195 HUBBARD, E. S.— Fertilizers and Irrigation. 



Fla. Sta. Hort Soc. (1903), p. 74. 



iron, as Sulphate of Iron, has a tonic effect on some crops mak- 

 ing the foliage look green. It may be noticed on hardpan land 

 when Sulphate fertilizers are used. 



The Irish potato will keep green longer on such spots than other 

 parts of the field but will yield poorly, evidently from lack of 

 available Phosphoric Acid, though complete fertilizers are used." 



196 HUNTER, J. J.— (Growing Roses.) 



In Griffith's "A Treatise on Manures," p. 200. 



Lincolnshires Chronicle, Nov. 16, 1886. 



Obtained good results with S. of I. on rose bushes. 



197 JENSCH, ED. — Uber die Allmahliche anreicherung des 



Bodens an Eisen bei Anwendung Kiinstlicher 

 Diingemittel. 



Chem. Ztg. XI, (1887), S. 136. 



In 600 years soil fertilized with Thomasslag meal will contain 



1 per cent ironl 



198 JOST, L. — (Iron a nutrient or stimulent?) 



Vorlesungen uber Pflanzenphysiologie, (1904), S. 104-108. 

 In general it is not difficult to differentiate between a nutrient 

 and a stimulant. In the case of iron the greatest difficulty is 

 encountered for iron behaves both as a stimulant and nutrient. 



199 JOSTING, ( ). — Die Vertilgung des Hederichs durch 



Bespritzen mit Eisenvitriollosung. 



Sachs. Landw. Ztschr. (1900), S. 174. 



Jahresber. Agr. Chem., Bd. 43, S. 352. 



A 15 per cent solution S. of I. proved sufficient, though 20 per 



cent solution did no harm to Oats. 



The younger the Charlock, the easier it is destroyed. 



200 JOULIE & DESBORDES.— Les Engrais en Horticul- 



ture. 



Two formulas recommended for trees and shrubs in general, at 

 the time of planting and during the following years : 



Qr. Lbs. 



In autumn — ■Superphosphate Lime 3 26.23 



Potassium Chloride 1 16.09 



Sulphate Ammonium 3 4.18 



In spring— Superphosphate Lime 3 26.33 



Potassium Nitrate I 22.00 



Sodium Nitrate 2 4.62 



9-11 lbs. Sulphate Iron used as soil was calcareous. 



4-6 lbs. for Jarge trees applied in 1.3 cu. yds. soil. 



12 oz. per s*q. yd. for planted trees. Surface covered by leaves. 



9 oz. per sq. yd. on groups of shrubs. Sown on surface. 



