Effectiveness of mineral fertilizer application in oilseed flax (Linum usitatissimum L.) cultivation under different soil preparation technologies

A three-year comparative study was conducted on the effectiveness of applying mineral nitrogen-phosphorus fertilizers in the cultivation of oilseed flax, variety 'Kustanai Amber', on calcareous southern chernozem in the conditions of Shortandy District, Akmola Region. The study was carried out under two soil preparation technologies – traditional and zero tillage – in a fourfield crop rotation. It was established that traditional tillage in the first two years ensured more intensive consumption of nitrate nitrogen and an advantage in the accumulation of dry biomass, especially in control variants and during early plant development phases. Under zero tillage, a trend towards greater retention of nitrates in the soil at harvest and higher variability of growth indicators was observed. By the third year, differences in biomass accumulation and yield between the technologies in variants with optimized mineral nutrition were statistically leveled out. In the zero technology, with local row application of phosphorus (P20) combined with nitrogen (including based on leaf diagnostics), the yield reached 15.8-16.2 c/ha, which is compa-rable to the indicators of the traditional technology (16.5-17.9 c/ha).

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