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Research ArticleArticles

Effect of Nursery Production Method and Planting Techniques on Tree Establishment in Urban Sites: Preliminary Results

F. Ferrini, F.P. Nicese, S. Mancuso and A. Giuntoli
Arboriculture & Urban Forestry (AUF) September 2000, 26 (5) 281-284; DOI: https://doi.org/10.48044/joa.2000.26.5.281
F. Ferrini
1Associate Professor of Ornamental Horticulture, Associate Professor of Ornamental Horticulture Dipartimento di Produzione Vegetale University of Milan, Via Celoria, 2 – 20133 Milano, Italy,
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  • For correspondence: [email protected]
F.P. Nicese
2Assistant Professor, Dipartimento di Ortoflorofrutticoltura University of Florence, Via Donizetti, 6 – 5014 Florence, Italy
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S. Mancuso
3Research Assistant, Dipartimento di Ortoflorofrutticoltura University of Florence, Via Donizetti, 6 – 5014 Florence, Italy
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A. Giuntoli
4Unità Operativa Verde Pubblico - Zone 5, City of Florence, V.le Corsica 34/b, Florence, Italy
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In recent years, nurserymen have become increasingly aware of the advantages offered by container-grown nursery stock, especially when planting time is limited, when planting during the growing season, or when transplanting to adverse sites. Nursery production techniques can influence plant performance and initial maintenance practices (Gilman 1994) but, while many production methods have been recently developed (Appleton 1995), only a few comparisons have been made on post-transplant growth (Arnold 1994; Gilman and Beeson 1996). Moreover, the results often are contradictory because of varied protocols and their interactions with the physiological condition of the trees at the time of transplanting, climate, microclimate, soil characteristics, and post-transplant care—factors that seldom are consistent among experiments.

Some authors report that container-grown plants frequently establish poorly when moved to the landscape (Costello and Paul 1975; Gilman 1994), while others found no differences in establishment among different production methods, including balled-and-burlapped (B&B) and plastic containers. Gilman (1994) states that trees from a variety of production systems perform almost equally well if regularly irrigated. Thus, water stress after transplanting is the most limiting factor for plant growth and probably the major factor responsible for planting failure (Watson and Himelick 1998).

Numerous cultural practices have been developed to aid establishment. Use of soil amendments to improve backfill soil structure and aeration are common practices, especially in the urban environment (Rose and Smith 1997). However, some research projects showed that amendments may not be beneficial (Watson and Himelick 1998) and could in fact be detrimental.

Among the different soil amendments, composted organic waste material (compost) has shown potential benefits both for soil structure and plant growth (Rose 1997). It is, however, of paramount importance that compost be stable before use.

As to the nonconventional sources of organic matter suitable for soil amendments, different humic-acid-derived materials have improved soil characteristics and plant growth (Obreza and Biggs 1989). The application of leonardite, an oxidized form of lignitic coal (marketed as a humus-based commercial preparation), has increased shoot growth, ion adsorption and accumulation, root growth, and the number of lateral roots produced on some vegetable crops (Duval et al. 1998). However, little research on their use in urban plantings has been done.

The purpose of this study was to evaluate the effects of two different nursery production methods and backfill compositions on tree performance after transplanting in the urban landscape.

MATERIALS AND METHODS

Plant Material

In March 1998, 24 uniform, five-year-old, 4- to 4.5-m-tall (13 to 15 ft), 12- to 14-cm-circumference (5 to 6 in.), balled-and-burlapped, grafted English oak (Quercus robur L.) cv ‘Select’ trees were planted in a public park in Florence, Italy An additional 24 Airplant® container-grown trees with identical size characteristics were obtained from the same nursery and planted at the same time. The Airplant is a new type of container, suitable for a medium- to large-sized tree cultivation, recently developed by Piante Mati (Pistoia, Italy). Its design is supposed to induce roots to grow downward into the center of the container, an area usually less colonized by roots. This downward growth results in a better root system, with fewer circling and kinking roots and with intact root tips (Fiorino et al. 1998).

Until late 1970s, the park was used as a rubble dump to fill the depression left after the draining of ponds. When filled, the rubble was covered with a 80- to 100-cm-deep (approximately 3 ft) layer of clay soil. Planting holes were two times the width and 1.5 times the depth of the root ball. Trees were placed in the planting holes and backfilled with 1) excavated soil with 50% of high-quality compost obtained through aerobic biostabilization of selected organic residues; 2) excavated soil + leonardite, 2 kg of the commercial product Humisol; or 3) excavated soil + Nitrophoska blu Spezial, 1 kg (12-12-12 with magnesium, sulfur, and some microelements). Holes backfilled with excavated soil were used as the control.

Six single-plant replicates of two production methods and four with the backfilling material were planted in a completely randomized design. Trees were watered, and some soil was added to compensate for settling. Trees were irrigated once a week during spring and summer 1998 with 40 to 50 L (11 to 13 gal) per plant.

Data Collection

From budbreak (April) to the end of June (when no further shoot elongation was detected), shoot length was determined biweekly on 20 shoots per plant. Trunk diameter was measured at planting and the following winter at 30 and 120 cm (12 to 47 in.) from the ground. Leaf area was calculated by measuring the area of 50 leaves per plant with a CID CI-203 leaf area meter (CID Inc., Vancouver, WA). Instantaneous net photosynthesis (Pn), transpiration rate (E), and water use efficiency (WUE, calculated by dividing Pn by E) were measured 100 and 123 days after planting, using the ADC-LCA-2 portable infrared gas analyzer. The readings were taken 17 June and 10 July between 800 and 1100 hours on five fully expanded leaves (chosen from the outer part of the crown and at different heights) per plant under conditions of light saturation (PAR > 1,000 μmol−2 s−1).

