OCR Text |
Show The Duty of Water in Cache Valley, Utah 5 the experiments were conducted, although they should be useful in estimating the water requirements on other types of soils. The experiments were begun in 1902 and extended up to 1919. This gives a total period of 17 years for certain of the treatments. It is to be regretted that results are not available for all treatments during this entire period. Jan. Feb Mar Apr May June July Auq Sept Oct Nov- Dec Fig. 2.- Precipitation during each month at Logan, Utah. Average for the years 1902 to 1919. In order that weather conditions during the period of the experiment might be better understood, the precipitation record is shown graphically in Figures 1 and 2. The first of these shows the total annual precipitation during each year; the second shows the 17- year average precipitation of each month. The water was measured through a trapezoidal, or Cipolletti, weir and was carried to the land in wood flumes so that the amount given represents the net amount that actually soaked into the soil. In interpreting these results in a practical way, this must be kept in mind since the ordinary farm is subject to ditch and waste- water losses which must be added to the figures given herein. Irregularities in yields are often traceable to the fact that the complete series were not run through all the years. It must, |