Assessment of catalase soil activity under amaranth cultivation not exposed to chemical protection methods

The aim of the study was to determine influence habitat, cultivar and developmental growth stage on catalase activity in soil under two amaranth cultivars – Rawa (Amaranthus cruentus L.) Aztek hypochondriacus × Amaranthus hybridus L.). In a 3-year field experiment (2013–2015), amaranth’s plants were grown wide-row spacing good wheat complex south-eastern Poland (50°71'N, 23°04'E). included 4 variable factors: weather conditions; selected stages (5-leaf, full flowering seed maturity stages); NPK dose combinations (I: 40 kg N ∙ ha–1, 30 P K ha–1; II: 60 III: 80 50 IV: 120 70 ha–1) (‘Rawa’ ‘Aztek’). No pesticides are applied cultivation due absence pathogens pests this plant Poland. Plant protection limited reducing weed infestation twice. conducted research showed that conditions main factor affecting cultivation, followed by other factors, such as fertilization, stage. All analyzed factors proved exert significant impact organic matter content soil, while only fertilization had effect sorption capacity. Moreover, it found cv. positively influenced humus accumulation comparison Rawa. beneficial environment its enzymatic ascribed lack introduced pesticides.