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Byl proweden polewoj äxperiment s 8 obrabotkami: 50%, 100%, 150% NPK, 100% NP, 100% N, 100% NPK+FYM, 100% NPK-S i kontrol', powtorennyj chetyre raza w randomizirowannoj blochnoj sheme. Rekomenduemaq doza (100%) NPK dlq soi sostawlqet 20:80:20 kg ga-1 N, P2O5 i K2O, sootwetstwenno. Jeti pitatel'nye weschestwa wnosilis' cherez mochewinu, superfosfat (DAP dlq obrabotki bez sery) i mumiat kaliq. Organicheskoe udobrenie w wide FYM wnosilos' w kolichestwe 5 t ga-1 tol'ko pod soü (sezon Harif). Rezul'taty äxperimenta pokazali, chto fiziko-himicheskie swojstwa pochwy, takie kak pH i EC, suschestwenno ne izmenilis' dazhe posle mnogokratnogo wneseniq udobrenij w techenie poslednih chetyreh desqtiletij. Posledowatel'noe dobawlenie S udobrenij uwelichilo dostupnyj S status i S frakcii ot ego perwonachal'nogo sostoqniq i naibol'shee osazhdenie (42,66 kg ga-1) w obrabotke, poluchawshej 100% NPK+FYM, za kotoroj sledowalo 150% dobawlenie NPK (39,30 kg ga-1). V to wremq kak samoe nizkoe sostoqnie bylo zafixirowano pri neprerywnom wnesenii udobrenij bez sery. Isklüchenie sery w sheme udobreniq okazalo pagubnoe wliqnie na urozhajnost' soi, a takzhe na dostupnost' pitatel'nyh weschestw.