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Acta Agronomica Sinica ›› 2023, Vol. 49 ›› Issue (5): 1339-1349.doi: 10.3724/SP.J.1006.2023.22031

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Panicle silicon fertilizer optimizes the absorption and distribution of mineral elements in rice (Oryza sativa L.) in coastal saline-alkali soil to improve salt tolerance

WEI Hai-Min1,2(), TAO Wei-Ke1,2, ZHOU Yan1,2, YAN Fei-Yu1,2, LI Wei-Wei1,2, DING Yan-Feng1,2, LIU Zheng-Hui1,2, LI Gang-Hua1,2,*()   

  1. 1Key Laboratory of Crop Physiology Ecology and Production Management, Ministry of Agriculture and Rural Affairs, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China
    2Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China.
  • Received:2022-05-13 Accepted:2022-10-10 Online:2023-05-12 Published:2022-11-15
  • Contact: *E-mail: lgh@njau.edu.cn
  • Supported by:
    Key Research and Development Program of Jiangsu Province(BE2021361);Key Research and Development Program of Jiangsu Province(BE2019377)

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Abstract:

This purpose of this study is to elucidate the mechanism of silicon fertilizer on mineral element distribution at heading stage in rice. In this study, a field experiment was carried out in the coastal beach saline-alkali of Jiangsu Province (3.4 g kg-1 soil salinity, pH 8.3). The conventional japonica rice (Huaidao 5) was used as the material, and three silicon fertilizer amounts (0, 60 and 100 kg hm-2) were applied with panicle fertilizer at panicle initiation stage. The results showed that: (1) Silicon panicle fertilizer promoted plant nutrient absorption at heading stage, increased dry matter accumulation at mature stage, and increased yield, Si60 increased by 4.3% on average, Si100 increased by 8.6% on average. (2) Silicon panicle fertilizer optimized the distribution of K+ and Na+ in rice at heading stage. Silicon increase K+ content in leaves, upper sheaths and lower stems of rice, decreased Na+ content in panicles, upper leaves, sheaths and stems, and increased the K+/Na+ ratio in various tissues, thus improving ion homeostasis of rice. (3) Silicon panicle fertilizer promoted the accumulation of N, P, Ca, Mg, Fe, and Mn in leaves. Compare with Si0, the average increase of the two silicon treatments was 16.5% in P, 18.5% in Mg, 22.4% in Ca and 19.8% in Fe, and alleviated the adverse effects of saline-alkali stress on rice leaves. In summary, silicon panicle fertilizer optimizes the absorption and distribution of mineral elements in rice, reduced salt stress in young organs, promoted the accumulation of beneficial elements in leaves, improved nutrient absorption of rice, and the effect of 100 kg hm?2 was better.

Key words: rice, saline-alkali stress, silicon, mineral elements, rice yield

Fig. 1

Effects of silicon panicle fertilizer on dry matter accumulation and yield of rice in saline alkali soil A, B: dry matter accumulation; C, D: rice yield. Data represent means ± SDs, n = 3. Different letters indicate significant differences among the different treatments at P < 0.05 according to Duncan’s multiple range test."

Fig. 2

Effects of silicon panicle fertilizer on K+ content in different organs of rice in saline alkali soil K+ content in different part of the organs (A, B), leaves (C, F), sheaths (D, G), and stems (E, H). Data represent means ± SDs, n = 3. Different letters indicate significant differences among the different treatments at the same organ at P < 0.05 according to Duncan’s multiple range test."

Fig. 3

Effects of silicon panicle fertilizer on Na+ content in different organs of rice in saline alkali soil Treatments are the same as those given in Fig. 2. Data represent means ± SDs, n = 3. Different letters indicate significant differences among the different treatments at the same organ at P < 0.05 according to Duncan’s multiple range test."

Fig. 4

Effects of silicon panicle fertilizer on K+/Na+ ratio in different organs of rice in saline alkali soil Treatments are the same as those given in Fig. 2. Data represent means ± SDs, n = 3. Different letters indicate significant differences among different treatments at the same organ according to Duncan’s multiple range test at P < 0.05."

Fig. 5

Effects of silicon panicle fertilizer on content of N, P, Ca, and Mg in different organs of rice in saline alkali soil The content of different organs in N (A, B), P (C, D), Ca (E, F), Mg (G, H). Data represent means ± SD, n = 3. Different letters indicate significant differences among different treatments at the same organ at P < 0.05 according to Duncan’s multiple range test."

Fig. 6

Effects of silicon panicle fertilizer on content of Fe, Mn, Zn, and Cu in different organs of rice in saline alkali soil The content of different organs in Fe (A, B), Mn (C, D), Zn (E, F), and Cu (G, H). Data represent means ± SDs, n = 3. Different letters indicate significant differences among different treatments at the same organ at P < 0.05 according to Duncan’s multiple range test."

Fig. 7

Schematic diagram of effect of silicon panicle fertilizer on distribution of mineral elements of rice in salt stress A: salt stress; B: salt stress + silicon. The picture shows the distribution ratio of K+ and Na+ in different leaves, and the change of mineral elements content in different organs. The deeper the leaf color was, the higher the Na+ content was. The lighter the leaf color was, the higher the K+/Na+ ratio was, and the lower the salt stress was."

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