Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (8): 1347-1357.DOI: 10.3969/j.issn.1004-1524.2021.08.01

• Crop Science • Previous Articles     Next Articles

Effects of potassium application rate on chlorophyll fluorescence characteristics and yield of spring maize in Ningxia under integrated drip irrigation

WANG Jia(), MU Ruirui, YANG Qiaoqiao, LIU Wei, ZHANG Yuehe, KANG Jianhong*()   

  1. School of Agriculture, Ningxia University, Yinchuan 750021, China
  • Received:2021-06-12 Online:2021-08-25 Published:2021-08-27
  • Contact: KANG Jianhong

Abstract:

Through two-year field experiments in 2018-2019, the effects of different potassium application rates on the chlorophyll fluorescence characteristics and yield of Ningxia spring maize were studied. Using Tianci 19 as the test material, a random block test design was adopted, with six gradient potassium fertilizer treatments, K0 (0 kg·hm-2), K1 (60 kg·hm-2), K2 (120 kg·hm-2), K3 (180 kg·hm-2), K4 (240 kg·hm-2), K5 (300 kg·hm-2).The results showed that potassium fertilizer can enhance the fluorescence characteristics of maize and increase the yield of spring maize in Ningxia. When potassium was applied at 180 kg·hm-2, SPAD, maximum fluorescence(Fm), potential activity of PSⅡ(Fv/Fo), the primary maximum photochemical efficiency of PSⅡ(Fv/Fm), PSⅡcomprehensive performance index(PI), light energy absorbed by unit reaction center (ABS/RC) and other indicators all reached the optimum. In the range of 0-180 kg·hm-2, the yield of maize increased with the increase of potassium application. When the amount of potassium application exceeded 180 kg·hm-2, the yield of spring maize began to decline.Correlation analysis showed that the yield was related to SPAD, Fm, minimum fluorescence (Fo), Fv/Fo, Fv/Fm, PI, ABS/RC, which showed different degrees of positive correlation. Therefore, the best application amount of potassium was 180 kg·hm -2.

Key words: maize, chlorophyll content, chlorophyll fluorescence parameters, yield

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