418 VILLE, A. — Solforazione dei frutti pomacei. 



B. Ort. Firenze. An. XII, (1887), p. 12. 



Just's Bot. Jahresber, (1888), S. 14. 



Applied a 2 per cent solution of S. of I. to young Apple and 

 Pear trees in month of June. The size of the fruit was in- 

 creased and the time of ripening hastened. 



419 VILMORIN, P. L. de.— The Manuring of Garden and 



Allotment Crops. 



Jour. Roy. Agr. Soc. England, Vol. 63 (1902), p. 142. 



420 VIRCHOW, K. — Das Kehdinger Moor und sein Land- 



wirthschaftliche Meliorirung. 



Landw. Jarhber., (1888), S. 999. 



421 VIVIEN, A., & L. GESCHWIND.— Essais sur la destruc- 



tion des Sanves. 



Engrais (1899), pp. 880-904. 



Used Mixtures of S. of I. and sodium nitrate with satisfactory 



results. 



S. of I. Nitrate of Soda Rate per Hectare 



10 Kgo. \y 2 Kgo. 10 Hkt. 



S " 3 io " 



25 " 10 " 



20 " 10 " 



422 VOELCKER, J. A. — On some Causes of Unproductive- 



ness in Soils. 



Jour. Roy. Agr. Soc. England, 2nd Ser. Vol. I, (1865), p. 113. 



Due to three causes. — 



a — Excess humic acids. 



b — Presence of small quantity of S. of I. 



c — Presence of Iron pyrites. 



"Even as small a proportion as 0.5 per cent of green vitriol ren- 

 ders a soil almost barren, and on land containing little more than 

 1 per cent nothing whatever can grow." 



423 VOELCKER, J. A.— The Destruction of Charlock. 



Jour. Roy. Agr. Soc. England. 

 3rd. Ser. Vol. 10, (1899), p. 767. 



424 VUYST, P. de. — (Field Experiments in Belgium.) 



Cultures Speciales Exper. de Borsbeke-Iez-Alost. (1893), p. 40. 



E. S. R. S, 233. 



Did not observe favorable results with S. of I. used on Peas. 



