Excerpt from Effects of Soil Fumigation on Production of Conifer Nursery Stock at Two Northern Rocky Mountain NurseriesThe effects of fumigation on weed control have been evaluated by periodic sample counts of weeds on three or four randomly selected l-square-foot plots during the first growing season and the early part of the second. Weed counts were followed by hand weeding. When possible, time studies of hand weedings were conducted to relate labor cost to weed density. Greenhouse germination of weeds from soil samples taken at various soil depths provided information on the residual weed - seed population and its control by fumigation. Experimental design and statistical analyses were obtained by standard randomized block layouts and analysis of variance, by paired-sample t - test procedures, or by regression analysis.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.