171 HALL, A. D.— The Soil— An Introduction to the Scien- 



tific Study of the Growth of Crops. 



172 HAGLUND E. & H. VON FEILITZEN.—Om ograesets 



utrotande genom besprutning med jaernvitriol. 



Svenska Mosskulturfor. Tidskor., 18 (1904), No. 6, pp. 413-420. 

 F. S. R. 16, p. 1091. 



Preliminary experiments on moor soils showed that the spraying 

 method furnishes an effective means of checking if not killing 

 many weeds growing on such soils. 



173 "HALSTED, B. D. — Experiments on Cranberry Diseases. 



Ann. Rpt. N. J. Sta., (1890), pp. 321-453. 



E. S. R., 3, 306. 



Results undecided. 3-20 lbs. S. of I. per sq. rod killed vines. 



174 HANDTKE, .( ).— (Hederichvertilgung). 



Ztschr. Landw. Kammer Prov. Schlesien, (1898), S. 909. 

 Lupines and Serradella suffered injury. 



175 HANSEN, J. — Anbauversuche mit verschiedenen Kulturp- 



flanzen (Vertilgung des Hederich durch Ver- 

 spritzen). 



Deut. Landw. Presse, (1903), No. 1, S. 4. 



Centbl. Agr. Chem., Bd. 33, S. 69. 



A 15 per cent solution S. of I. gave very successful results. 



176 HAYWARD, A. L— Soil Test with Corn. 



Md. Exp. Sta. Fourth Ann. Rpt. (1891), p. 357. 



177 HEBERT, A. & G. TRUFFANT.— Sur l'emploi des en- 



grais en horticulture. 

 Compt. Rend. Acad. Sci. (Paris), T. 126, (1898), p. 1831. 



178 HEIDEN, E.— (Danger of Ferrous Oxide to Plant Life). 



Lehrbuch der Diingerlehre, Bd. I, S. 562. 



A soil contained 0.97 per cent ferrous oxide. The roots and 

 leaves of beets grown on the soil contained .003 per cent. Beets 

 did poorly, the average weight per beet being 15 gr. and the fol- 

 iage 12 gr. 



The soil behaved in the same manner toward Rape, Wheat and 

 Clover. 



Kraut and Kohlrabi not affected. 



Neither the Beets, nor the other plants contained an unusual 

 amount of iron oxide. 



