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Title:: Effects of StarterN plus Topdressing N on K Accumulation and Distribution in Soybean Plants

Author(s):: ?ZHANG Ming-cong; SUN Wen-xiang; LUO Xiang-yu; DONG Yan-ming; LIU Zhi-yuan; LUO Sheng-guo; ?（College of Resources and Environmental Science,Northeast Agricultural University,Harbin 150030,China）

Keywords:: Soybean; StarterN plus topdressing N; K content; K accumulation and distribution

Abstract:: ?A pot experiment was conducted to assess the effects of starterN plus topdressing N on K accumulation and distribution in soybean plants.Five treatments under the same fertilizer application rates of N 50 kg·ha^-1、P₂O₅ 40 kg·ha^-1、K₂O 50 kg·ha^-1 and different N application time were set:all N as basal fertilizer(N50),all N as topdressing at R3/R4 stage(N0+50R3/R4),N 15 kg·ha^-1as basal fertilizer and 35 kg·ha^-1as topdressing at stage R3/R4(N15+35R3/R4).
At R6 stage,compared to N50，K content and K accumulation in leaves,petioles,stems,pods increased by 21.3% and 36.0%(P<0.01),18.0% and 16.2%(P<0.01),8.24% and 10.57%(P<0.05)，4.60% and 14.1%(P<0.05)for N15+35R3,respectively,and increased by 33.6% and 42.3%(P<0.01),24.0% and 17.9%(P<0.01),17.5% and 25.6%(P<0.05),6.30%and 23.6%(P<0.05)for N15+35R4,respectively.N15+35R4 achieved the highest yield and increased yield by 30.5%(P<0.01)compared to N50,however,there was no significant difference between N15+35R4 and N15+35R3.There was a significant positive correlation between K accumulation during R4R6 stages and yield(P<0.01).Results indicated that using starterN plus topdressing N could lay a foundation for higher yield of soybean by significantly increasing K content and K accumulation in soybean organs after R5 stage.