Appendix to the Journals of the Senate and Assembly of the ..session of the Legislature of the State of California . no morethan two-fifths in the upper 12 feet of soil, is evidence that throughtoo deep penetration at the upper ends of the checks, much water iswasted in attempting to irrigate the lower ends of the long checks—1,270 feet in this field. Lawson Field. The soil in this field is classed as a silt loam. Mois-ture determinations were made from eight borings before and afterthe third irrigation in 1913, at which irrigation a depth of inches 46 TRRKJAlION INVKSTICATIONS JN CAIJKOI
Appendix to the Journals of the Senate and Assembly of the ..session of the Legislature of the State of California . no morethan two-fifths in the upper 12 feet of soil, is evidence that throughtoo deep penetration at the upper ends of the checks, much water iswasted in attempting to irrigate the lower ends of the long checks—1,270 feet in this field. Lawson Field. The soil in this field is classed as a silt loam. Mois-ture determinations were made from eight borings before and afterthe third irrigation in 1913, at which irrigation a depth of inches 46 TRRKJAlION INVKSTICATIONS JN CAIJKOItNTA. was applied. Of this, acre-inches per acre, or 35 per cent, wasfound in the upper six feet, with two-fifths in the surface foot. Anappreciable portion of the water applied undoubtedly penetrated belowsix feet in depth, but under the present conditions it is reasonable toassume that the greatest loss was due to evaporation during the ex-tremely hot weather prevailing at the time. In general, the determina-tions indicate a lack of uniforraitv in water distribution. MAT JUNB I JULY ! AUG. ! SEPT. 5r/?A/G^fTSP0A£/Vl///£ P£P;iFJ£N7Z^ U//AT/A/G /O^/VACwILTIMG COEFFICIENT) V£Pr/CA/. L//^^5 P££5£^r WC/?£A5£5 //V MO/SrC/P£ P£j5C£A/7?iG£5 ^0£ TO /R/?/GAT/0//O P£Pfi£5£/V7:5 P£/^C£NTAir£ O^:^>iP7PLWG Fig. 15.—Diagram showing seasonal variation in soil moisture percentage, Hughson alfalfa field. Woodland, 1914. Beck Field. The soil of this field is classed as Yolo loam. Soilmoisture determinations were made from nine borings at each cuttingand before and after each irrigation in 1914. Results, as platted infigure 16, indicate a very uniform decrease in moisture content of thesoil from the beginning of the growling season until the first irrigationafter the third cutting. The moisture present was above the wiltingpoint throughout the upper six feet at the time of the first cutting,but wai3 reduced to or below the wilting point by the second cut
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Keywords: ., bookauthorcaliforn, bookcentury1800, bookdecade1850, bookyear1853
