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Effects of nitrogen and phosphorus interaction on the tuber yield and its quality of Jerusalem artichoke.

SUN Xiao-e, MENG Xian-fa, LIU Zhao-pu, LONG Xiao-hua**   

  1. (College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)
  • Online:2013-02-10 Published:2013-02-10

Abstract: In order to understand the effects of fertilizers interaction on the growth of Jerusalem artichoke, a field experiment with orthogonal design was conducted to study the effects of nitrogen (N), phosphorus (P), and their interaction on the tuber yield and its quality of J. artichoke “Nanyu No. 1”. Both N and P had significant effects on the tuber yield, its dry matter content, and total sugar, reducing sugar, and inulin contents (P<0.01). N and P interaction had significant effects on the tuber yield and its dry matter and reducing sugar contents (P<0.05), and extremely significant effects on the tuber’s total sugar and inulin contents (P<0.01). When the P fertilization rate was 135 kg P2O5·hm-2, its interaction with N was positive (synergistic) when the N fertilization rate was less than 180 kg·hm-2, but negative (antagonistic) when the N fertilization rate was above 180 kg·hm-2. When the N fertilization rate was 180 kg·hm-2 and the P fertilization rate was 135 kg P2O5·hm-2, the interactive effect of N and P increased, with the tuber yield and its dry matter, total sugar, reducing sugar, and inulin contents being the highest. Above all, the optimal basis fertilization for J. artichoke in Laizhou City of Shandong Province, East China would be 180 kg·hm-2 of N and 135 kg·hm-2 of P2O5.