Abstract
Tillage intensity and planting density are closely related to rice growth and its yield, in order to understand the comprehensive effects of them on rice, such field experiment was made. Before the experiment, conventional tillage (one-time plowing and one-time rotary tillage) was used for the experimental paddy fields for long term. In the experimental years of 2019 and 2020, three tillage intensities and planting densities were designed. The tillage treatments were no tillage, reduced tillage (only one-time rotary tillage), and conventional tillage, and the three designed planting densities had the same number of planting pit (166,667 pits/ha, the distance between adjacent planting pits is 30 cm and 20 cm), and different number of transplanted seedling each pit which was 2 seedlings (D1), 5 seedlings (D2), and 8 seedlings (D3). The filed experimental results showed that under no tillage there was the highest value in rice yield, spike density, spikelets per panicle, 1000-grain weight, net photosynthetic rate (Pn), chlorophyll content, leaf area index (LAI), and above-ground biomass; compared with reduced tillage (or conventional tillage), no tillage increased rice yield by 7.35% (22.07%) and rice spike density by 5.09%(10.08%), increasing the number of transplanted seedling per planting pit to D2 from D1 significantly increased the spikes density, LAI, and above-ground biomass, while did not decrease significantly the spikelets per panicle, Pn, and chlorophyll content; meanwhile, the number of transplanted seedling per planting pit increased to D3 from D2, the above growth indicators did not increase significantly, and the correspondingly photosynthetic indexes decreased significantly; compared with D1(D3), D2 increased rice yield by 3.74% (6.99%). Obviously, it is an effective way for stable and high yield of rice to optimize planting density and tillage intensity.
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We acknowledge the supported by the National Key R & D Program (2016YFD0300907-05).
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HWZ conducted experiments and wrote and revised the manuscript; SCJ conducted experiments and wrote the manuscript; JQZ conceived and designed research; QXW and QSZ analyzed data, BD helped and processed the ultrastructural pictures. All authors read and approved the manuscript.
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Zhang, H., Jiang, S., Du, B. et al. Tillage Intensity and Planting Density Significantly Affected Photosynthesis, Growth, and Yield of Rice. J Plant Growth Regul 42, 2662–2671 (2023). https://doi.org/10.1007/s00344-022-10735-w
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DOI: https://doi.org/10.1007/s00344-022-10735-w