet of bench space (40 pounds per 100 cubic feet of soil), were found to give marked increases in produc- tion. The quantity of phosphorus con- tained in this application is equal to that contained in an application of 2,800 pounds of manure of average composition (.50 per cent moisture), to 100 square feet of bench space, or twice this amount mixed with 100 cu- bic feet of soil. Since manifestly it is impossible to use such a mixture. the need for phosphate in form of a commercial fertilizer is evident. Acid phosphate, the only form of phos- phatic fertilizer used in the experi- ment, is, as stated, satisfactory. Since the benefit of its use is continuous throughout the year, it should be mixed with the soil before the benches are filled. Top-dressings with it are not so satisfactory, since surface root growth is stimulated in this way, re- sulting in the roots having contact with the soil particles only in an up- per layer of the soil in the bench. There is no danger from overfeeding with acid phosphate, for four times the quantity here recommended has been applied without injury. In this respect acid phosphate possesses an advantage over bone, which cannot be mixed with soil or applied as top- dressings in excessive amounts with- out injuring the plants. The same is true to a greater extent with high phosphate tankage, and blood and bone. Use of lime.—With such a need for phosphorus by rose plants, the use of lime or limestone with acid phosphate is to be discouraged, since the solubil- ity of the phosphate would be de- creased by its use. The decrease In production from sections in which limestone was used in the soil mix- ture,
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