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Author: Southern Forest Experiment Station Publisher: Forgotten Books ISBN: 9780265827970 Category : Technology & Engineering Languages : en Pages : 58
Book Description
Excerpt from Soil-Moisture Measurement With the Fiberglas Instrument Each of these units Operates on the principle that resistance to the passage of an electrical current through the unit will depend on its moisture content. Buried in the soil, the porous material of the unit wets and dries along with the soil around it, and the changes in moisture content affect the electrical conductivity of the unit. Wires lead from the unit to the surface of the ground, where the resistance of the unit is read with a meter. To convert resistance readings to soil moisture values requires calibration of the units in the soil being studied. 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.
Author: Southern Forest Experiment Station Publisher: Forgotten Books ISBN: 9781527794535 Category : Technology & Engineering Languages : en Pages : 60
Book Description
Excerpt from Soil-Moisture Measurement With the Fiberglas Instrument Each of these units Operates on the principle that resistance to the passage of an electrical current through the unit will depend on its moisture content. Buried in the soil, the porous material of the unit wets and dries along with the soil around it, and the changes in moisture content affect the electrical conductivity of the unit. Wires lead from the unit to the surface of the ground, where the resistance of the unit is read with a meter. To convert resistance readings to soil moisture values requires calibration of the units in the soil being studied. 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.
Author: Howard W. Lull Publisher: Forgotten Books ISBN: 9780364422281 Category : Technology & Engineering Languages : en Pages : 64
Book Description
Excerpt from Soil-Moisture Measurement As has been noted, the gravimetric method is the only commonly used direct means of measuring soil moisture. Simply, it involves taking a soil sample, weighing it, oven-drying it, reweighing, and expressing the original moisture content in percent of oven-dry weight of soil. The first step, securing the sample, is the most troublesome, the degree of difficulty depending on the condition of the soil. Sampling conditions are ideal when soil is just moist enough for easy ingress and egress of the sampling instrument, and where stones, roots, and organic matter are not a problem. Such conditions are seldom encountered. With free water in the soil, moisture can never be sampled accurately: water will drip off as the sample is removed from the ground or compaction may squeeze it out. Rapid sampling is essential to prevent undue losses. Stickiness, often a problem in wet soils, can be alleviated by keeping instruments clean. Where a wet layer overlies a dry one, samples taken from the drier levels may be contaminated. After the upper soil is wetted by a summer rain, for instance, removal of a sample may permit water to run down the hole toward drier soil. The same problem is en countered when samples are taken below a perched water table. Wet instruments add to contamination and should be dried between samplings. When the soil is dry and hard, the principal problem in fine textured soils is to get the sampling instrument in and out again. In coarse-textured soils particularly, samples may slide out of the in strument as it is withdrawn from the soil. Fortunately, after the soil dries in summer, its moisture content may fluctuate so little that frequent sampling may be unnecessary. 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.
Author: United States Department Of Agriculture Publisher: Forgotten Books ISBN: 9781528016018 Category : Technology & Engineering Languages : en Pages : 58
Book Description
Excerpt from Some Field, Laboratory, and Office Procedures for Soil-Moisture Measurement: July 1954 One of the important phases of the soil-moisture studies Of the Vicksburg Infiltration Project has been the determination of bulk density. Defined as the ratio of the weight Of oven-dry soil to the volume it occupied in the field, bulk density is expressed in grams per cubic centi meter. Its use is principally for converting moisture content from percent by weight to depth or area-inches. 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.
Author: Cornelius H. M. van Bavel Publisher: Forgotten Books ISBN: 9781390250008 Category : Technology & Engineering Languages : en Pages : 44
Book Description
Excerpt from Soil Moisture Measurement With the Neutron Method Millicurie A quantity unit of radioactive material equivalent to 3. 7 x 107 disintegrations per second. Milliroentgen A unit of ionizing radiative energy; one thousandth of a roentgen. 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.
Author: Edgar Buckingham Publisher: Forgotten Books ISBN: 9780265825051 Category : Languages : en Pages : 64
Book Description
Excerpt from Studies on the Movement of Soil Moisture It is clearly recognized that the analogy is imperfect in that the capillary potential and resistance to flow are dependent upon the moisture content of the soil, whereas electrical and thermal resistance are practically independent of the amount of current and heat passmg. Nevertheless this point of view and method of attacking the problem promise to become very helpful, and are believed to be a distinct advance In the treatment of a subject which has hitherto suffered on account of serio'us experimental difficulties and the lack of a coherent guiding theory. 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.
Author: William J. Walkotten Publisher: Forgotten Books ISBN: 9780266842019 Category : Technology & Engineering Languages : en Pages : 20
Book Description
Excerpt from A Recording Soil Moisture Tensiometer The simple - design recorder can be built with readily available materials in a shop equipped with wood and metal working equipment by anyone familiar with these tools. It is composed of four basic sys tems: (l) the porous cup and re lated tubing; (2) the manometer, scale, and mercury storage cup; (3) the float-and-lever system and pen; and (4) the chart drum and drive. These systems are mounted on a plywood and plastic base. The porous cup (fig. 2) is placed in the soil at the desired depth, and the transfer of water through the cup changes the water volume in the manometer system. Two small nylon tubes extend to the soil surface and connect the porous cup to a flushing tube and the recorder. The connecting tubing is cut to lengths suitable to the particular installation. The flushing tube is used primarily to fill the porous cup and balance the manometer system. The recorder tube is sealed to the top of the glass manometer at the recorder. 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.
Author: Southern Forest Experiment Station
Author: Southern Forest Experiment Station
Author: 
Author: Southern Forest Experiment Station (New Orleans, La.)
Author: Howard W. Lull
Author: United States Department Of Agriculture
Author: Arnold Ivan Johnson
Author: Cornelius H. M. van Bavel
Author: Edgar Buckingham
Author: William J. Walkotten
Author: