EXPERIMENTS WITH ALFALFA AT YUMA 5 
or the 1st of March, there would have been a much greater increase 
the first year, though this undoubtedly would have resulted in smaller 
increases the second year. 
TABLE 2.—Alfalfa yields from various fertilizer treatments at the United States 
Yuma Field Station, Bard, Calif., in 1923 and 1924 
SEASON OF 1923 (FIRST YEAR) 
Yields of hay per 4-acre plot Yields per acre 
(pounds) (tons) 
Fertilizer treatment and rate per acre Cuttings 
eee 
Total Total | eos os 
First, |Second, | Third, SEES 
June 14| Aug. 14} Oct. 10 =) 
16 per cent acid phosphate (250 pounds)-____________- 395 275 320 990 | 1.980 0. 800 
(CLO esa oe a 2 ole Oe ee ee ee 185 170 235 590 LelS0; es: Soe 
16 per cent acid phosphate ea pounds in the spring 
ride2o0 pounds 1n the fall) <3. 222 a es a, 305 280 298 | 883 | 1.766 . 732 
ee eee - Eee 245 115 157 517 D034) (ezeccea ack 
16 per cent acid phosphate (500 pounds) -____________- 430 415 392 | 1,237] 2.474 1. 304 
(SUING epee eae ac cane ene peels Seal er paar ige 175 185 225 585 PON | Sears 
44 per cent acid phosphate (182 pounds)____________- 420 430 387 | 1,237] 2.474 1. 050 
OTR ee heen ie ars re IS Ey oe ee BS a FD 215 250 247 712 1 Ege, D7 Nal eee ere ee es 
16 per cent acid phosphate (750 pounds)_____________ 500 510 398 | 1,408 | 2.816. 1. 672 
Whe ckeeet Oni i ee rarities a aed hls 195 205 172 572 PEV44. | 2 tee 
Manure (12 tons) plus 16 per cent acid phosphate 
at OU) Stee see eee ees Ree 510 625 439 1, 574 3. 148 1. 372 
Re Sara ese ss Meet ea ee on Pee Berg 5 3 es Be 280 275 333 S887 L776: | sees 
Manure (IPAS OY aS) em a Ne ee a 470 485 310) | 2 265 1.22530 420 
poe i tee Uae ten aed BEATE ALL, fe th 460 360 235 fT Oho | C2110 133 Fe 
esas gulf sulphur (200 pounds) -___----_---_--------- 305 255 180 740 | 1.480 —. 060 
Gillie Chiles Setioa-seet en ie tery ere 285 300 185 LOT NAO Pee 
‘Roro sulphur. (200 pounds) = 2 = 2 * 250 170 120 540 | 1.080 —. 320 
Cec kee tra ett tetera ee Poe te ae 270 225 205 700; |S 15400) |e re a 
Toro sulphur (200 pounds) plus 16 per cent acid 
phosphate (250 pounds) --___-_--------------------- 455 440 265} 1,160 | 2.320 1. 240 
Cec eee eae ae Se ee ee ten Pa ae Se SE Ee 205 180 155 540 15: 0803 | 2522 sa = 
SEASON OF 1924 (SECOND YEAR) 
Yields of hay per 44-acre plot (pounds) 
Yields per 
acre (tons) 
Cuttings 
Fertilizer treatment and rate per acre 
First,| Sec- | Third,|Fourth,| Fifth,| Sixth, | Total ; 
Jan. | ond,| May | June | Aug.| Oct. Tofalets 
11 /Apr.5| 16 20 14 24 PETES 
16 per cent acid phosphate (250 pounds)-|} 180 | 435 415 385 | 295 160 | 1,870 | 3.740 | 2.390 
CCl EG Nee ae Des at RD eae alee eae 35 85 155 170 100 130 6/52 elas 50 
16 per cent acid phosphate (250 pounds 
in the spring and 250 pounds in the fall)_| 190} 660 555 525 | 325 220 | 2,475 | 4.950 | 3.520 
MON GGK cere eat toe ee a 50 105 140 160 125 135 TANGY WP Age BD) 
16 per cent acid phosphate (500 pounds)__} 190 | 390 400 425 | 290 255 | 1,950 | 3.900 | 2.450 
OUGC <2 a= ee ee ee ee er eee eee 25 95 130 135 | 145 195 125 le de450) ete 
44 per cent acid phosphate (182 pounds) --| 240 | 625 570 610 | 355 200 | 2,600 | 5.200 | 3.100 
CGD es ee a a ee ee ee 45 165 235 235 195 75a} EESO50) 122210002 
16 per cent acid phosphate (750 pounds)--| 295 | 800 705 780 | 545 370 | 3,495 | 6.990 | 4. 980 
ChiCe ees ag a es ie er se 40 140 180 205 185 ZOD OOD! [2 LON | eee 
Manure (12 tons) plus 16 per cent acid 
phosphate (250 pounds)_______________- 365 | 920 810 TED | G35 480 | 3,860 | 7.720 | 4.550 
ANG ieee 5528 Spee DR Mayas ek Eo eee goon eee mee 110 | 320 275 330 | 260 290 | 1,585 | 3.170 |.--_-- 
SeMeMPIEe LOWS = ne ee Say 305 | 815 695 790 | 475 470 | 3,550 | 7.100 | 2.740 
IG Cha gre ea re ae Beg eh 185 | 490 370 485 | 360 290 | 2,180 | 4.360 |_____- 
Texas gulf sulphur (200 pounds) _______-. 105 FANS 275 350 185 260 | 1,390 | 2. 780 390 
©) Reis 5 OEE oS See WT Rees ek ae 100 |} 210 265 275 | 170 Ze led LOE | 2. 300s ae 
cane splpbar (200 spounds) S222 i Se 60 80 170 195 75 305 885 | 1.770 | .426 
SE Eh eat he Sieg t= eS Sei re SS | 62 70 105 165 | 120 150 Gli) 1344s eee 
Toro apie (200 pounds) plus 16 per | | 
cent acid phosphate (250 pounds) __-_-_-_- \> -162:.)_/ 220 295 295 | 170 220 | 1,362 | 2.724 | 1.378 
eee eee ee ae ee. | 3 | 90 155 115 95 165 673. |: 1.346) jo 22== 
