The effect of bacterial products and mineral fertilizers on growth and productivity of Brassica juncea Czern

¹ Herzen State Pedagogical University of Russia, 48, Moika Emb., Saint Petersburg, 191186, Russia
² Emperor Alexander I St. Petersburg State Transport University, 9, Moskovsky Ave., Saint Petersburg, 190031, Russia
³ Saint-Petersburg State Agrarian University, 2, Peterburgskoye Highway, Pushkin, Saint Petersburg , 196601, Russia

^* Corresponding author: antares-80@yandex.ru

Abstract

The paper reports the results of field experiments that analyzed changes in growth indicators and productivity of Sarepta mustard (Brassica juncea Czern.) of the Start variety (k-4259) in response to inoculation and increasing doses of mineral nitrogen. Morphometric parameters and productivity of dry mass were measured during the stage of harvesting maturity, i.e., the full flowering stage. The seeds were inoculated with the following bacterial products: Agrofil (Agrobacterium radiobacter, strain 10), Mizorin (Arthrobacter mysorens, strain 7), Mobilin (Pseudomonas fluorescens, strain PG-5), and Flavobakterin (Flavobacterium sp., strain 30). The amount of nitrogen ranged from N30 to N120. It was enhanced with the application of PK at the rate of 60 kg/ha. The experiments showed that the application of bacterial products and increasing doses of mineral nitrogen has a stimulating effect on plants. The fertilizer formulation N120P60K60 and rhizobacteria strains Flavobacterium sp., strain 30, and Pseudomonas fluorescens, strain PG-5, proved to be the most effective. The obtained data were roughly consistent with the application of N₉₀ and N₁₂₀. The use of mineral fertilizers resulted in the highest productivity of dry shoot mass.