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SYSTEMIC PHYTOSANITARY ROLE OF SPRING WHEAT PREDECESSORS IN THE SOUTHERN FOREST STEPPE OF NOVOSIBIRSK REGION

Abstract

The aim of our study was to assess the complex phytosanitary activity of spring wheat predecessors against root rot pathogens and weed seeds as well as their effect on improving soil microflora diversity and attracting useful entomofauna to agrocenoses of the southern forest steppe in Novosibirsk Region. Investigations were carried out in Krasnozersky District of Novosibirsk Region in 2011-2013. Predecessors (fallow, yellow sweet clover, spring wheat) improved the phytosanitary condition of soil by decreasing population densities of phytopathogens - agents of common root rots. Biological effectiveness of sweet clover in purifying soil from phytopathogens averaged 35.5 percent across yearst, that of fallow 41.8 percent, from weed seeds 2 and 5.2 times, respectively. The stimulating effect of predecessors on microbial activity of soil and entomophage populations was found out. Depression of root rots development by sweet clover during the growing season was 16-69 percent, by fallow 11-34 percent towards the end of the growing season. Spring wheat yield after phytosanitary predecessors was 1.4-1.7 times higher as compared with continuous growing.

About the Authors

E. YU. Toropova
Novosibirsk State Agrarian University
Russian Federation


S. N. Posazhennikov
Close Corporation “Kolybelskoye”
Russian Federation


E. YU. Marmuleva
Novosibirsk State Agrarian University
Russian Federation


References

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Review

For citations:


Toropova E.Yu., Posazhennikov S.N., Marmuleva E.Yu. SYSTEMIC PHYTOSANITARY ROLE OF SPRING WHEAT PREDECESSORS IN THE SOUTHERN FOREST STEPPE OF NOVOSIBIRSK REGION. Siberian Herald of Agricultural Science. 2014;(4):5-11. (In Russ.)

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ISSN 0370-8799 (Print)
ISSN 2658-462X (Online)