Perner Henrike, Schwarz Dietmar, Bruns Christian, Mäder Paul, George Eckhard
Leibniz-Institute of Vegetable and Ornamental Crops, Theodor-Echtermeyer-Weg 1, 14979, Großbeeren, Germany.
Plant Nutrition, Institute of Crop Sciences, Humboldt University of Berlin, Berlin, Germany.
Mycorrhiza. 2007 Jul;17(5):469-474. doi: 10.1007/s00572-007-0116-7. Epub 2007 Feb 22.
Two challenges frequently encountered in the production of ornamental plants in organic horticulture are: (1) the rate of mineralization of phosphorus (P) and nitrogen (N) from organic fertilizers can be too slow to meet the high nutrient demand of young plants, and (2) the exclusive use of peat as a substrate for pot-based plant culture is discouraged in organic production systems. In this situation, the use of beneficial soil microorganisms in combination with high quality compost substrates can contribute to adequate plant growth and flower development. In this study, we examined possible alternatives to highly soluble fertilizers and pure peat substrates using pelargonium (Pelargonium peltatum L'Her.) as a test plant. Plants were grown on a peat-based substrate with two rates of compost addition and with and without arbuscular mycorrhizal (AM) fungi. Inoculation with three different commercial AM inocula resulted in colonization rates of up to 36% of the total root length, whereas non-inoculated plants remained free of root colonization. Increasing the rate of compost addition increased shoot dry weight and shoot nutrient concentrations, but the supply of compost did not always completely meet plant nutrient demand. Mycorrhizal colonization increased the number of buds and flowers, as well as shoot P and potassium (K) concentrations, but did not significantly affect shoot dry matter or shoot N concentration. We conclude that addition of compost in combination with mycorrhizal inoculation can improve nutrient status and flower development of plants grown on peat-based substrates.
（1）有机肥料中磷（P）和氮（N）的矿化速率可能过慢，无法满足幼嫩植物对养分的高需求；（2）在有机生产系统中，不鼓励单独使用泥炭作为盆栽植物栽培的基质。在这种情况下，将有益土壤微生物与优质堆肥基质结合使用有助于植物的充分生长和花朵发育。在本研究中，我们以天竺葵（Pelargonium peltatum L'Her.）作为试验植物，研究了高溶解性肥料和纯泥炭基质的可能替代物。植物种植在添加了两种堆肥量的泥炭基基质上，有或没有接种丛枝菌根（AM）真菌。接种三种不同的商业AM接种剂后，菌根定殖率高达总根长的36%，而未接种的植物根系未出现定殖。增加堆肥添加量可提高地上部干重和地上部养分浓度，但堆肥供应并不总能完全满足植物的养分需求。菌根定殖增加了芽和花的数量，以及地上部P和钾（K）的浓度，但对地上部干物质或地上部N浓度没有显著影响。我们得出结论，添加堆肥并接种菌根可以改善种植在泥炭基基质上植物的养分状况和花朵发育。
