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| Effects of fertilization on the growth and physiological characteristics of rice under different shading conditions |
| Received:March 16, 2021 |
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| KeyWord:shading;compound fertilizer;silicate supply;rice;photosynthesis |
| Author Name | Affiliation | E-mail | | LIU Yingxia | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | LOU Yunsheng | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | yunshlou@163.com | | WANG Kun | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | XING Yuyuan | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | LIU Jian | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | SU Lei | Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China | sulei@igge.cn | | TANG Liling | Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China | |
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| Abstract: |
| The weakening of solar radiation is one of the main issues associated with global climate change. It is of great practical importance to understand the effect of weakening solar radiation on rice production, and to explore whether fertilization can mitigate the depressive effects of weaker solar radiation on plant growth and physiological metabolism in rice. A field simulation experiment was performed to investigate the effects of compound fertilizer supply and silicate fertilization on the growth and photosynthetic physiological of rice. A black shading net was used to cover the plant canopy to simulate the weakened solar radiation. An orthogonal experimental design was adopted with three factors and three levels. Shading was set at three levels:no shading(S0, 0% shading rate), shading from flowering to maturity(S1, 64% shading rate), and shading from tillering to maturity(S2, 64% shading rate). NPK compound fertilizer was supplied at three levels:100(F1), 200 kg×hm-2(F2), and 300 kg×hm-2(F3), and silicate fertilization was also set at three levels:no silicate fertilizer (R0), slag fertilizer 200 kg×hm-2(R1), and slag fertilizer 400 kg×hm-2(R2). The results showed that shading decreased plant height, leaf area index(LAI), intercellular CO2 concentration(Ci), and yield of rice. Compared with S0, the yields in the S1 and S2 treatments decreased by 43.99% and 54.24%, respectively. S1 increased tiller numbers, net photosynthetic rate(Pn), stomatal conductance(Gs), and transpiration rate(Tr), but decreased the SPAD value. S2 increased SAPD value and Tr, but decreased tiller numbers, Pn, and Gs compared to S0, while the NPK compound fertilizer supply increased plant height, tiller number, SPAD value, Pn, and Tr, but decreased Ci and Gs. Compared with F1, F2 decreased LAI by 10.13% and F3 increased LAI by 12.13%. Compared with F2, F3 increased plant height, tiller numbers, SPAD value, and Pn(by 1.28%, 8.21%, 4.16%, and 7.64%, respectively), and decreased Tr(0.64%), whereas silicate fertilization increased plant height, tiller numbers, LAI, Pn, Tr, and Gs, but decreased the SPAD value and Ci. Compared with R0, R1 decreased plant height and tiller numbers(1.27% and 5.00%, respectively), while R2 increased plant height and tiller numbers(0.50% and 13.77%, respectively). This study suggests that under reduced solar radiation, applying 300 kg·hm-2 of compound fertilizer and 400 kg· hm-2 of steel slag silicate fertilizer not only ensured higher yield but also clearly mitigated the depressive effects of decreased solar radiation on plant growth and physiological metabolism in rice. |
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