夏玉米不同部位干物质临界氮浓度稀释曲线的构建及对产量的估计

苏文楠, 解君, 韩娟, 刘铁宁, 韩清芳

Construction of critical nitrogen dilution curve based on dry matter in diffe rent organs of summer maize and estimation of grain yield

SU Wen-Nan, XIE Jun, HAN Juan, LIU Tie-Ning, HAN Qing-Fang

图1 基于叶片、茎和植株干物质建立的2个玉米品种临界氮浓度稀释曲线的差异比较 SD: 陕单609; ZD: 正大12; Nc: 地上部氮浓度的临界值; LDM: 叶片干物质; SDM: 茎干物质; PDM: 植株干物质。“○”表示品种陕单609, “●”表示品种正大12; “──”表示品种陕单609, “- - -”表示品种正大12。** 表示在P < 0.01水平上显著。

Fig. 1 Comparison of critical N dilution curves of two maize hybrids on different bases (leaf dry matter basis, stem dry matter basis, and plant dry matter basis) with varied nitrogen rates SD: Shaandan 609; ZD: Zhengda 12; Nc: critical value of shoot nitrogen concentration; LDM: leaf dry matter basis; SDM: stem dry matter basis; PDM: plant dry matter. Shaandan 609 is marked by “○”, Zhengda 12 is marked by “●”; “──” means the curves of Shaandan 609, “- - -” means the curves of Zhengda 12. ** indicates significant difference at P < 0.01.