Effects of Different Nitrogen Application Rates through Pointer Sprinkler on Yield and Nitrogen Uptake of Oats
In order to explore the effects of nitrogen reduction under pointer sprinkler on yield and nitrogen absorption of oats(Avena sativa)in Horqin Sandy Land,'Leader 2'oats was taken as test material,and three nitrogen application gradients were set including 60% N(216 kg·ha-1),80% N(288 kg·ha-1),and 100% N(360 kg·ha-1).The plant height,aboveground biomass,nitrogen content,and soil inorganic nitrogen during the whole growth period of oats were measured,and nitrogen absorption and surplus were calculated.We aimed to evaluate the effects of different nitrogen application rates on yield and nitrogen uptake of Oats.The results showed that at the jointing stage of oats,60% N showed the minimum plant height(P<0.05);at the heading,filling,and maturity stages of oats,plant height showed a decreasing trend with the increase of nitro-gen fertilizer amount.The dry grass yield of feed oats under 80% N and 100% N was significantly higher than that under 60% (P<0.05),no change between 80% N and 100% N,indicating that reducing nitrogen by 20% could stabilize oats yield.At 0～20 cm and 60～80 cm,soil inorganic nitrogen content was higher at 100% N than 60% N(P<0.05);the nitrogen surplus of 100% N was significantly higher than that of 80% N and 60% N.In conclusion,in Horqin Sandy Land,288 kg·hm-2(80% N,20% nitrogen reduction)is the best nitrogen application rate for oat production.This study provided reference for improving oat yield and efficient utilization of nitrogen nutrition.
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维普
