78 BULLETIN 699, U. S. DEPARTMENT OF AGRICULTURE. 
experiment, however, three out of four of the series of plots were 
planted to corn in order to determine the effect of the accumulation 
of fertility from previous treatments. The average results of seven 
years’ work are given in Table XLIV. 
TABLE XLIV.—Average yields of corn, oats, wheat, cowpeas, barley, and clover 
hay in a4 7-year experiment at High Hill, Mo. (1907-1913). 
r Cow- | Bar- ; 
= Blues Corn Oats, | Wheat Clover 
Fertilizer. Application per acre. y ; 7} peas, ley, ’ 
8 crops.| 5 crops.| 3 crops. 3 crops.| 1 crop. 1 crop. 
Bushels.|Bushels.|Bushels.|Pounds. Busts Pounds. 
LR TRATTC Se a eee etre oe, Sa, ee oe ee (2710 Sesieo Sb: |) 2 107 ie Sava eee 
Ronenicd t= | ieppeundss feces | ee otal iad ase 
Hevuwie . Foe oes Pee ERS a ee ea Ee ; 
Bone meal. 223552525 5ee= 150: pounds!. <2 022. 0.2 - ip 34.3 34.8 20.7} 1,943 7.5 950 
Rimes. Geers iss See A tones. 266 3.2. SRA 
MOPUME loo 52 oe acees| ee coceeceee- Bo enero 
Ee ene eee ip BO] a0) aaa een 
Potassium chloride......- 5Opoundsisst sie: 2. 2 | 
Niogreatm en tas oso oS aN eee eee EER eee | DBD 23.9 9.0 | 1,267 = TY (il [eats : 
Manure pst aS: es Wh ost ea se eemseee 33.0 27.3 12.6] 1,842 SE eae 
DOSS Aas teesa coe ase | eee O8 co hc 2c eee eesioee = 
Rock phosphate.......... 500 to 800 pounds?........ \ SRS eas Ua ec Fae ee feces: 
IManureveee ete i52 Je7 SONS se ee ee se ceeseee 
Rock phosphate........-- 500 to 800 pounds?,......... ip 36.4 33.9 2055s pve SHDhIEP Sees 
WESTIN Geese ee eee aca Vee See ee ao ee ream see cies } 
Moaure: sees ess ste 8 toms$ 2-22-2222 -2------| 
poe Dhospiate aoqeccpsoss 500 to 800 pounds eceeece-- 38. 7 37. 6 20. 6 1, 717 9. 4 7 1, 975 
Sofie eee ee ee ee ae eee 
1 Application made every two years. 
2 Application made every six to eight years. 
3 Application made every four years. 
As in the case of the other two Missouri experiments no strict com- 
parison can be made between the plots treated with bone and those 
receiving raw rock phosphate, but the indications are that the reen- 
forcement of manure with the latter material was quite effective. 
The experiment field-near Hurdland,t Knox County, Mo., “slopes 
slightly to the east and to the west from the middle driveway, giving 
only fair drainage.” The soil is a dark-gray silt loam about 10 
inches deep, which grades into heavier silt loam and finally into clay 
loam. According to the chemical analysis the soil was well supplied 
with potash and phosphoric acid, but low in nitrogen. The field 
had been in corn and oats for four years preceding the experiment, 
and previously had been in meadow. ‘The field was laid out (like the 
three just described) in four tracts (A, B, C, and D) of eight plots 
each, the corresponding plots in each tract receiving the same fer- 
tilizer treatments. A four-year rotation of corn, oats, wheat, and 
clover (with cowpeas substituted when clover failed) was followed, 
each crop being grown on a different tract each year. The general 
plan of fertilizer treatment and the results of eight years’ work 
(1907-1914) are given below in Table XLV. 
1Mo. Agr. Expt. Sta., Bul. No. 127, pp. 362-370 (1915). 
SLT WF pte 
