52 BULLETIN 699, U. S. DEPARTMENT OF AGRICULTURE. 
In 1889 the North Louisiana Experiment Station began a number 
ef experiments with corn.t One of these had for its object the 
testing of the effect of various phosphatic fertilizers alone and in 
combination on the crop yields. This experiment was carried on for 
five years, but the raw phosphates were not introduced until the 
second year. The results obtained each year were published inf 
separate bulletins,? but for the sake of brevity and clearness they are 
here all incorporated in one table. As in the case of the cotton ex- 
periments carried on at this same station, the size of the plots em- 
ployed is not mentioned, and the only description given Cs the soil is 
that it was poor. 
The land was plowed during the winter and fertilized in the 
spring. The eorn was planted in rows 5 feet wide and 3 feet apart in 
the drill. The complete results are given below in Table X XVII. 
TABLE Beast —Results obtained at Calhoun, La., in the growing of corn 
(1889-1893). 
Applica- Yield per acre of corn. 
Fertilizer. : tion per 
? acre. 1889 1890 1891 1892 1893 
Pounds. | Bushels. | Bushels. | Bushels. | Bushels. | Bushels. 
Gy DSuan ee ee an Seen eeeenese 56 26. 69 21.00 15.00 13.60 16. 00 
Diesolved bone black 205). ocr Sao ae eee 112 28. 00 23.00 2505 25. 20 19. 60 
IBASalIMNEXG Ine eo hee ae eee Soe ee ene 336 25.00 28. 00 14. 25 32. 80 22. 00 
BLD ee FBR a se RIB poe ak 420 
Dissolved bone eee etree a iia |} 22.00] 23.14] 12.75] 25.60 21. 80 
Gry PSUS He Ue ras ee Set Rees Soe ae 56 14. 49 * 14.42 6. 00 10. 80 8. 86 
Acid Bbessinte Bee Loe tag 8 Dr ae eles aes 112 13.00 12.17 5.25 17.20 8.80 
BPG saatb-cnbing ee eags as aoe ea oo senbooeee 420 20. 00 18. 25 10.50 18. 80 16. 80 
INO AMANUTC RAs Says che Oe Se ee Rn pee po ale 12.00 11.00 4.50 8. 40 7.60 
Basal aM ESGUTe sos Ae Aes See Boe bs 420 
Re ye ee eee ee i \ 22.19} 18.13] 13.88] 23.20 24.00 
IBoneneall pees Fe ae see gee eR 112 14.10 13. 00 10. 50 11. 20 17.60 
SD ASaMERGULC be sess see ache oe ae eras eens 420 17.00 20. 32 13.50 29. 40 21.60 
ID (0 \eaten he Se One er) Renee ek Senn 420 
Bone icaee bere) a aie ey 119 17.50 20. 78 17. 25 31.20 24. 80 
SouthiCarolimavloats: sy ees eee ee TTD) ea. Meee 9. 00 6.75 13. 60 15. 60 
IBasalvimixsthaness so Feel Mi aera eee AD Qe a cee 22.00 14. 25 28. 40 20. 40 
HD Yo anes yee eee Meas par Me eran ee ee NS EE ADT eae Me 
South; Carolina tloats. se 2. osc eee we Sac ae th am ik eee Se } BiG foe 29730 a 
INQUITMA MOTO See A foe ec aa ee clean ean NG ee | 9.10 6. 75 14. 00 10. 50 
The wider differences between the yields of the various plots re- 
ceiving “basal mixture” show that this field was not of uniform 
fertility. 
A careful study of Table XXVII will also show that the soil 
seemed to respond much more readily to the nitrogenous than to 
the phosphatic fertilizers, but the applications of the latter were 
rather light, particularly for the relatively insoluble phosphates. 
With the exception of those treated with bone or dissolved bone black, 
the plots on which phosphates were applied alone gave on the whole 
little or no increase in yield over the unfertilized plots. While 
floats alone gave no increase in yield for the first three years of the 
experiment, the crop produced the fourth year on this plot exceeded 
the no-fertilizer plots by a considerable margin, indicating that 
Ifa. Agr. Expt. Sta. Bul. No. 27 (1890). 
*¥.q. Agr. Expt. Sta., Buls. Nos. 8, 16, 21 29 (new series). 
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