. Plant propagation; greenhouse and nursery practice. d several hours ina solution of some active enzyme or enzymes; the vigor of the youngplantlets was often enhanced at the same time ; within limits thesegood effects increase witli the strength of the solution; diastaseseems to be the most useful; tomato seeds seem to respond es-pecially well to diastase. 47. Chemicals, usually di-lute, or weak acids or alkalies,are sometimes used for seedswith hard, bony coats affectedneither by soaking nor freez-ing. They soften the shells sowater may enter. Vinegaraids the seeds of bramblefruits (blackber
. Plant propagation; greenhouse and nursery practice. d several hours ina solution of some active enzyme or enzymes; the vigor of the youngplantlets was often enhanced at the same time ; within limits thesegood effects increase witli the strength of the solution; diastaseseems to be the most useful; tomato seeds seem to respond es-pecially well to diastase. 47. Chemicals, usually di-lute, or weak acids or alkalies,are sometimes used for seedswith hard, bony coats affectedneither by soaking nor freez-ing. They soften the shells sowater may enter. Vinegaraids the seeds of bramblefruits (blackberry, raspberry,etc.). Sulphuric acid (com-mercial strength) is some-times used for cotton, alfalfaand clover seeds, the soakinglasting two or three to 20 min-utes (Fig. 21). Thorcuighwashing with water after thesoaking is essential,care must bediluting the acid. The acid may be poured slowlyinto the full volume cif water, but the reverse ordermust not be followed because the acid will fly. Theacid must not touch the skin or fabrics, because it G. 2t—KENTUCKY COFFEETREE SEEDLING Oreat SuIphurlc aciJ made this develop-, . ment in 40 days. exercised m 28 PLANT PROPAGATION The acid method is found in nature; for seeds of many fruits aresoftened by the acids of the fruits themselves or by those in thestomachs and intestines of birds and animals that eat the fruits(barberry, cedar, cherry, mulberry, thorn, etc.). 48. Mechanical helps are used for seeds whose coatsare too hard to be affected by any of the methods so fardescribed. Filing or boring holes in Abyssinian banana.
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectplantpropagation
