Excerpt from The Influence of Copper Sprays on the Yield and Composition of Irish Potato Tubers In 1912 Lutman (32) published data from Vermont Showing that a greater yield of tubers was Obtained from Copper sprayed potato plants at various stages of growth than from the unsprayed plants. Plants which received a Pickering spray, a Bordeaux spray in which part of the copper sulphate had been replaced by Iron sulphate, and a commercial Spray containing copper also gave higher yields than the check plants. The increased yield seemed to be In proportion to the amount of copper present in the Spray. The application of a spray containing silver did not increase the yield. Lutman gested that the Bordeaux mixture acts as a stimulant, bringing about an increase in the quantity Of starch produced daily. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.