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2 用2016-2017年获得的数据验证Nc稀释曲线 符号(○)和(×)分别代表2016年和2017年的不受氮素限制值和受氮素限制值。a、b和c实线分别代表陕单609的叶片、茎和植株的Nc稀释曲线, d、e和f实线分别代表正大12的叶片、茎和植株的Nc稀释曲线。两侧的虚线代表最小和最大的曲线, 用2014-2015年不受氮素限制值(△)和受氮素限制值(◇)获得。Nmin和Nmax为氮浓度最小和最大值; LDM: 叶片干物质; SDM: 茎干物质; PDM: 植株干物质。** 表示在P < 0.01水平上显著。

Fig. 2 Validation of the N c dilution curve using data from experiments performed from 2016 to 2017 The symbols (○) and (×) represent non-N-limiting and N-limiting values from 2016 to 2017, respectively. The solid curved lines a, b, and c represent the Nc dilution curves of the leaf, stem, and plant of Shandan 609, respectively, and the solid curved lines d, e, and f represent the Nc dilution curves of the leaf, stem, and plant of Zhengda 12, respectively. The dotted lines on either side represent the curves for the minimum limits, which are developed using data from N-limiting (◇) and non-N-limiting (△) treatments from 2014 to 2015. Nmin and Nmax are minimum and maximum of nitrogen concentration; LDM: leaf dry matter basis; SDM: stem dry matter basis, PDM: plant dry matter. ** indicates significant difference at P < 0.01.