The fungus-specificity of mycorrhization helper bacteria (MHBs) used as an alternative to soil fumigation for ectomycorrhizal inoculation of bare-root Douglas-fir planting stocks with Laccaria laccata

1993 ◽  
Vol 157 (2) ◽  
pp. 257-262 ◽  
Author(s):  
R. Duponnois ◽  
J. Garbaye ◽  
D. Bouchard ◽  
J. L. Churin
Keyword(s):  
Douglas Fir ◽  
Soil Fumigation ◽  
Laccaria Laccata ◽  
Mycorrhization Helper Bacteria ◽  
Bare Root

Effects of application rate and cold soaking pretreatment of Pisolithus spores on effectiveness as nursery inoculum on western conifers

1983 ◽  
Vol 13 (3) ◽  
pp. 533-537 ◽  
Author(s):  
Isabel F. Alvarez ◽  
James M. Trappe
Keyword(s):  
Ponderosa Pine ◽  
Application Rate ◽  
Douglas Fir ◽  
Application Rates ◽  
White Fir ◽  
Mycorrhiza Formation ◽  
Bare Root

Ponderosa pine (Pinusponderosa Dougl. ex Laws.), Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco), Shasta red (Abiesmagnified var. shastensis Lemm.), and white fir (Abiesconcolor (Gord. & Glend.) Lindl. ex Hild.) seedlings were inoculated in a bare root nursery with basidiospores of Pisolithustinctorius (Pers.) Coker & Couch. The spores were applied at three rates with or without cold–wet pretreatment of 7 or 21 days. Pretreatment did not affect spore efficiency as inoculum. Only ponderosa pine responded to inoculation. Inoculations in the greenhouse with a wider range of spore application rates revealed that a higher concentration of spores was needed to induce an increase in growth and mycorrhiza formation of Douglas-fir than ponderosa pine. These levels were much higher than those used in nursery inoculations.

scholarly journals High NO3-N to NH4-N Ratios Promote Growth and Flowering of a Hybrid Phalaenopsis Grown in Two Root Substrates

HortScience ◽  
2008 ◽  
Vol 43 (2) ◽  
pp. 350-353 ◽  
Author(s):  
Yin-Tung Wang
Keyword(s):  
Douglas Fir ◽  
Leaf Length ◽  
Sphagnum Moss ◽  
Total N ◽  
Plant Leaf ◽  
Whole Plant ◽  
Flower Stem ◽  
Flower Diameter ◽  
Bare Root ◽  
Inflorescence Length

Young, bare-root plants (three leaves, 15 cm in leaf spread) from a vegetatively propagated clone of Phalaenopsis Blume x Taisuco Kochdian were imported in late May and planted in a mix consisting of three parts medium-grade Douglas fir bark and one part each of perlite and coarse peat (by volume) or in pure Chilean sphagnum moss. All plants were given 221 N, 124 P, 515 K, 100 Ca, and 50 Mg (all in mg·L−1) when being irrigated. The total N varied from 0%, 25%, 50%, 75%, to 100% NO3-N with the balance being NH4-N. Plants were fertigated when the substrate became dry. For both substrates, as the percentage of NO3-N increased, plants produced slightly fewer leaves. Regardless of the NO3-N to NH4-N ratio, plants grown in moss produced one extra leaf than those planted in the bark mix during an 8-month period. There was a tendency of increasing top leaf length and width as well as the whole-plant leaf spread as NO3-N increased from 0% to 100% in either substrate. Plants receiving 50% or more NO3-N in either substrate spiked and flowered 2 weeks earlier than those given 25% or 0% NO3-N. When grown in the bark mix, flower count, flower diameter, and inflorescence length all increased as NO3-N increased from 0% to 75%. Flower stem (inflorescence, 5 cm from the base) became progressively thicker as NO3-N increased from 0% to 100%. Only two among the 24 plants grown in moss and receiving 100% NH4-N bloomed. These results suggest that Phalaenopsis does not grow well with 100% NH4-N and must be provided with NO3-N at no less than 50%, preferably 75%, of the total N for improved growth and flowering.

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