80 BULLETIN 699, U. S. DEPARTMENT OF AGRICULTURE. 
TasBLeE XLVI Average. yields of corn, oats, wheat, clover, and cowpeds im an 
8-year UDEV at Laclede, Mo. (1907-1914 ) 
oe aig Corn, Oats, Wheat, | Clover, | Cowpeas 
Fertilizer. Application per acre. | ¢ crops. | 6 crops. | 6 crops. | 2 crops. | 4 ines 
Bushels. | Bushels. | Bushels. | Pounds. | Pounds. ¢ 
DOS time ss eso. S| eee oe ace cine eee 32.6 28.3 14.4 2,970 2,127 © 
DY) ek 5 ae i a a SN a eI a 39.1 35.3 16.9 4, 540 3,377 
Boneaeales soos ees ek ee 150; pounds! assess see 3 
SOSUIME ae ere ke oc ces ceed | as eect seats renee 
IBonermealseees are 2 eae L50;pounds Dee eee see 43.3 37.3 16. 2 4,650 3,604 
ame ai hes el er Ltn? AW Ae ee 
Tesamer ee 2a rea sepuseess ae on 
onennealerases ae Sasson JO/POUNG Sea ceeceee eee 
Far poe Cannon a a Se 1 cHonwieaee ae ae 46.1 40.3 19.9 4,940 3, 582 
Potassium chloride.......-. HOWPOWNUS Seen eee 
INO treaimente ays Sears |e ose ooh ac eee eee 36.1 392, 7 1183 1) 3, 426 2,396 
Mantire soe Ss Sttons se ees 47,2 35.6 14.9 3, 104 2,637 
WO scuc gags sposobece st SARI € Sau seiescooods: \ 47.5) 351) - 45] 3,560] 3, 116 
Rock phosphate... .......- 500 pounds 4:2 esse Seen eel he z ; 2 ? 
ANUTO Hae eee Cas eete SibOnsie2 seo ueerccee cen 
Rock phosphate.........- S00} pounds4 sae. ess ssece 45.8 35. 0 14.3 3, 670 3,277 
MES CUIME Se ors cae ee ce a Sek ch Aeneas). wes cleo aoe 
1 Applications made every two years. 
2 Applications made every eight sen. 
8 Applications made every four years 
4 Applications made every four years, , but in 1913, the rate was inceased to 1,000 pounds per acre. 
The results obtained on the Laclede field are in a general way | 
similar to those obtained at Hurdland, namely: The reenforcement of 
manure with phosphate rock apparently had little influence on the 
former’s effectiveness, except in the case of the clover and cowpea 
crops. On the other hand, plots treated with bone meal in connec- 
tion with a legume produced considerably better average yields of all 
crops than plots receiving the legume treatment only. 
As in the case of the three previous experiments, however, no strict 
comparison between the bone and raw rock phosphate plots is pos- 
sible, and since the yields of the various crops in the individual years 
are not given, the residual effect of the phosphate treatments can not 
be determined. 
Four out of five field experiments with raw rock phosphate con- 
ducted by the Missouri Experiment Station cover a period of over 
five years. Two out of the four experiments reported in detail show 
increases resulting from the liberal use of raw rock phosphate in 
connection with organic matter. The other two show little or no 
benefit from applications of this material. No attempt was made in 
any of these experiments to compare the fertilizer value of raw rock 
and acid phosphate. 
NEW JERSEY. 
The first work of the New Jersey Experiment Station! on raw 
rock phosphate consisted of a series of cooperative experiments con- 
ducted by farmers in different sections of the State. Most of the 
experiments were conducted for one year only, and while several - 
iN. J. Agr. Expt. Sta., 6th, 7th, 8th Ann. Repts, 
¢! 
