433 WEYDEMANN, M.— Nochmals zur Hederichvertilgung 



mit Eisenvitrol. 



Deut. Landw. Presse, 1899, S. 703. 

 Jahresber. Agr. Chem. 42, S. 351. 



434 WILLIS, ( ). — The Use of Sulphate of Ammonia in 



Agriculture. 



Jour. Gas Lighting, Water Supply, etc. Vol. LV. (1890), p. 737. 



For "clover sickness" a field of clover received a dressing of three 

 hundredweight of potassium sulphate and one hundredweight 

 of ammonium sulphate applied in the early part of April. A 

 second plot received a dressing of two hundredweights of 

 S. of I. ; a third plot a dressing of one hundredweight. 



On the middle of May the disease had entirely ceased on 

 the first two pieces of land the clover growing vigorously. At 

 the end of July no sign of the disease on the second field, while 

 the third field showed the disease. 



435 WINTER, ( ).— -(Hederichvertilgung.) 



Ztschr. Landw. Kammer Schlesien, (1898). S. 721. 



436 WOODWARD, J. — Thoughts and Experiments on Vege- 



tation. 



Phil. Trans. Roy. Soc. London, Vol. 21, (1699), p. 382. 



437 WOLFF, E. V. — Verwendung von Carbolsaure oder Eis- fc 



envitriolhaltenden abtritt Diinger. 



Braunschweig. Landw. Ztg., (1884), S. 157- 



Fecal matter treated with carbolic acid or S. of I. and mixed 

 with sufficient soil may be used without danger. 



438 WOLFF, E. — Aschenanalysen von landwirthschaftlichen 



Producten. 



Berlin, (1871). 



439 WORTMANN, J.— Mit Eisenvitriol gediingte Reben. 



Ber K Lehranst Wein, Obst u. Gartenbau Geisenheim, (1895- 



96), S. 85. 



Centbl. Agr. Chem. Bd. 26, S. 429- 



Vines 12-iS years old grpwn in greenhouse showed bad result 



and this from improper application. 



