Download or read book Progress of Irrigation Research on Willamette Valley Soils written by and published by . This book was released on 1965 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Progress of Irrigation Research on Willamette Valley Soils written by L. Boersma and published by . This book was released on 1965 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Progress of Research on Irrigation Feasibility for Dayton Amity Woodburn Willamette and Related Soils of the Willamette Valley written by L. Boersma and published by . This book was released on 1964 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Supplemental Irrigation for the Willamette Valley written by Wilbur Louis Powers and published by . This book was released on 1924 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Economic Limit of Pumping for Irrigation written by Wilbur Louis Powers and published by . This book was released on 1928 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Probable Benefits from Irrigation of Valley floor Soils in the Willamette Valley Oregon written by Alexander Joss and published by . This book was released on 1945 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The McKenzie and Muddy Creeks Irrigation Projects written by Benjamin Garrison Thompson and published by . This book was released on 1944 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Station Bulletin written by Wilbur Louis Powers and published by . This book was released on 1914 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Progress Report on Irrigation Experiments in Willamette Valley Oregon Classic Reprint written by A. P. Stover and published by Forgotten Books. This book was released on 2017-11-17 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Progress Report on Irrigation Experiments in Willamette Valley, Oregon This valley contains perhaps the largest single body of tillable land, outside of the great Sacramento and San Joaquin valleys in California, in the Pacific Coast or Rocky Mountain States. It is also one of the oldest-settled sections of the West a large part of its prairie and bottom land having been in cultivation for more than fifty years. The rainfall during the winter months is very heavy, but during the summer months it is so light as to constitute almost an arid condition in so far as the production of agricultural crops is concerned. 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 The Response of Winter Wheat to Irrigation in the Willamette Valley written by John Theodore Rossner and published by . This book was released on 1968 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some consideration has been given to the irrigation of winter wheat in the Willamette Valley of Oregon. This important crop has yielded quite well since the development and introduction of the stiff-strawed, semi-dwarf wheats, but, because of the usually dry early summers, it has been suggested that irrigation of winter wheat could probably increase the yield still further. The objective of this study was to determine the response of winter wheat to supplemental irrigation when grown under various levels of spring applied nitrogen on two important soil series. Moisture changes in the soil were followed in late spring and early summer as another phase of the study. Two winter wheat varieties were sown in October 1966 at two locations in the Willamette Valley. Each variety received supplemental nitrogen in the early spring and irrigation in late May or in June. Grain was harvested about August 1 and the yield in bushels per acre was determined. Soil moisture changes were studied at the same two locations with the use of gypsum blocks buried in the soil at different depths and at another location by soil core samples. Readings from the gypsum blocks were converted to percent moisture in the soil by a series of calculations. Based on the increase of grain yields under the various treatments, the use of nitrogen fertilizer appears to be a more practical means of increasing grain yields than does irrigation. Only a slight response to irrigation was noted. Decrease in moisture content of the soil occurred particularly in the top four feet. The largest moisture decrease occurred in the top foot, the next largest decrease was in the second foot, then the third foot, and then the fourth foot. Some moisture decrease was noted below four feet; however, the amount of decrease was small. It appears from the limited observations that soils in the Willamette Valley contain enough moisture for wheat to complete its development with little or no moisture stress.

Download or read book Progress Report on Irrigation Experiments in Willamette Valley Oregon written by Arthur P. Stover and published by . This book was released on 1908 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Irrigation Experiments and Investigations in Western Oregon written by Arthur P. Stover and published by . This book was released on 1910 with total page 72 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 The Effects of Farm and Operator Characteristics Knowledge and Attitudes on Farm level Improvements in Irrigation Efficiency in the Central Willamette Valley written by Mary Cora Stoff and published by . This book was released on 1994 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was conducted using data collected from a sample of mint and vegetable farmers in the Willamette Valley of Oregon. The study identifies the influence of demographic differences, economic factors and irrigator attitudes on irrigation efficiency. Only two of the 19 characteristics theorized to influence irrigation efficiency proved to be statistically significant in both of two models. These significant variables, crop type (CROP), soil type (SOIL) suggest that a farmer's irrigation efficiency is unaffected by personal characteristics or attitudes. According to these results, the irrigator apparently applied the water that she deemed necessary, a decision based solely on the needs of the crop and the water-holding capacity of the soil.

