Modified Humic Substances as Soil Conditioners: Laboratory and Field Trials by Natalia A. Kulikova, Alexander B. Volikov, Olga I. Filippova, Vladimir A. Kholodov, Nadezhda V. Yaroslavtseva, Yulian R. Farkhodov, Anna V. Yudina, Vitaly A. Roznyatovsky, Yuri K. Grishin, Oral T. Zhilkibayev, Irina V. Perminova

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