Show VALUE OF prepared by the united state s department of agriculture spraying potatoes POtato ea with such auch copper sprays prays its as bordeaux pickering sprays spray si and id barium water sprays not only has tho the effect of tho the diseases for which they are ftp applied plied I 1 but according to tho the united states department of agriculture thorough and spraying usually illy greatly increases tile tho yield influences the composition of tile the tubers and increases their keeping qualities for many jnnny years ob observers eavers have reported also a stimulating effect ot of bordeaux mixture on potato foliage and a gain in yield even when no diseases were present the why and how of this effect of copper have been bean much discussed by scientists a and nd many experiments made an Inte interest mist 1119 ng contribution to this subject has abely lately been made by P F 0 cook of the he bureau of theral chemistry siry in depart bulletin 1140 1146 where evidence la Is presented to show that and aad other copper sprays increase tho the tarch and nitrogen constituents of the potato tubers and consequently make them more valuable for food und and industrial uses the bulletin contains consider considerable ablO data collected from a number of 0 stations doing experimental work with and should copper sprays on potatoes be of interest to the plant fists and bailers doing investigational work of VIN tills nature results obtained in seven states virginia maine minnesota pennsylvania new connecticut and new jersey yo york rk showed an average of 2591 pounds of solids 0 lids of the tubers per acre for the non copper sprayed VI plants fabits and sprayed plants an average for the copper increase of per cent or 48 bushels due apparently to the use of results should copper cpr sprain a y the furnish additional support to the practice of spraying potatoes es those interested may rna v secure it a copy of this bulletin te abe of charge upon from the unit ed do ipe fe quest worthing washing nent of agriculture ton D P 0 ev |