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Urban Composts as an Alternative for Peat in Forestry Nursery Growing Media

机译：城市堆肥作为林业苗圃生长介质中泥炭的替代品

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Including urban composts in nursery growing media could reduce peat use and promote new markets for these products. The objective of this work was to study the effects of compost incorporation in forestry nursery growing media. Growing media were prepared mixing composts (0-75% in volume) from biosolids, municipal solid waste and pruning waste with peat. As control treatment, a peat-based substrate was employed. Hydrophysical and chemical properties of growing media were determined. Moreover the effects of these growing media on rosemary and cypress plant growth (height, stem diameter, nutrient contents) in propagation and production trials were monitored. Hydrophysical properties of compost based growing media were adequate up to 50% compost. The Carbon/Nitrogen ratio of composts (10.7-12.4) was indicative of compost maturity. Compost EC values frequently surpasses those of standard peat substrates, therefore substrate salinity limited the maximum percentage of compost in substrates. In the case of cutting propagati'on, rosemary growth was increased to 50% compost (EC 1.1-1.3 dS m~(-1)). Cypress seed germination was not affected until 75% compost (EC 1.4-1.9 dS m~(-1)) and its growth was increased in all compost growing media. Plant growth increased was related to the fertilizing effect of compost. Although composts content of Ni, Zn, and Pb were greater than those of standard peat substrates, only concentration of Zn was greater in compost-media cultivated plants. As a general rule, forestry nursery growing media could incorporate up to 50% composts from biosolids, municipal solid waste and pruning wastes mixed with peat.
机译：在育苗场中使用城市堆肥，可以减少泥炭的使用并促进这些产品的新市场。这项工作的目的是研究堆肥掺入林业苗圃生长培养基的效果。制备生长培养基，将生物固体，城市固体废物和修剪的泥炭与泥炭混合，制成堆肥（体积为0-75％）。作为对照处理，使用了基于泥炭的基材。确定了生长介质的水物理和化学性质。此外，还监测了这些生长介质在繁殖和生产试验中对迷迭香和柏树植物生长（高度，茎直径，营养成分）的影响。基于堆肥的生长培养基的水物理特性足以满足50％的堆肥要求。堆肥的碳/氮比（10.7-12.4）表明堆肥成熟。堆肥的EC值通常超过标准泥炭基质的值，因此基质盐度限制了堆肥在基质中的最大百分比。在减少繁殖的情况下，迷迭香的生长量增加到堆肥的50％（EC 1.1-1.3 dS m〜（-1））。直到75％堆肥（EC 1.4-1.9 dS m〜（-1）），柏树种子的发芽才受到影响，并且在所有堆肥生长培养基中其生长均得到提高。植物生长的增加与堆肥的施肥效果有关。尽管Ni，Zn和Pb的堆肥含量高于标准泥炭基质，但在以堆肥为培养基的栽培植物中，仅Zn的浓度更高。作为一般规则，林业苗圃生长培养基最多可以掺入生物固体，城市固体废物和修剪废物与泥炭混合的50％堆肥。

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