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USE OF COMMERCIAL FERTILIZER IN A TWO YEAR ROTATION OF CORN AND WHEAT

This experiment was designed to determine the effects of commercial fertilizer application on crop yields in a two year rotation of corn and wheat in western North Dakota.

In this trial corn is grown on spring plowed wheat stubble and wheat is grown on spring plowed corn stubble. Fertilizer application is made on: both corn and wheat; corn only; and wheat only. The trial also includes a planting where no fertilizer is used on either crop.

Rate of fertilizer application is based on soil test. The application rate also depends on soil moisture at seeding time. Fertilizer rates used at different soil moisture levels are shown in the following tabulation.

Fertilizer Soil Moisture at Seeding
Low Medium High
Nitrogen on Corn 15 Lbs. Acre 30 Lbs./Acre 30 Lbs./Acre
Nitrogen on Wheat 10 Lbs./ACre 25 Lbs./Acre 40 Lbs./Acre
P205 on Corn 35 Lbs./Acre 35 Lbs./Acre 35 Lbs./Acre
P205 on Wheat 35 Lbs./Acre 35 Lbs./Acre 35 Lbs./Acre

Tables 27 and 28 summarize yield data from this trial for the period of 1955-65.

Table 27. Wheat Yields in a Two Year Corn - Wheat Rotation Under Different Systems of Fertilizer Application
Wheat On: Yield in Bushels Per Acre 11 Year Average
1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
Cornland, No Fertilizer 17.2 2.7 10.4 24.1 9.7 11.1 1.0 --- 25.2 8.2 24.9 12.2
Cornland, Fertilized 27.8 3.3 14.7 25.7 9.9 15.1 .67 --- 30.7 12.3 30.1 15.5
Cornland, Corn Fertilized the year Previous 25.5 3.1 12.3 25.6 7.7 14.1 1.1 --- 26.3 12.2 21.9 13.6

 

Table 28. Corn Yields in a Two Year Corn - Wheat Rotation Under Different Systems of Fertilizer Application.
Corn On: Yield in Tons Per Acre @ 70% Moisture 11 Year Average
1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
Wheat Stubble, No Fertilizer 2.9 3.2 8.7 2.5 1.8 2.2 3.9 6.0 5.3 4.4 6.7 4.3
Wheat Stubble, Fertilized 3.0 3.1 8.5 1.8 1.4 1.8 4.1 7.3 5.8 5.1 7.5 4.5
Wheat Stubble, Wheat Stubble Fertilized Previous Year 3.0 3.5 9.3 2.3 1.3 222 3.4 5.5 4.4 5.0 5.8 4.2

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