Effects of nitrogen application system and intercrop-ping on oat nitrogen uptake and soil nitrogen
[Objective]The objective was to study the impacts of different nitrogen application systems on oat ab-sorption and soil nitrogen accumulation in an oat/pea intercropping system.[Method]A randomized block design was employed.Four nitrogen application systems were tested:N0(no N),N1(20%base fertilizer +20%tillering stage +60%topdressing stage),N2(20%base fertilizer +30%tillering stage +50%topdressing stage),and N3(20%base fertilizer +40%tillering stage +40%topdressing stage).Three cropping modes(oat/pea intercrop-ping,oat monoculture and pea monoculture)were studied to assess the effects of nitrogen application regimes on oat nitrogen uptake and soil nitrogen.[Result]The study found that nitrogen application and intercropping significantly influenced oat grain yield,nitrogen uptake and soil nitrogen.Intercropped oat had the highest grain yield under the N2 treatment,which was 22.48%higher than that under N3.Oat nitrogen uptake intercropping under N2 treatment was the highest(71.2 kg/hm2),49.9%higher than that of N0.During the growth stages,oat nitrogen uptake increased by 26.5%,15.8%,7.3%and 17.1%at jointing stage,heading stage,filling stage and maturity stage,respectively,compared with that of monoculture oat.Soil total nitrogen content in the 0～20 cm soil layer increased by 12.9%,11.2%,15.4%and 6.9%under N0,N1,N2 and N3 treatments,respectively,compared with monoculture.Inter-cropped oats exhibited higher soil nitrate nitrogen and ammonium nitrogen than monoculture oats during various growth stages.[Conclusion]In the 20～40 cm soil layer,intercropped oats showed higher total nitrogen and nitrate ni-trogen content than monoculture oat.Ammonium nitrogen content decreased,although the difference not significant.
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