高速气送集排器水稻种子损伤规律及发芽试验
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国家重点研发计划项目(2021YFD2000405)


Damage patterns and germination experiments of rice seeds using high-speed air-assisted centralized seed metering device
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    摘要:

    针对高速播种(≥12km/h)过程中,水稻种子受气送式集排器的多次压缩和冲击作用易导致种子破损影响发芽率的问题,基于损伤累积理论开展了水稻种子在单次及多次机械压缩作用下损伤规律的研究。首先,开展单次压缩试验,建立了适用于水稻种子的弹塑性模型;进一步,开展多次等位移压缩试验,确定水稻种子在多次压缩作用下产生损伤的临界形变量,并进行种子发芽率试验验证损伤临界形变量的正确性;最后,基于能量守恒定律和种子冲击损伤特性与压缩特性关联模型明确了气送式集排系统高速排种时作业参数匹配范围。水稻种子单次压缩试验结果表明:常规稻和杂交稻种子单次压缩破碎力分别为(118.4±35.6)、(113.2±39.9)N,破碎时形变量分别为(0.59±0.07)、(0.63±0.11) mm,弹塑性平均临界形变量分别为0.4、0.44 mm。水稻种子多次压缩试验及发芽率验证试验结果表明:杂交稻种子产生损伤的临界形变量为0.44 mm,当籽粒压缩形变量大于0.44 mm时,受多次循环压缩后水稻种子的发芽率下降。在气送式集排系统作业参数匹配过程中,应避免水稻种子受载后产生的形变量大于0.44 mm,经计算,搅种装置转速范围应低于125 r/min、种子在气流冲击作用下运移速度应低于8.5 m/s以减少集排器对水稻种子的损伤。本研究可为水稻高速播种时作业参数匹配提供理论依据和参数范围。

    Abstract:

    Multiple compression and impact of the air-assisted centralized seed metering device on rice seeds during high-speed sowing (≥12km/h) can easily lead to seed damage and adversely affects the emergence rate. This study aims to explore the damage of rice seeds under single and multiple mechanical compression in the air-assisted centralized seed metering device, according to the damage accumulation theory. The fitting equations of seed impact damage and compression were clarified to determine the matching range of stirring speed and the conveying airflow parameters during high-speed seeding. A systematic analysis was also implemented to explore where the seed was damaged under the repeated compression by the seed mixing device during high-speed seeding. The multiple impacts of airflow were evaluated during transportation and distribution in the air-assisted centralized seed metering device. The single compression test was carried out on the hybrid rice and conventional rice varieties. An elastic-plastic model was constructed suitable for rice seeds, in order to determine the critical value of elastic-plastic deformation. The multiple equal displacement compression tests were then carried out to determine the process of damage to rice seeds under multiple compressions. The critical deformation of rice seeds was determined and verified to combine with the seed germination rate test under multiple compressions. According to the conservation of energy, the critical speed was constructed at which the rice seeds were compressed and damaged by the stirring device. The fitting equation of impact damage and compression was combined to analyze the speed of seed airflow impact damage. The results showed that the crushing forces of conventional and hybrid rice seeds under single compression were (118.4±35.6) N and (113.2±39.9) N, respectively, the deformation during crushing was (0.59±0.07) mm and (0.63±0.11) mm, respectively, and the average critical deformation of elastic plasticity was 0.4 and 0.44 mm, respectively. In multiple compression tests, the maximum compression force of the seeds remained consistent, when the compression distance was less than the elastic-plastic average critical deformation; Once the compression distance was greater than the critical elastoplastic deformation, the maximum compressive force on the seed decreased gradually. Verification tests were also performed on the rice seeds germination rate. There was the a 0.44 mm critical deformation of hybrid rice seeds that caused damage. When the deformation of compressed seeds was less than 0.44 mm, there was no significant difference in the germination rate between compressed and uncompressed seeds after multiple compressions; When the compression deformation of the seeds was greater than 0.44 mm, the germination rate of rice seeds decreased after multiple cycles of compression. Therefore, the deformation of rice seeds after being loaded should be avoided to be greater than 0.44 mm. After that, the rotation speed range of the stirring device should be lower than 125 r/min and the seed transport speed should be lower than 8.5 m/s, in order to reduce the compression and impact damage of the air-assisted centralized seed metering device on rice seeds. This finding can provide a theoretical basis and parameter range to match the operating parameters during rice high-speed sowing.

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李晓冉,廖庆喜,杜文斌,刘智博,汪晓东,廖宜涛,袁佳诚.高速气送集排器水稻种子损伤规律及发芽试验[J].农业工程学报,2024,40(21):46-55. DOI:10.11975/j. issn.1002-6819.202406072

LI Xiaoran, LIAO Qingxi, DU Wenbin, LIU Zhibo, WANG Xiaodong, LIAO Yitao, YUAN Jiacheng. Damage patterns and germination experiments of rice seeds using high-speed air-assisted centralized seed metering device[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2024,40(21):46-55. DOI:10.11975/j. issn.1002-6819.202406072

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  • 收稿日期:2024-06-12
  • 最后修改日期:2024-08-25
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  • 在线发布日期: 2024-11-01
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