File:Preparing land for irrigation and methods of applying water (1904) (14778669742).jpg

Identifier: preparinglandfor145unit (find matches)
Title: Preparing land for irrigation and methods of applying water
Year: 1904 (1900s)
Authors: United States. Bureau of Irrigation Investigations United States. Office of Experiment Stations
Subjects: Irrigation farming West (U S )
Publisher: Washington : U.S. G.P.O.
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
resultsof common practice. The first irrigation was May 27, before whichmany fields in the valley had been watered two or three times. The furrow method is used almost exclusively in the irrigation ofgrain. Here it is more essential that the space between the furrowsshould not be flooded than in the case of alfalfa, because the younggrain does not always make sufficient growth to shade the groundbefore the first irrigation. Last spring the grain upon the stationfarm practically covered the ground when first watered. After thegrain is sufficiently grown to be in danger of lodging, it should notbe irrigated when the wind blows. To facilitate handling the water it is best to run a smaller ditch orfurrow parallel with the head ditch, into which water is turned atconvenient intervals from the head ditch, these intervals to be deter-mined by the number of furrows that can be filled by the head of U. S. Dept. of Agr.; Bu . 145. Office of Expt. Stations. Irrigation Investigations. Plate VII.
Text Appearing After Image:
Fig. 2.—Furrower Used by D. C. Wheeler, Reno, Nev. 69 .water in use. For instance, referring to figure 31, if the head of wateris about what can be carried by ten furrows, put a tappoon across theditch between A and B, open the ditch at A, and fill the space betweenthe ditch bank and the land at X. The water is thus turned into thefirst ten furrows. When this part of the field is sufficiently wet, firstput in another obstruction at Y, put in a tappoon between B and C,make an opening at B, and close up A. The water is thus turned offfrom the first ten furrows and into the second ten. In some cases itis better to have water run from two or more openings in the headditch at once, depending upon the amount of water used and the fallof the head ditch. Making and breaking dams in the head ditch and making and closingbreaks in its bank are not in keeping with the best irrigation practice.In permanently laid-out fields the ditches should be provided withboxes or with back flows for the cont

Note About Images