MULCHED-BASIN SYSTEM OF IRRIGATED CITRUS CULTURE. 9 
The treatments included (1) spreading manure broadcast in the 
irrigated space between the tree rows and disking it in; (2) burying 
the manure in a circular trench 18 inches wide and 12 inches deep, 
located under the drip of the tree; (3) applying the manure as a 
surface mulch in the basin, which was approximately 15 feet in diam- 
eter, with the tree in the center; (4) trenches containing alfalfa in 
place of manure; (5) basins mulched with alfalfa in place of manure; 
(6) sweet clover as an irrigated cover crop between the tree rows; 
(7) barley as an irrigated cover crop; and (8) the usual disk culti- 
vation and furrow irrigation as a check. The treatments were also 
repeated with the addition per tree of about 100 pounds of flue dust 
from the neighboring cement works, having the following compo- 
sition (analysis by J. F. Breazeale) : 
Per cent. 
Calcium carbonate___ 28 BORE ae eee Ne Sele imate BRE oe 53. 40 
Calcimyoxid22 ss EO acca PERS Teel tee Wee lion de Pt 13. 16 
Calcnimesuilph a teas ese be eet ee eT eo eee at tO OO, 
Phosphoric acids (2:03) 22223] ae eee z ees. NARS ets ee ETS 
Potash (©) 2e3 2s es Se Sye A We Nyasa oc eee 2 Sy Ore aero ee Se gl oe .95 
Insoluble (in dilute HCl) Ses Wire ESN 2 eal sae AUS se By 84 
Twenty cubic feet of manure per tree were used in each of the 
manure experiments, and one bale of alfalfa per tree (about 125 
pounds) was used in each experiment with alfalfa. A row of orange 
trees (about 48 trees) was used for each treatment, and each alter- 
nate row was left untreated as a guard. 
TABLE II.—Average percentages of total soil moisture to a depth of 3 feet in the 
Vivienda grove, California, in 1915. 
Dates of sampling before and after irrigation. 
Co) o 7) = > oD +S e : “0 : 
2 qd q foal oo — Lo) 2, » a ~ my 
Soil treatment. Bee) s S Ge 5 Fools A su koe GS 
Fae ad 2 PS a 2 S ie 2 3 een me st Aas z si nl o S 
Se Sle te eS Son per ae | Se eee 
et fo?) a Oo at (0) aa {>) Get ®D St [>] 
<q aa) <q aa) <q faa) <q aa) < aa) <q faa) 
Manure: 
Surface disked......-..- IPR US) WAS MS Gh SIE) 7a ee ee he ar fay lle OD Von er ea ee 
Same, plus lime........ JOS SG) | aS eS te Oe IB IEs) Steel aN aes eC) ee ee 
Mrenchied 9 se 55 ete TOES oleae pull ea liegidale Gan gleageo | Ae Sula: 8G le(1) le see | patie Pa eet 
100) SESS = sccocnse soe 1 2EO NE OE OF SOF OS 2a lilmoales Seo) el 2a2 ne Sela LIS waseons 6.3 
Same, plus lime........|.....- 10.0 | 14.4] 9.0} 12.8 | 9.2] 14.8] 9.4] 13.7 7.8 | 14.1 8.6 
Alfalfa: 
Trenched. Sie eleratcecints Sraers TAR OM Sec Oer 2: | AS Sil aea ie plies Sarin lero per onal toes a |= (5) ean eect eye | eee 
In basins... . oyeee arsine WAS We |) WED Bow Pabloay Seba eas as ie eh Rus | 14.0 6.2 
Same, pluslime..-....-|...... 10.6 | 13.8 | 10.4 | 12.8 | 10.3 | 18.5 | 9.8] 13.9 | 9.7 | 12.3 9.7 
Sweet clover: 
CovenrcrOps--222----a-- UBS Ue OoTA UR Cy reals Gat eG) lee eeeslesseecisdesce sccceslecgesc 
Same, plus lime ....... 68) Os Oy By RO pa A S83 lO) el Bee eee lsouooalod socal seannallsasose 
Barley: 
Cover Crop. 2---,5------ UA ZF eee led A ae ol (CD) Pal Se Re eer ee eee eerie ese class sl meas 
_ Same, plus lime........ SL eels On ON al) 10 ele On| ores er cpeesai |= tee lle css arcrel| eo eee ee beeee eee 
Disk cultivated Fe SEW ree 1WS® eo B) | © | Wo) WED Gee le eS Gay es hoe callesccoalasccon 
Same, pluslime............ IA) Wt PE SS Mo TE BI as Petia as A877 NG) Woe coe lego sdolesaece 
1 Basined.- 
68279°—Bull. 49917 2 
