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首页> 外文期刊>HortScience >Nutrient release from controlled-release fertilizers in a neutral-pH substrate in an outdoor environment: II. Leachate calcium, magnesium, iron, manganese, zinc, copper, and molybdenum concentrations.
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Nutrient release from controlled-release fertilizers in a neutral-pH substrate in an outdoor environment: II. Leachate calcium, magnesium, iron, manganese, zinc, copper, and molybdenum concentrations.

机译：在室外环境中，pH值为中性的基质中控释肥料的养分释放：II。渗滤液中钙，镁，铁，锰，锌，铜和钼的浓度。

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Nutrient release characteristics of four different controlled-release fertilizers (Osmocote, Nutricote, Polyon, and Multicote) were monitored during an 11-month period in a simulated outdoor nursery production facility in California, USA during 2001-02. Although no plants were used in the experiment, fertilization rates, irrigation regimes, and cultural practices simulated those typically used to produce fast-growing, high-nutrient-requiring containerized woody ornamentals. Fertilizer prill release characteristics were monitored through analyses of leachates, which were collected weekly. Concentrations of Mg, Mn, Zn, Cu, and Mo were relatively high during the first 5 to 10 weeks of the experiment, then declined and usually stabilized during the remainder of the study. However, Mn and Zn displayed erratic increases in concentrations several times throughout the study. Calcium concentrations did not increase until the fifth week, rapidly peaked to about 300 mg.L-1, and then decreased and leveled off to ~80 to 100 mg.L-1 during the remainder of the study. Several significant differences were observed between treatments. The Osmocote treatment had significantly greater Ca and Mg concentrations in the leachate than the other fertilizer types during the last 6 weeks of the study, whereas the Nutricote treatment often had significantly greater Fe concentrations than leachates from other treatments, especially during the last 26 to 35 weeks of the study, and significantly greater Zn concentrations than the other CRFs during the last 21 weeks of the study. Based upon U.S. Environmental Protection Agency guidelines, concentrations of Fe were often more than the allowable limit of 0.3 mg.L-1 with all fertilizer types, but especially with Nutricote. Concentrations of Mn and Cu also exceeded federal guidelines, particularly during the first several weeks of the study..
机译：在2001-02年期间，在美国加利福尼亚州的模拟室外苗圃生产设施中，在11个月内监测了四种不同控释肥料（Osmocote，Nutricote，Polyon和Multicote）的养分释放特征。尽管实验中未使用任何植物，但施肥率，灌溉制度和文化习俗模拟了通常用于生产快速生长，需要高养分的容器化木质观赏植物的植物。通过每周收集一次渗滤液的分析监测肥料的释放特性。在实验的前5至10周内，Mg，Mn，Zn，Cu和Mo的浓度相对较高，然后下降，并且在其余研究期间通常保持稳定。但是，在整个研究过程中，锰和锌的浓度显示出数倍的不稳定。钙的浓度直到第五周才增加，迅速达到约300 mg.L-1的峰值，然后下降，并在其余的研究中稳定在〜80至100 mg.L-1的水平。治疗之间观察到几个显着差异。在研究的最后6周内，渗透压处理的渗滤液中Ca和Mg浓度明显高于其他肥料类型，而Nutricote处理通常比其他处理的渗滤液中Fe浓度显着更高，尤其是在最近26至35年期间在研究的最后21周内，锌的浓度明显高于其他CRF。根据美国环境保护署的指导原则，所有类型的肥料，特别是营养作物，Fe的浓度通常都超过允许的上限0.3 mg.L-1。锰和铜的浓度也超过了联邦规定，特别是在研究的前几周。

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