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Illinois Fertilizer Conference Proceedings
January 27-29, 1992

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Table 5: Soil NO3-N concentration of samples taken according to the PPNT and PSNT by previous cropspacer

  PPNT NO3-N Test (ppm) PSNT NO3-N Test (ppm)
Responding sites No. Sites No Manure Manure No Manure Manure
Soybeans 16 3.4 22.7 5.2 13.3
Corn 10 3.4 --- 5.2 ---
Non-Responding Sites          
Beans 5 5.8 23.9 11.1 47.0
Corn 7 7.3 8.4 8.5 10.8

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