TY  JOUR
TI  Influence of predecessors on productivity of a spring-sown field on gray forest soils
KW  precursor
KW  light-gray forest soil
KW  green manure crop
KW  crop yield
KW  spring wheat. 
JO  Vestnik of Kazan State Agrarian University
AU  Borisova, E..
PY  2014
IS  9
PB  Kazan state agrarian University