78 



BULLETIN 699, U. S. DEPARTMENT OF AGRTCULTUEE. 



experiment, however, three out of four of the series of plots were 

 phmted to corn in order to determine the effect of the accumuhition 

 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, coivpeas. harley, and clover 

 hay in a 1-year experiment at High Hill, Mo. (1907-1913) . 



Fertilizer. 



Legume 



Do 



Bone meal 



Legume 



Bone meal 



Lime 



Legume 



Bone meal 



Lime 



Potassium chloride. 



No treatment 



Manure 



Do 



Rock phosphate 



Manure 



Rock phosphate. . . . 



Legume 



M inure 



Rock phosphate 



Legume 



Lime 



Application per acre. 



Corn, 



8 crops. 



150 pounds' 



150 pounds 1 

 lton2 



150 poundsi 



1 ton2 



50 poundsi. 



Stonss 



do3 



500 to 800 pounds 3 



8 tons3 



500 to 800 pounds' . 



Bushels. 

 27.1 



} 32-7 

 34.3 



34.0 



22.5 

 33.0 



34.7 

 36.4 



8tons3 



500 to 800 pounds ' I ^g ,, 



Oats, 

 5 crops. 



Wheat, 

 3 crops. 



Cow- 

 peas, 

 3 crops. 



Bar- 

 ley, 

 1 crop. 



Bushels. 

 31.0 



Bushels. 



8.5 



Pounds. 

 2,117 



Bushels. 



4.7 



40.6 



21.5 



2,057 



6.5 



34.8 



20.7 



1,943 



7.5 



33.9 



22.2 



1,595 



7.5 



23.9 

 27.3 



9.0 

 12.6 



1,267 

 1,842 



3.7 

 3.7 



30.0 



17.2 



2,071 



4.7 



33.9 



20.5 



1,775 



8.2 



37.6 



20.6 



1,717 



9.4 



Clover, 

 1 crop. 



. Pounds. 



975 



1,275 



1 Application made every two years. 



2 Application made every six to eight years. 

 ' 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,^ 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 w^as 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 com, 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. 



iMo. Agr. Expt. Sta., BuL No. 127, pp. 362-370 (1915). 