Download or read book Land Use Distributions and Changes in the Willamette Valley in Relation to Soil Characteristics written by John Herbert Wiens and published by . This book was released on 1977 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was undertaken in the Willamette Valley, Oregon, to document 1971 land use patterns as well as land use change in a smaller study area in the 16 years prior, and to relate these to soil characteristics. Quantification of these inter-relationships was aided by use of computer tabulation and graphic methods. Use of the data base generated and methods developed was expanded somewhat and applied to calculation and mapping of composite indices of suitabilities and limitations of soils for selected uses. Mapping of land use for 1971 and 1955 was done on color and black and white photos respectively, having a scale of about 1:62,500. To avoid creating artificial, apparent land use changes by differences in delineation and classification, mapping was done first on the higher quality 1971 color photos and then by comparison on 1955 black and white photos. Importance of various photo-interpretive factors to legend development and consistent delineation and classification became apparent and was documented. The legend utilized was, with some modification, the 1972 U.S.G.S. proposed national system for use with remote sensor data. To facilitate comparison of land use and land use change with soil survey map information, photo mapped land use information and available soil association map information was transferred to transparent mylar film over planimetric U.S.G.S. 15' topographic quadrangle sheets. This also allowed use of the square, 1000 meter Universal Transverse Mercator (UTM) grid as reference for point sampling and geo-referenced coding of land use and soil information for computer storage. Tabulation of land use classes for the entire study area for 1971 showed the largest proportion of land to be in agricultural (53.5 percent) and forest land (38 percent) use. A further 6.5 percent was in urban use. Within the selected townships of the land use change study area the proportions were different; 65.7 percent, 14.3 percent and 17.2 percent for agricultural, forest, and urban uses respectively. Analysis of changes in land use between 1955 and 1971 in the land use change study area was done by means of transition matrices; diagonal elements represent areas of land not subject to change; off diagonal elements represent components of change. In total, between 55.9 and 72.4 percent of the land in the area studied experienced no use change, the range being due to uncertainty of classification of some land on the 1955 black and white photos. Urbanization was shown to have occurred largely at the expense of agricultural land and particularly non-irrigated cropland, pasture and orchard land uses. Some conversion of forest to urban land use (0.9 percent of the area) was documented, however. The most significant agricultural use change was a net increase in irrigated land of between 5 and 8.4 percent. A net decrease in orchard land was also recorded. Land use for 1971, not unexpectedly, showed significant concentration in certain physiographic areas and in areas with particular soil characteristics. Thus for example, urban uses were found more frequently than expected on valley-floor and stream-cut terraces, and forest land uses more frequently on foothills and mountainous uplands. Irrigated cropland was somewhat concentrated on soils in sandy, coarse loamy, coarse silty and fine silty particle size classes. Urban and cropland agriculture use classes have obviously avoided steeply sloping areas. Irrigated cropland and orchard land uses have avoided soil areas with high shrink-swell potential whereas grass seed producing croplands have not. Numerous other examples could be given. In summary, Chi-square analysis on the contigency tables of land use class and physical land characteristic classes gave highly significant values (eg. for 1971 land use/physiographic areas x 2 calc = 9108.25 and x 2 tab = 137.68), and thus the null hypotheses of no association between land use classification and these physical land characteristics were rejected. Three-way tabulation of soil characteristics and physiographic area classification against 1971 and 1955 land use classification allowed analysis of land use change in relation to these physical properties. The idea of composite model soils was used to provide a framework for summary of the kinds of soils subject to smallest and largest changes in particular kinds of urban, agricultural, and forest land uses. As examples, it appeared that greatest relative increases of residential and industrial uses occurred on poorly drained, fine textured, slowly permeable soils; greatest relative losses of agricultural land occurred on soils having the highest capability for agriculture, and; greatest relative increases in irrigation cropland uses occurred on soils rated good to excellent for irrigation. Other examples and trends were observed. A method for computer calculation of composite soil suitability or limitation indices for various uses was developed. Ranked indices were compared to interpretive groupings by best subjective judgement. Class frequency correlations were found to be generally good. Indices were further mapped using a computer graphics system, GRIDS. The index calculation method interfaced with a mapping capability was shown to have potential for rapid, flexible display of various soil, land use, as well as soil and land use patterns for land use planning purposes.

Download or read book Sprinkler Irrigation in the Pacific Northwest written by Henry Herman Stippler and published by . This book was released on 1956 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pp. 1.

Download or read book Subsurface Heating and Irrigation of Soils written by E. W. R. Barlow and published by . This book was released on 1974 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: