The effect of various organic fertilizers (wheat and pea straw, manure
, green fertilizers-rape, clover) on gray forest soil fertility and yi
elds in 5-field rotation has been compared with that of mineral ones-6
0(NPK). Organic fertilizers account for the formation of humus, nitrog
en, and phosphorus pool, for the composition of neoformed humous subst
ances and nitrites; they exert a positive effect on all the prerequisi
tes of soil fertility (biological, agrophysical), so that they increas
e yields in rotation by 3.2...5.8 c/ha fodder units.