Identification of fertility zones and assessment of potential crop yield based on biological farming approaches von Natalia V. Ovcharova, Marina M. Silantieva, Vladimir I. Belyaev, Yuri A. Gulyanov, Lyudmila V. Sokolova, Tatiana G. Plutalova, Irina Yu. Botvich, Dmitriy V. Emelyanov, Nikolai P. Belov

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