US Patent 5668719
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Bobrov, V. A., Kan, N. A., Yanchevskaya, T. G., McGrath, Skotnikov, A. V. 1997. Method of fertilizer application and field treatment. United States Patent No 5,668,719. Date of Patent: Sep. 16, 1997.
Bobrov, V. A., Kan, N. A., Yanchevskaya, T. G., McGrath, Skotnikov, A. V. 1997. Method of fertilizer application and field treatment. United States Patent No 5,668,719. Date of Patent: Sep. 16, 1997.