Earliness in northern corn as affected by phosphate fertilizers, manure, and other soil treatments
1934
Olson, P.J. | Walster, H.L.
The comparative maturity of corn was studied during an 8-year period on plats receiving various soil treatments. Phosphorus advanced maturity significantly. During 3 of the 8 years when the date on which plants silked in the various plats was determined, it was found that phosphorus had advanced silking about 2 days. The combination of manure and phosphorus advanced the silking date about 3 days during this period. Lime or potassium did not influence maturity consistently. Manure advanced maturity somewhat. During 3 consecutive years that date of silking was noted, the crop was definitely advanced on the manured plats. The differences during the other years were of a low order in the majority of cases. The correlation between yield rank and maturity rank was low. The increased maturity of the crop was not sufficient in degree to warrant, by itself, the application of phosphorus. However, the increased yield of corn, wheat, and oats, all of which was a credit to phosphorus since the application was made only once during a rotation period including these crops, was apparently sufficient to cover the cost of application. The enhanced maturity, therefore, essentially represented the margin of profit from the soil treatment.
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