Substrates With Slow Release Nitrogen and Potassium Organic Fertilizers

Nowosielski, O.; Struszczyk, H.; Beresniewicz, A.

doi:10.17660/actahortic.1984.150.23

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“…Nitrogen and ammonia contents of both substrates varied, even at the same sampling date, possibly due to bacterial activity during the experiment and the substrate fertilizer amendments (nitrogen‐phosphate‐potassium [N‐P‐K] mixes) added as slow‐release beads by commercial producers of plant substrates (Boyer et al., ; Jackson & Wright, ; Nowosielski, Struszczyk, & Beresniewicz, ). Nitrogen content in substrates containing F. verticillioides apparently increased with time.…”

Section: Discussionmentioning

confidence: 99%

Survival of Phytophthora cinnamomi and Fusarium verticillioides in commercial potting substrates for ornamental plants

Puértolas

Boa

Bonants³

et al. 2018

Journal of Phytopathology

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Live plants, particularly when accompanied by soil or potting substrates, are considered the main pathway for international spread of plant pathogens. Modern, rapid shipping technologies for international plant trade increase the probability of plant pathogen survival during transport and the subsequent chances of disease outbreaks in new locations. The survival of two model pathogens, an Oomycete, Phytophthora cinnamomi, and a filamentous fungus, Fusarium verticillioides, was studied in two different commercial potting substrates (peat and peat‐free) under glasshouse conditions in the absence of a plant host. Survival rates were analysed at 2, 7, 12 and 17 months after substrate inoculation. Fusarium verticillioides had the longest survival rate, and was still present at 17 months. In contrast, P. cinnamomi survived up to 7 months but was not recovered after 12 or 17 months. There was no significant difference in the number of colony‐forming units (CFUs) of either pathogen in the two substrates, except at 2 months, when higher numbers were recovered from peat substrates.

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Section: Discussionmentioning

confidence: 99%