. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Joint Contribution from the Bureau of Chemistry CARL L. ALSBERG, Chief â sZr<?*<&~ri. and the Insecticide and Fungicide Board J. K. HAYWOOD, Chairman. jsyJi-'^Wu Washington, D. C. Professional Paper October 5,1918. A METHOD FOR PREPARING A COMMERCIAL GRADE OF CALCIUM ARSENATE. By J. K. Haywood, Chief, Miscellaneous Division, and Chairman, Insecticide and Fungicide Board, and C. M. Smith, Assistant Chemist. CONTENTS Page. Calcium arsenate as a substitute for lead arsenate. 1 Preparation of calcium arsenate 2 S
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Joint Contribution from the Bureau of Chemistry CARL L. ALSBERG, Chief â sZr<?*<&~ri. and the Insecticide and Fungicide Board J. K. HAYWOOD, Chairman. jsyJi-'^Wu Washington, D. C. Professional Paper October 5,1918. A METHOD FOR PREPARING A COMMERCIAL GRADE OF CALCIUM ARSENATE. By J. K. Haywood, Chief, Miscellaneous Division, and Chairman, Insecticide and Fungicide Board, and C. M. Smith, Assistant Chemist. CONTENTS Page. Calcium arsenate as a substitute for lead arsenate. 1 Preparation of calcium arsenate 2 Slaking the lime 4" Proper proportion of arsenic oxirl and lime 4 Page. Effect of dilution and temperature up- on the compound 7 Experiments with limestone 9 Summary '. 9 Labeling the product 10 CALCIUM ARSENATE AS A SUBSTITUTE FOR LEAD ARSENATE. Recently attention lias been directed to the use of calcium arsen- ate as a substitute for lead arsenate, principally because of the cheapness of lime as compared with lead oxid. While no one recom- mends the use of calcium arsenate alone on tender foliage, experi- ments by the United States Department of Agriculture1, the Cana- dian Department of Agriculture2, and others have shown that it gives excellent results on some of the more resistant plants, as well as very promising results when combined with other sprays, es- pecially sulphids, which cause to a greater or less extent the break- ing up of lead arsenate. 3 TJ. S. Dept. Agr. Bui. 278, Farmers' Bui. 908. 2 Crop Protection Leaflet Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
Size: 1706px × 1464px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
