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3 基于叶片干物质建立的临界氮浓度曲线得到的RY与NNI和AND的关系 V3、V6、V8、V12、VT和R6分别代表玉米的三叶期、六叶期(拔节期)、八叶期、十二叶期(大喇叭口期)、抽雄期和完熟期。SD: 陕单609; ZD: 正大12; “△”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. 3 Relationships between relative yield (RY) and the nitrogen nutrition index (NNI), relative yield (RY) and the accumulated nitrogen deficit (AND) of two maize hybrids with varied N rates on the base of leaf dry matter N dilution curves V3, V6, V8, V12, VT and R6 represent the third, sixth, eighth, twelfth leaf stages, tasseling and physiological maturity stages, respectively. SD: Shaandan 609; ZD: Zhengda 12; Shaandan 609 is marked by “△”, Zhengda 12 is marked by “◇”; “──” means the curves of Shandan 609, “……” means the curves of Zhengda 12. ** indicates significant difference at P < 0.01.