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Effects of Different Potassium (K) Fertilizer Rates on Yield Formation and Lodging of Rice

Tantan Zhang1,2,#, Xiaoping He3,#, Binglin Chen1,#, Longxin He1,2, Xiangru Tang1,2,*
1 State Key Laboratory for conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China
2 Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture, Guangzhou, 510642, China
3 Guangdong Tianhe Agricultural Materials Co., Ltd., Guangzhou, 510642, China
* Corresponding Author: Xiangru Tang. Email:
# These authors contributed equally to the work
(This article belongs to this Special Issue: High-Yield Rice Physiology & Genetics)

Phyton-International Journal of Experimental Botany 2021, 90(3), 815-826.

Received 07 September 2020; Accepted 09 October 2020; Issue published 30 March 2021


As one of the most important nutrients for plants, potassium (K) has substantial effects on growth and development of crops. Present study was conducted in three different sites in South China in late season in 2019 with the objective to study the effects of different applied amounts of K fertilizer on yield formation and lodging of rice. Four K fertilizer treatments, K0: 0 kg potassium oxide (K2O) ha−1 (control); K1: 64.20 kg K2O ha−1 ; K2: 128.55 kg K2O ha−1 and K3 153.90 kg K2O ha−1 were applied in the field experiment. The results showed that K2 and K3 treatments significantly increased panicle number per unit area, grain number per panicle, seed-setting rate and the grain yield of rice compared with K0 treatment. Higher net photosynthetic rates were recorded in K2 and K3 treatments than K0 treatment at tillering stage, heading stage and maturity stage. K fertilizer treatments also increased the chlorophyll content and dry matter accumulation by 6.16–23.52% and 21.32–64.59% compared with K0 treatment, respectively. Moreover, the total N and K accumulation in the aboveground tissues of rice significantly increased under K2 and K3 treatments compared with K0 treatment. Furthermore, compared with K0 treatment, K fertilizer treatments significantly enhanced the breaking-resistant strength by 40.94–144.24% and reduced the lodging index of rice by 13.14–36.72%.


Lodging; net photosynthetic rate; potassium; rice; SPAD value

Cite This Article

Zhang, T., He, X., Chen, B., He, L., Tang, X. (2021). Effects of Different Potassium (K) Fertilizer Rates on Yield Formation and Lodging of Rice. Phyton-International Journal of Experimental Botany, 90(3), 815–826.

This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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