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Horticultural evaluation of zein-based bioplastic containers

机译:玉米蛋白基生物塑料容器的园艺评估

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摘要

Environmental problems caused by petroleum-based plastics have led to interest in alternatives made from biodegradable polymers (bioplastics), but little effort has been made to evaluate horticultural containers made from these materials. Containers were fabricated from polymers of the corn (Zea mays L.) protein, zein. My first objective was to determine the longevity of zein-based containers under conditions typical of horticultural production. Zein containers of two wall thicknesses were filled with either a peat-based, soilless potting substrate or coarse perlite, and they were irrigated every 2 or 4 days. After 10 weeks, weight loss of containers was determined as a measure of their degradation. Containers filled with the peat-based soilless substrate lost nearly twice as much weight as containers filled with perlite, and irrigation every 4 days led to greater weight loss than irrigation every 2 days. In another experiment, to simulate the potential practice of installing plants in the landscape without container removal, bioplastic containers of two sidewall thicknesses were filled with the soilless potting substrate and planted in either drained or saturated field soil, and the two substrates were either sterilized (autoclaved) or nonsterilized. After 12 weeks, containers in drained soils had greater weight loss than containers in saturated soils regardless of substrate sterilization treatment. My second objective was to test the hypothesis that biodegradation of zein-based containers provides nitrogen (N) that promotes growth of geranium (Pelargonium xhortorum L.H. Bail.). Zein containers provided root zones up to 298 and 277 mg·kg-1 NH4+-N and NO3--N, respectively. Unlike plants in conventional plastic containers, leaves of geraniums in zein containers remained dark green when produced without fertilization. Electrical conductivity (EC) and pH of substrate in zein containers increased above ranges recommended for many horticultural crops, and NO2-, which can be toxic to plants, was present in the substrate of zein containers. These chemical changes seem responsible for reduced canopy height and width, leaf area, root system length, and shoot dry weights of geraniums in zein containers compared with geraniums in conventional plastic containers. My third objective was to determine if geraniums grown in zein containers could be transplanted and reestablished successfully with the container intact, thus eliminating the need for disposal of containers. When transplanted with zein containers intact, root and shoot growth of geraniums were reduced until after six weeks, when biodegradation of containers was nearly complete. Migration of roots through the zone of the degraded container and into surrounding substrate was observed approximately three months after transplanting. Our data show the zein-based bioplastic containers we made are suitable for crops having production cycles \u3c 3 months. Geraniums can be produced and transplanted in zein-based containers, but additional research is needed to solve problems that can result from chemical changes to the root zone during production, and from chemical and physical effects on reestablishment after transplant.
机译:由石油基塑料引起的环境问题已引起人们对由可生物降解的聚合物(生物塑料)制成的替代品的兴趣,但很少有人努力评估由这些材料制成的园艺容器。容器由玉米(Zea mays L.)蛋白质玉米醇溶蛋白的聚合物制成。我的第一个目标是确定在园艺生产中典型的玉米醇溶蛋白容器的寿命。将两个壁厚的玉米蛋白容器装满泥炭基的无土盆栽基质或粗糙的珍珠岩,然后每2或4天灌溉一次。 10周后,确定容器的重量损失以衡量其降解。装有泥炭基无土基质的容器的重量损失几乎是装有珍珠岩的容器的两倍,并且每4天浇水比每2天浇灌导致更大的重量损失。在另一个实验中,为了模拟在不移除容器的情况下将植物安装在景观中的潜在做法,将两个侧壁厚度的生物塑料容器装满无土的盆栽基质,并种植在排水或饱和的田间土壤中,并对两种基质进行灭菌(高压灭菌)或未灭菌。 12周后,无论基质灭菌处理如何,排水土壤中的容器比饱和土壤中的容器损失更大。我的第二个目标是检验以下假设,即基于玉米蛋白的容器的生物降解会提供促进天竺葵生长的氮(Pelargonium xhortorum L.H. Bail。)。玉米醇溶蛋白提供的根区分别高达298和277mg·kg-1NH4 + -N和NO3--N。与传统塑料容器中的植物不同,玉米蛋白容器中的天竺葵叶在不施肥的情况下仍保持深绿色。玉米醇溶蛋白容器中基质的电导率(EC)和pH增加到许多园艺作物推荐的范围之上,玉米醇溶蛋白容器中存在对植物有毒的NO2-。与传统塑料容器中的天竺葵相比,这些化学变化似乎可以减少玉米醇溶蛋白容器中天竺葵的冠层高度和宽度,叶面积,根系长度以及幼枝干重。我的第三个目标是确定在玉米蛋白容器中生长的天竺葵是否可以移植并在容器完好无损的情况下成功重建,从而消除了处理容器的需要。当完整植入玉米醇溶蛋白容器后,天竺葵的根和茎生长会减少,直到六周后容器的生物降解几乎完成。移植后大约三个月,观察到根部通过降解的容器区域迁移到周围的基质中。我们的数据表明,我们制造的基于玉米醇溶蛋白的生物塑料容器适用于生产周期为3个月的农作物。天竺葵可以在基于玉米醇溶蛋白的容器中生产和移植,但是还需要进一步的研究来解决可能由生产过程中根部区域的化学变化以及移植后重建产生的化学和物理影响而导致的问题。

著录项

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    Helgeson, Matthew Steven;

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  • 年度 2009
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  • 原文格式 PDF
  • 正文语种 en
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