Data Analysis

Data were analyzed using the multifactor analysis of variance (production method × backfill soil) using SPSS (Release 8.0 for Windows 95). Treatment means were separated by LSD, with an α ≤ 0.05 level of significance.

RESULTS AND DISCUSSION

Results indicate that shoot growth was statistically higher in the B&B plants than in plants produced in the Airplant system. The authors feel that reduced growth of Airplant material might be the result of increased drought stress susceptibility even when irrigated once a week (Table 1). Trees that received compost grew significantly better than trees backfilled with leonardite (Table 2). Leaf area was significantly higher in the Airplant trees and in the fertilization treatment than in compost-added and control trees. No interactions were found between backfill × plant production systems.

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Table 1.

Leaf area (LA), shoot length, net photosynthesis (Pn), and water use efficiency (WUE) of English oak (Quercus robur ‘Select’) as affected by different nursery production methods.

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Table 2.

Leaf area (LA), shoot length, net photosynthesis (Pn), and water use efficiency (WUE) of English oak (Quercus robur ‘Select’) as affected by different planting-hole backfill mixes.

No statistical differences were detected in photosynthesis among the different treatments (Table 1 and Table 2). Balled-and-burlapped trees used water more efficiently than did the Airplant trees (Table 1). Compost addition to backfill increased WUE. The presence of compost in the planting hole might have increased the water-holding capacity of the backfill, thus allowing plants to prolong shoot extension in spite of high temperatures and no rain following transplanting.

Results of this experiment are to be considered preliminary. Further research is needed both to confirm these results and to understand the long-term effects of the different plantinghole backfill mixes on soil chemical and physical properties and on tree physiology.

Acknowledgments

The authors contributed in equal measure to this paper. The authors wish to thank Paolo Conti for his contribution and technical assistance.

  • Copyright © 2000, International Society of Arboriculture. All rights reserved.

LITERATURE CITED

  1. ↵
    1. Appleton, B.L.
    1995. Nursery production method for improving tree roots. J. Arboric. 21:265–269.
    OpenUrl
  2. ↵
    1. Neely, D., and
    2. G.W. Watson
    1. Arnold, M.A.
    1994. Transplanting experiments: What worked and what did not, pp 34-45. In The Landscape Below Ground: Proceedings of an International Workshop on Tree Root Development in Urban Soils. Neely, D., and G.W. Watson (Ed.). International Society of Arboriculture, Champaign, IL. 222 pp.
  3. ↵
    1. Costello, L.,
    2. J.L. Paul
    . 1975. Moisture relation in container plants. HortScience 19:371–372.
    OpenUrl
  4. ↵
    1. Duval, J.R.,
    2. F.J. Dainello,
    3. V.A. Haby,
    4. D.R. Earhart
    . 1998. Evaluating leonardite as a crop growth enhancer for turnip and mustard green. HortTechnology 8(4):564–567.
    OpenUrl
  5. ↵
    1. Fiorino, P.,
    2. F.P. Nicese,
    3. M. Mingrone, and
    4. L. Riva
    . 1998. Effect of different type of container on nursery-grown European hornbeam (Carpinus betulus ‘Pyramidalis’). Atti IV Giornate Scientifiche SOI, San Remo, Italy, 1-3 April, pp 199–200.
  6. ↵
    1. Neely, D., and
    2. G.W. Watson
    1. Gilman, E.F.
    1994. Establishing trees in the landscape, pp 69-77. In The Landscape Below Ground: Proceedings of an International Workshop on Tree Root Development in Urban Soils. Neely, D., and G.W. Watson (Ed.). International Society of Arboriculture, Champaign, IL. 222 pp.
  7. ↵
    1. Gilman, E.F., and
    2. R.C. Bison, Jr.
    1996. Production method affects tree establishment in the landscape. J. Environ. Hortic. 14(2):81–86.
    OpenUrl
  8. ↵
    1. Obreza, T.A., and
    2. R.H. Biggs
    , 1989. Humate materials: Their effects and use as soil amendments. Citrus Indus. 10.
  9. ↵
    1. Rose, M.A.
    1997. Saving the soil. Am. Nurseryman April 1:87–89.
    OpenUrl
  10. ↵
    1. Rose, M.A., and
    2. E. Smith
    . 1997. Preparation and planting of landscape plants. Ohio State Univ. Ext. Fact., HYG 1014–97.
  11. ↵
    1. Watson, G., and
    2. G. Himelick
    . 1998. The planting basics. Am. Nurseryman May 15:40–44.
    OpenUrl
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Arboriculture & Urban Forestry (AUF): 26 (5)
Arboriculture & Urban Forestry (AUF)
Vol. 26, Issue 5
September 2000
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Effect of Nursery Production Method and Planting Techniques on Tree Establishment in Urban Sites: Preliminary Results
F. Ferrini, F.P. Nicese, S. Mancuso, A. Giuntoli
Arboriculture & Urban Forestry (AUF) Sep 2000, 26 (5) 281-284; DOI: 10.48044/joa.2000.26.5.281

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Effect of Nursery Production Method and Planting Techniques on Tree Establishment in Urban Sites: Preliminary Results
F. Ferrini, F.P. Nicese, S. Mancuso, A. Giuntoli
Arboriculture & Urban Forestry (AUF) Sep 2000, 26 (5) 281-284; DOI: 10.48044/joa.2000.26.5.281
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