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Title: Report on the Agriculture Experiment Stations of the University of California (PH 4-16)(1890) Collection Type: Directories and Documents Collection Name: Pamphlets Catalog #: PH 4-16 Author: E.W. Hillgard Published: 1890 # of Pages: 211 Download PDF: User Login Required Download OCR Text: User Login Required

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Original Held At: Searls Historical Library Location: 161 Nevada City Hwy, Nevada City, CA 95959

Page: of 211  

98 UNIVERSITY OF CALIFORNIA. Sandy Loam Soils. Experiment Station, near Paso Robles. No, 1147. No. 1126. No, 1148 2 it ; 12 inches 12 inches poate Back Land. Swale Soll. { i Coarse materials>0.5™™ _.. 2.. .-.----------. 39.5 20.5 . 153 Mine! earths 9 econ es ee or . 60.5 79.5 84.7 Analysis of Fine Earth. Insoluble:matten o25.0ce coset a ee 85.12 87.26 Yoo yx) 81-79 Loo 31 Robie Rig oe eee . 557 90.69 519 bo245 . 852 } Porashh (Ri) ene eee one ee eee 68 40 ene, Soda (Na,0)..-.-----81 35 b> ae Lime (Ga) 2-323 34 .26 . Al Mapnesia (Mp0) a 555 tee cen ee ate cae 87 32 45 Br. ox. of manganese (Mn,0,)--------------04 .03 . 04 Peroxide ofiizon) (Re.Os)s-ceasescceasno enue 3.83 1.68 . 3.26 Alumina CAI? Qs) 028 ee esc ty BR ae ee L74 2.93 2.80 Phosphoric acid (P-O,) 2s. ooo cne nee e es 07 .02 .06 Sulphurio acid’ (SOs) sess snc castes ene .03 05 OL Garboniojacid: (GOs)! 2s coach aaa ees ees Sea OL ee [O oe e ee [ocean tneaeeee Water and organic matter -.-.-.-----.-.-. 2.19 1.86 2.12 ANG ea fae a ea LE Ripe.) Se By see Ashe Sol. phos. acid_UO a ea Se A ee Sat peal ae Hygroscopic moisture (absorbed at 15° C.)_--1.84 The sandy nature of these soils is well shown in the large proportion of inert matter and the low moisture absorption; the latter is so low in the front land soil, that but for the great depth at all points it would constitute a serious defect, and would necessitate very frequent irrigation. But as there is scarcely a noticeable change in the nature of the soil for eight feet and more, both moisture and nourishment can be sought by the roots independently of the surface soil. As a matter of fact, however, moisture sensible to the hand is always found in this land at a depth of six or eight inches, and the roots of the smaller plants are usually found, unhurt by drought or heat, much nearer the surface. It thus becomes intelligible how this land can be cultivated without irrigation, despite the long, hot, and rainless summer. Chemically the soil (No. 1147) shows its granitic origin by the abundance of potash present, with, for California, a relatively small proportion of lime, which, however, does not amount to a deficiency in go sandy ® soil, and still imparts to it the characters of a “calcareous” one. For 8° sandy a soil, again, the supply of phosphoric acid is quite large, especially. in view of the great depth to which roots can readily go. The supply of humus is only fair and might advantageously (to moisture-retention) be increased. The soil is therefore a very good one of its kind, and likely be lastingly productive. : ‘ As to the sandy soil of the back land (No. 1126), it will be noted tha male achgaearrbe less of “ coarse materials” than eh from the front Jan" portion is t tl + the latter naturally its percentages of ‘< A Me t be co respondingly smaller i? t} ‘ uble ingredients mus tion rcsponcingty Smalier if the two soils are otherwise similar, ‘The reduc® in the essential ingredients is, however paar a be on the soning ‘ill b » HO , greater than it should be 0? ground, as will be seen on comparing the ff lime; hosphoric acid : § the figures for potash and 1 jupnosphoric acid percentage is extremely Joy but q f it is in the § ble form, the soil may not show a defie ¥, DUG a8 Bi) OF 1b 1820 . ” ome ciency in this ingredient for