INFLUENCE OF PREDECESSORS, VARIETIES, FERTILIZERS AND CROP ROTATION ON WINTER WHEAT PRODUCTIVITY IN LONG-TERM EXPERIMENTS (50 YEARS) OF NORTHERN STEPPE AREA IN THE REPUBLIC OF MOLDOVA
The article provides results from the long-term field experiment with crop rotations and permanent crops located in Balti steppe (Northern part of Moldova). The dynamics of yields for winter wheat, sugar beet, sunfl ower and corn for grain is shown for the production conditions in the Republic of Moldova and in the long-term fi eld experiments, conducted by the Research Institute of Field Crops “Selectia”. The infl uence of different predecessors, varieties, fertilization systems crop rotations and permanent cropping are analyzed for winter wheat. The nitrogen use effi ciency and the share of soil fertility in yield formation for winter wheat have been determined in the long-term field experiment.