Efficiency of distributed application of nitrogen on onion (<i>Allium cepa</i> L.) cultivated as an annual crop

Rele v ance. Onions in Russia 2021: Cultivation area – 56.3 thousand hectares; Productivity 28.6 t/ha; Production 1608.6 tons; Import from the volume of consumption 10.7%. Modern varieties and hybrids plant protection products make it possible to obtain high yields conditions Non-chernozem zone. The aim research is optimize parameters terms technological operations for cultivation onion an annual crop on alluvial meadow soils Non-Chernozem Zone. Materials methods. nutrition system plants was tested through distributed nitrogen application during growing season: Option 1 (N 160 P K ) presowing (Ca 40 N 10 + 20 season; 2 110 season. Experience use microbiological preparation Bisolbi-Plant ( Bacillus pumilis BIS88 together with 1% humic "Rostok" at a rate one liter per hectare each stimulate active growth. Results. At end season second variant experiment, extended by 7-10 days. excess yield under option 2021-22 years amounted more than 20.0 t/ha significant. difference options applying 2.8 HCP 05 8.2 not advantage biological higher density 71.0 units/ha absence signs bacteriosis. Thus, irrigation water significantly effective There tendency increase quality double (BIS88) (1.0 1.0) l/ha.