Abstract
Heterogeneous crops are more close to natural bio-coenosis compared with the single ones. In mixed coenosis competition relations present between plants at certain conditions. The relations are based on direct competition for the main survive factors with physical-mechanical and biochemical interaction. But co-growth of plants causes not only negative interaction but often it has a positive action on coenosis components. To avoid tensions in agrocoenosis the principle of crop complementarity should be taken into account at selection of components for mixed crops which complement each other. Lupin demonstrates its biological potential in coenosis significantly better compared to the other grain legumes and is a factor for mobilization and use of sun energy and other natural resources. In experiments interaction type have been tested between narrow-leafed lupin SN-78-07 and white lupin var. Alyi Parus (2018), oat var. Pamyati Balavina, Sudan grass var. Kinelskaya 100 as components of mixed crops for their average yield. Their competitiveness ability and aggression level are studied. Aggression coefficient and competitiveness ratio have been used to evaluate interactions. The article presents the strengthening of a biological factor in mixed coenosis when grain crops use lupin as a component of nitrogen accumulation and melioration of environment.
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