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Nodulation of Seaside Alder Topdressed with Controlled-release Fertilizer

机译:配施控释肥的海滨Al木结瘤

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摘要

Seaside alder (Alnus maritima) is a rare species adapted for ornamental use. It can be produced easily by commercial growers, and when soil-inoculated in nursery containers, will form root nodules containing nitrogen (N)-fixing bacteria in the genus Frankia. It has been demonstrated that nodulation within this species can be controlled by the amount of N plants receive from a liquid source; however, granular controlled-release fertilizers (CRF) also are commonly used by commercial growers, and information is not available on CRF effects on nodulation. We sought to determine the application rate of CRY that will maximize nodulation of seaside alder while sustaining acceptable plant health and growth. Inoculated containerized plants were topdressed with CRY at eight application rates from 0 to 32.0 g per container. A control group of uninoculated plants received the manufacturer's prescribed rate of 6.0 g per 6-inch-diameter standard round pot. Regression analysis revealed that treatment with 2.0 g of CRF maximized root nodule formation (a mean of 26 nodules), while nodulation was inhibited at CRF rates >= 4.0 g. Plant growth parameters and leaf N content of inoculated plants treated with 2.0 g of CRF were similar to those of uninoculated plants receiving the prescribed rate of CRY (P < 0.05); nitrate-nitrogen leaching from pots containing 2.0-g CRY-treated plants was minimal. We conclude that vigorous nodulated plants of seaside alder can be produced, with minimal nitrate leaching, by providing CRY at lower than prescribed rates.
机译:海边al木(Alnus maritima)是一种稀有物种,适合观赏。它可以由商业种植者轻松生产,并且在苗圃容器中接种土壤后,会在Frankia属中形成含有固氮菌的根瘤。已经证明,该物种内的结瘤可以通过从液体源接收到的N种植物的数量来控制。但是,商业种植者也普遍使用颗粒控释肥料(CRF),并且尚无关于CRF对结瘤的影响的信息。我们试图确定CRY的施用率,该剂量将在维持可接受的植物健康和生长的同时最大程度地节制海边al木。接种的容器化植物以0至32.0 g /容器的八种施用量施以CRY追肥。对照组的未接种植物接受制造商规定的每6英寸直径标准圆罐6.0 g的剂量。回归分析表明,用2.0 g CRF进行处理可最大程度地增加根瘤形成(平均26个结节),而在CRF速率> = 4.0 g时可抑制结节。用2.0 g CRF处理的接种植物的植物生长参数和叶片氮含量与未接受规定CRY速率的未接种植物相似(P <0.05)。从装有2.0 g CRY处理过的植物的花盆中浸出的硝酸盐氮极少。我们得出的结论是,通过以低于规定的速率提供CRY,可以生产出具有活力的具结节性的海滨al木植物,且硝酸盐的淋失最少。

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