Influence of nitrogen stress on nitrate accumulation and yield of lettuce varieties

Relevance. Many authors note the existence of significant genotypic differences in assimilation nitrogen and accumulation nitrates by lettuce, point to additive-dominant nature inheritance trait. The aim work was evaluate response lettuce various cultivars mineral nutrition stress created against a nitrogen-deficient background (N0) with an increased dose (N 200 ). Material Methods . In microfield experiment on well-cultivated soddy-podzolic soil, collection varieties belonging main cultivated variety types studied. differed geographical origin, early maturity morphological characteristics. Results. Differences yield between N200 were 4.5 times, N0 – 5.7 times. Against nutrition, highest 2.22-2.64 kg/m 2 formed following varieties: All Year, Quedlinburger Dickkopf, Berlin Yellow, Great lakes. background, Azart Odessa Kucheryavets stood out terms yield, which absorbed soil better than others. content plants different varied more strongly when grown N ranged from 10.7 13.6 times (on average over years 11,2 times), control 0 33 Varieties accumulating maximum NO3 under conditions excess revealed. Lettuce Romaine (Lactuca romana) 353 mg/kg White paris cus (198 mg/kg) had low NO 3 period increase biomass also corresponded decrease plants. Power function equations calculated estimate rate change content. results indicate that there may be some scope for reduction through cultivar selection or breeding.