Fifty Years of Field Experiments with Crop Rotations and Continuous Cultures at the Selectia Research Institute for Field Crops
Experimental data are presented from long-term field experiments on Typical chernozem in the north of Moldova. Yields of crops in rotations and continuous monocultures are evaluated and compared with national averages. The effects of fertilization and crop rotation have been determined, including links within rotations – especially the different predecessors for winter wheat; generally, the better the predecessors, the less are the benefits of fertilization. From both economic and ecological perspectives, it is better to respect crop rotation than to compensate for its absence with an excess of agrochemicals for crop nutrition and protection. Changes in the stocks of soil organic matter have been established under crop rotations, black fallow, continuous monocultures and meadow; losses are much higher under black fallow and continuous crops than under crop rotations. Under meadow, it takes 25 years to restore the initial stock of soil organic matter.
KeywordsSoil Organic Matter Sugar Beet Winter Wheat Crop Rotation Annual Loss
This work was possible thanks to the time and effort of many researchers, technicians and staff over the whole period of 50 years.
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