Download or read book Weather Effects on Experimental Plot Corn Yields written by Robert F. Dale and published by . This book was released on 1964 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Weather and Technology on Corn Yields in the Corn Belt 1929 62 written by Lawrence Hugh Shaw and published by . This book was released on 1965 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weather Effects of Experimenal Plot Corn Yields written by R.F. Dale and published by . This book was released on 1964 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: The literature which has been reviewed presented overwhelming evidence for the need to consider weather in agricultural experiments. The primary purpose of this study has been to find a single atmospheric-soil moisture stress variable which is correlated with final corn yield. It is hoped that the use of this moisture stress variable will facilitate and encourage the consideration of weather with other environmental and technological factors in agricultural research and extension. The consideration of the weather will help evaluate the spatial and temperal representativeness of experimental results. Two atmospheric-moisture stress variables were found to be highly correlated with unreplicated plot corn yields from secon year corn in the 4-year rotation experiment, corn-corn-oats-meadow, at the Iowa State University Agronomy Farm, Ames, Iowa. One of the variable was the number of days on which the corn was estimated to be under no moisture stress, in the period 6 weeks before 3 weeks after date of silking. The estimation of moisture stress or no moisture stress conditions was based on the experimental relation found by Denmead and Shaw (10). OTL = f(ETFC), where OTL is the percent available soil moisture below which the corn plant loses turgor. The amount of available soil moisture at the turgor loss point depends upon the atmospheric demands or the evapotranspirations at field capacity, ETFC. The ETFC was estimated from the daily evaporation form a weather Bureau class a evaporation pan. (...).
Download or read book Relation of Weather and Its Distribution to Corn Yields written by Floyd Edward Davis and published by . This book was released on 1941 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring the Effects of Weather on Agricultural Output written by LAWRENCE H. SHAW and published by Forgotten Books. This book was released on 2018-04-24 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Measuring the Effects of Weather on Agricultural Output: Procedures for Constructing Weather Indexes When we talk about weather in agriculture, we are interested in the net influence of all meteorological and closely associated factors on output. Weather and technol ogy, therefore, are defined in their broadest sense. Weather is those conditions Of the crop-growing environment that are beyond the control of farmers; technology is the sum total Of controllable resources and how they are used. Weather indexes for corn yields and production in Iowa from 1929 to 1960 were constructed using a plot data approach. State indexes were developed by aggregating weather indexes for individual Crop Reporting districts. The weather indexes were used in adjusting for the influence of weather the State and district actual yields per harvested acre and total production of corn. Variation in the adjusted yield series is an estimate of the effect of changes in technology. The series of adjusted corn yields for Iowa, 1929-60, indicates that improved technology increased yields in two steps. Yields from 1929 to 1935 were relatively stable. Beginning around 1935, corn yields increased rapidly until the early l94o's. This was the period marked by the rapid acceptance Of hybrid seed corn. Less than 1 percent of the corn acreage in 1933 was planted with hybrid seed; the percentage increased to nearly 99 by 1942. Corn yields remained at the new level throughout the l94o's and early l95o's. Then about 1954 a second period of yield increase began. This second increase does not appear to be due to any single factor but to a combina tion of improved practices such as increased use of fertilizer and higher planting rates. 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.
Download or read book Agricultural Science Review written by and published by . This book was released on 1965 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CAED Report written by Iowa State University. Center for Agricultural and Economic Development and published by . This book was released on 1964 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weather Effects on Expected Corn and Soybean Yields written by Paul C. Westcott and published by . This book was released on 2013-08-30 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Weather during the growing season is critical for corn and soybean yields. Adjusting for weather in an analysis of historical U.S. corn and soybean yields is important for determining underlying trends and future yield expectations. Models for U.S. corn and soybean yields provide estimates of the effects of weather on yields for those crops, allowing an analysis of those effects to be used to derive weather-adjusted trend yields. The corn model also includes planting progress by the middle of May. The estimated models indicate that reductions in precipitation below its average result in larger declines in yields than the gains in yields resulting from increases in precipitation of equal magnitudes above its average. The yield models are used to track effects of high temperatures and drought on U.S. corn and soybean yields in 2012 and to provide estimates for expected 2013 yields. Further, the models provide a framework for assessing changes in expected yields due to planting progress and weather developments. Figures and tables. This is a print on demand report.
Download or read book Techniques in Measuring Joint Relationships written by Walter A. Hendricks and published by . This book was released on 1943 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CAEA Report written by Iowa State University. Center for Agricultural and Economic Development and published by . This book was released on 1962 with total page 1182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantitative Study of the Effect of Weather and Climate on Crops in the United States written by Edward Jethro Cragoe and published by . This book was released on 1915 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Temperature Rainfall and Fertilizer on Yields and Composition of Corn Plants written by Missouri-Columbia. Agricultural Experiment Station and published by . This book was released on 1957 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weather and Our Food Supply written by Iowa State University. Center for Agricultural and Economic Development and published by . This book was released on 1964 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Fertilizers Crop Rotation and Weather Conditions on the Anchorage of Corn Plants written by Nicholas Albert Pettinger and published by . This book was released on 1933 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Resources Research Catalog written by and published by . This book was released on 1966 with total page 1464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Summer Soil conserving Crops on Yields of Other Crops written by United States. Agricultural Adjustment Administration and published by . This book was released on 1936 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Technological Progress and Weather on Corn Belt Crop Yields written by C. Arden Pope and published by . This book was released on 1982 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
