Hodge Simon, Merfield Charles N, Liu Wendy Y Y, Tan Heng W
The BHU Future Farming Centre, Lincoln 7640, Canterbury, New Zealand.
Faculty of Agricultural Sciences, Lincoln University, Lincoln 7647, Canterbury, New Zealand.
Plants (Basel). 2021 Mar 30;10(4):660. doi: 10.3390/plants10040660.
Organically-derived biofertilizers and biostimulants, developed from harvested materials such as seaweed and waste from animal and fish processing, are currently the subject of much fundamental and applied research. These products have significant potential in reducing synthetic fertilizer inputs to horticultural, arable, and pasture-based agricultural systems, although there is frequently some ambiguity over the magnitude and consistency of any positive effects these products may have on plant performance. This study examined the effects of organically-derived plant growth promoters (PGPs) available in New Zealand on the early vegetative growth of 16 plant species maintained under glasshouse conditions. When applied as a root drench to low nutrient potting mix, the effects of the PGPs on seedling shoot growth were strongly related to the NPK contents of the applied solutions. Any positive effects on shoot growth were, on average, reduced when the seedlings were maintained in higher nutrient growing media. Applying the PGPs at concentrations twice, and four times, the recommended concentration, only caused further growth responses when the PGPs contained high levels of nutrients. Applying the PGPs as a foliar spray had negligible effects on shoot growth. Overall, the results of these trials suggest that the positive effects of applying some organically-derived PGPs on seedling growth are a function of the PGP nutrient content, and not due to any indirect effects related to phytohormone pathways or modification of rhizosphere microorganisms.
以海藻、动物及鱼类加工废弃物等收获物为原料开发的有机源生物肥料和生物刺激剂，目前是许多基础研究和应用研究的主题。这些产品在减少园艺、耕地和牧场型农业系统中合成肥料投入方面具有巨大潜力，尽管这些产品对植物生长可能产生的任何积极影响的程度和一致性常常存在一些模糊性。本研究考察了新西兰现有的有机源植物生长促进剂（PGP）对温室条件下16种植物早期营养生长的影响。当作为根灌施用于低养分盆栽混合料时，PGP对幼苗地上部生长的影响与施用溶液中的氮磷钾含量密切相关。当幼苗在养分含量较高的生长介质中培养时，对地上部生长的任何积极影响平均都会降低。当PGP含有高水平养分时，以推荐浓度的两倍和四倍施用PGP，才会引起进一步的生长反应。将PGP作为叶面喷施对地上部生长的影响可忽略不计。总体而言，这些试验结果表明，施用一些有机源PGP对幼苗生长的积极影响是PGP养分含量的作用，而非与植物激素途径或根际微生物变化相关的任何间接影响所致。
