Appendix to the Journals of the Senate and Assembly of the ..session of the Legislature of the State of California . nine borings being made before and afterthe first irrigation, and 12 before and after each of the others. Thequantities of w^ater retained in the upper six feet of soil in the fourirrigations w^ere acre-inches per acre, or 29 per cent, at the firstirrigation, acre-inches per acre, or 24 per cent, at the second irriga-tion, acre-inches per acre, or 28 per cent, at the third irrigation,and acre-inches per acre, or 26 per cent, at the fourth the la
Appendix to the Journals of the Senate and Assembly of the ..session of the Legislature of the State of California . nine borings being made before and afterthe first irrigation, and 12 before and after each of the others. Thequantities of w^ater retained in the upper six feet of soil in the fourirrigations w^ere acre-inches per acre, or 29 per cent, at the firstirrigation, acre-inches per acre, or 24 per cent, at the second irriga-tion, acre-inches per acre, or 28 per cent, at the third irrigation,and acre-inches per acre, or 26 per cent, at the fourth the latter irrigation acre-inches per acre, or 35 per cent, wasretained in the upper nine feet of soil. The average depth at each ofthe four irrigations was inches and the average quantity retainedin the upper six feet of soil was acre-inches per acre, or percent of the total. Adding the estimated loss between irrigations andsoil sampling, the average quantity retained in the upper six feet ofsoil for each of the four irrigations was acre-inches per acre, or34 per cent of the amount Sr/^A/G^T 3J^KfA/l/U£ J^PJ^f^f^rS /K^i^77/Vc//^//^/?(y/iLTiNG gdeffiolmt) V^PT/C/Jl l/A/r5 P^PPf3fr/r /^C/2fA5£3 //VMO/$r</P^ PfPCf/vrAOf3 PUf TO /PP/OAT/OA/0/^PP£3f/VT3 PfPC/^AfTAC^ 0/= AfO/5T(/P£ AT PAT£ O/ SAAfPZ//VO- Fie. 7.—Diagram showing seasonal variation in soil moisture percentage, Hofhenke alfalfa field, Los Molinos, 1914. ALFALFA IRRIGATION IN SACRAMENTO VALLEY. 27 Geer Field. Variations in soil moisture percentages in this field areshown in figure 8. Tlie soil of this field ivS classed as a clay loam ofthe Vina series, the upper two feet being distinctly heavier than theunderlying soil, which approaches a silt loam very closely. The dia-gram shows the wilting point was reached or closely approached in thelatter part of July nearly to the full depth of the six feet irrigations were given in 1914, the respective depths appliedbeing
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