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Analysis of the metering performance for typical shape maize seeds using DEM

International Journal of Agricultural and Biological Engineering 2023年第1期16卷 26-35页

作者： Linrong Shi Wuyun Zhao Wei Sun Xiaoping Yang Guanping Wang Shanglong Xin College of Mechanical and Electrical Engineering Gansu Agricultural UniversityLanzhou 730070China

The irregular shape,varying internal compositions,and uneven distributions of maize seeds can degrade the metering performance of maize *** study investigates the effect of irregular maize on the performance of a high-filling-rate seed metering device using *** results show that the seed population in the seed box formed large and small cycles of seed transport due to the disturbances caused by the three *** increasing angular speed of the three wheels reduced the rate of seed filling in the seed filling regions by gravity and *** addition,an analysis of the repose angle formed by the dropped seed indicated that the angular speed of the taking seed wheel has a certain *** large angular speed reduced the coefficient of variation of the seed drop *** repose angle of the horse tooth seed was greater than those of the ***,the irregular maize seed can also reduce the coefficient of variation of the seed drop location.A comparison between the simulation and experiment results indicates the number of metering seed were basically the same.

关键词： maize seeds seed metering performance DEM verification

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Design and parameter optimization of air-suction wheel type of seedmetering device with elastic pad for maize

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International Journal of Agricultural and Biological Engineering 2024年第4期17卷 116-127页

作者： Yuhuan Sun Junhai Guo Linrong Shi College of Mechanical and Electrical Engineering Gansu Agricultural UniversityLanzhou 730070China College of Mechanical and Electrical Engineering Lanzhou University of TechnologyLanzhou 730070China

Due to the maize growing agronomy requires ground covered by mulch film in the arid zones of the China Northwest region,the seed-metering device must roll over,break the film,and then throw seeds into ***,the uneven ground can cause the seed-metering device to shake,reducing seed-metering *** improve the adaptability for different shapes of maize seeds,a air suction wheel type seed-metering device with elastic pad was developed for better seed extraction and bump ***,the advantages and influencing factors of the elastic pad were analyzed through four processes of metering ***,the velocity distributions of six diameters of the suction hole are compared to determine the range with ***,a one-factor experiment was conducted to analyze the pattern of the factors(the seed layer height,the critical vacuum,the rotational speed of the seed disk,and the suction hole diameter)influencing the metering seed ***,a five-level quadratic rotation orthogonal design was used to optimize the *** show that the optimal values are that the seed layer height is 40 mm,and the critical vacuum is 2.85 kPa,and the rotational speed of the seed disk is 20.1 r/*** validation experiment resulted in a 93.79%qualified index,with a 4.02%missing index and a 2.19%multiple index.

关键词： maize seeds seed-metering device with air suction elastic suction parameter optimization

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Effect of Different Plant Growth Promoting Rhizobacteria on maize Seed Germination and Seedling Development

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American Journal of Plant Sciences 2013年第5期4卷 1013-1021页

作者： Pacome A.Noumavo Eméric Kochoni Yédéou O.Didagbé Adolphe Adjanohoun Marcellin Allagbé Rachidatou Sikirou Emma W.Gachomo Simeon O.Kotchoni Lamine Baba-Moussa Laboratoire de Biologie et de Typage Moléculaire en Microbiologie Département de Biochimie et de Biologie CellulaireUniversitéd’Abomey-CalaviCotonouBénin Centre de Recherches Agri-coles Sud Institut National des Recherches Agricoles du BéninAttogonBénin Laboratoire de Défense des Cultures Centre de Recherches Agricoles d’AgonkanmeyInstitut National des Re-cherches Agricoles du BéninCotonouBénin Department of Biology The State University of New JerseyCamdenUSA Center for Computational and Integrative Biology The State University of New JerseyCamdenUSA

Our study aimed at assessing the effects of 3 Plants Growth Promoting Rhizobacteria (PGPR) either singly or in combination on maize growth under laboratory and greenhouse conditions. seeds were inoculated with single and combined solution of 108 CFU/ml of Rhizobacteria. seeds were not inoculated for the control variant. The highest germination percentage was obtained with the combination of Pseudomonas fluorescens and Pseudomonas putida. This combination also recorded the best vigor index, plants circumferences number of leaves and the leaf area. The maximal heights of plants were observed with seeds treated with Azospirillum lipoferum with an increase of 37.32%. The highest rates of underground dry matter were recorded with A. lipoferum, with an increase of more than 56% comparative to control, while the combination P. fluorescens and P. putida increased the aerial dry matter of 59.11%. Finally, the highest value of the aerial biomass was obtained with the plants treated with the combination of P. fluorescens and P. putida and the highest underground biomass was obtained with plants treated only with A. lipoferum. These results suggest that specific combinations of PGPR can be considered as efficient alternative biofertilizers to promote maize seed germination, biomass and crop yield.

关键词： Azospirillum Pseudomonas PGPR Biofertlization maize seeds Germination Greenhouse

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Study on Cadmium Tolerance Differences of Seed Germination and Seedlings in Different Varieties of maize

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Agricultural Science & Technology 2017年第9期18卷 1615-1618页

作者： Yang YANG Yanyan CHEN Guiyuan MENG Jing ZHOU College of Agriculture and Biotechnology Hunan University of HumanitiesScience and Technology Collaborative Innovation Center for Farmland Weeds Control Technology and Application in Hunan Province

To ascertain the genotypic difference of cadmium tolerance of different varieties of maize, effects of cadmium stress on the germination rate, germination index, vigor index, root length and fresh weight, and shoot length and fresh weight of seeds of 12 main varieties of maize widely cultivated in central Hunan were studied. The results showed that the cadmium stress had small impact on the germination rate and germination index of maize seeds, but it had obvious effects on the vigor index, root and shoot growth of maize seeds, and the inhibition effects on the roots were more obvious than the shoots. Among the 12 varieties of maize, Qiandan 12, Dushiliren, Nuobatianxia and Nongda 3138 were tolerant to cadmium stress, while Tianguan 218 was sensitive to cadmium stress, and the tolerance of other varieties of maize to cadmium stress was moderate.

关键词： maize seeds Germination Seedling growth Cadmium tolerance

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