Root Pruning and Soil Type Affect Pecan Root Regeneration

McCraw, B. Dean; Smith, Michael W.

doi:10.21273/horttech.8.4.573

Cited by 5 publications

(5 citation statements)

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“…Our data showed that root pruning shortly after germination had no effect on aboveground growth in the first year, but significantly increased the taproot branches. Additionally, similar to previously published findings (Harris et al, 2001;McCraw and Smith, 1998), the number of taproot branches increased with decreasing taproot length (Table 2). Further investigation would be required to evaluate whether these new root systems with more taproot branches would hold on or affect aboveground growth for longer periods of time.…”

Section: Discussionsupporting

confidence: 91%

“…Similar results were reported by Wood (1996) for 3-year-old seedlings, although lateral roots proliferated at the base of the severed tap root. Other researchers have reported that taproot pruning stimulates top growth, root branching, and growth during the first 2 years after transplantation (McCraw and Smith, 1998). In a 2-year study, pecan trees with a taproot that was pruned to 20 or 25 cm in length regenerated roots better and with a greater survival rate than trees pruned to a 76-cmlong taproot (Smith and Johnson, 1981).…”

Section: Discussionmentioning

confidence: 97%

“…Newly planted trees may become established promptly, may make a semblance of growth for several years and finally become established, or may fail entirely and die (Laiche, 1980). Root pruning (Harris et al, 2001;Keever et al, 1986;Laiche, 1980;McCraw and Smith, 1998;Smith and Johnson, 1981;White and Payne, 1982) and growth regulator application (Matta and Storey, 1981) can influence top growth and root branching and therefore increase transplant survival. Previous research has focused on root pruning and transplanting of 2-year-old (McCraw and Smith, 1998) or 3-year-old (Smith and Johnson, 1981;Wood, 1996) pecan trees.…”

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confidence: 99%

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Effects of Root Pruning on Germinated Pecan Seedlings

Peng¹,

Yan²,

Cao³

et al. 2015

horts

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Root systems of pecan trees are usually dominated by a single taproot with few lateral roots, which are commonly thought to inhibit successful transplanting. This study aimed to evaluate early growth and root/shoot development of pecan seedlings in response to taproot pruning. Taproots of ‘Shaoxing’ seedling pecan trees were mildly (1/3 of the total length of the radicle removed) and severely (2/3 of the total length of the radicle removed) pruned at different seedling development stages shortly after germination. At the end of the first growing season, top growth was measured and then trees were uprooted so that root system regrowth could be evaluated. The results showed that root pruning had no impact on increases in stem height or stem diameter. However, pruning the taproot could stimulate primary growth in taproot branches. Root weight and the number of taproot branches per tree increased with decreasing taproot length. This study indicated that severe root pruning when three to five leaves had emerged resulted in root systems with more taproot branches and the greatest root dry weight after one growth season, which may increase survival and reduce transplanting shock.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 97%

mentioning

confidence: 99%

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Effects of Root Pruning on Germinated Pecan Seedlings

Peng¹,

Yan²,

Cao³

et al. 2015

horts

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“…The soil was well drained, with a depth to the water table of more than 80 inches. Tree roots on all trees were trimmed to 18 inches using cutting shears to fit into the augured hole without twisting roots (McCraw and Smith, 1998;Smith and Johnson, 1981 were assigned to one of three pruning treatments in a completely randomized design: 0%, 50%, and 75% pruning of above-ground height. After pruning, mean tree height was 136, 68, and 34 inches for the 0%, 50%, and 75% treatments, respectively.…”

Section: Methodsmentioning

confidence: 99%

Effects of Pruning at Planting on Pecan Trunk Development and Total Shoot Growth

Ouédraogo

Brorsen

Biermacher

et al. 2020

hortte

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Pecan (Carya illinoinensis) trees were pruned using varying intensities at planting to determine the effect of pruning on trunk development and shoot growth. Data on trunk diameter, number and length of shoots, as well as the total shoot growth were recorded annually from a completely randomized design experiment that assigned 0%, 50%, and 75% pruning of above-ground height to single-trunk transplants. The results suggest that pruning intensity has little effect on trunk diameter. The pruned trees had fewer shoots initially and more growth per shoot, leading to a difference of 7 cm/shoot higher for the 50% pruning group than the control group and to a difference of 11 cm/shoot higher for the 75% pruning group compared with the control group. The total length of all shoots was not significantly different across treatments. Because previous research has sometimes shown that pruning increases tree survival and this research shows that trees can recover from pruning, there is no need to change the current recommendation of pruning seedlings at planting.

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“…Little information exists on the morphology of seedlings of Carya spp., other than C. illinoinensis, and on effects of root pruning on seedling shoot and root morphology of hickories. Often, investigations on the effects of root pruning with coarsely rooted species focus on seedlings past their first year of growth (McCraw and Smith, 1998) without considering modification of seedling root morphology through root pruning shortly after seed germination. Furthermore, there has not been any investigation of the effects IBA may have on lateral root branching of any Carya species.…”

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confidence: 99%

Root Pruning and Auxin Alter Root Morphology of Hickories

Miller¹,

Graves²

2019

horts

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A reputation for coarse root systems with dominant taproots, and for slow shoot development among seedlings, limits use of hickory species (Carya Nutt.) that could increase diversity in managed landscapes. We examined effects of root pruning and application of auxin on root and shoot development of seedlings of several species of hickory. Our hypothesis was that pruning the radicle shortly after seed germination and subsequent treatment with auxin would increase root branching without curtailing development of the shoot. Germinated seeds of Carya aquatica (F. Michx.) Nutt., Carya cordiformis (Wangenh.) K. Koch, Carya laciniosa (F. Michx.) Loudon, Carya ovata (Mill.) K. Koch, and Carya tomentosa (Lam.) Nutt. were treated by removing two-thirds of the length of the radicle with and without immediate application of 3000 mg·L−1 indole-3-butyric acid (IBA) via Hormex rooting powder #3 to the remaining one-third of radicle. Neither treatment altered stem height, stem caliper, or root dry weight. After 75 days, root-pruned seedlings of Carya ovata without auxin had 42% fewer fibrous first-order lateral roots than did unpruned controls. Root pruning plus auxin led to a 79% increase in the number of fibrous first-order lateral roots of C. laciniosa and an ≈50% increase in the shoot dry weight of C. aquatica. Both root pruning and root pruning plus auxin evoked formation of taproot branches for all species. Because species differed in responses of root and shoot systems to root pruning with and without auxin, the practice should be implemented cautiously based on the species.

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Root Pruning and Soil Type Affect Pecan Root Regeneration

Cited by 5 publications

References 0 publications

Effects of Root Pruning on Germinated Pecan Seedlings

Effects of Root Pruning on Germinated Pecan Seedlings

Effects of Pruning at Planting on Pecan Trunk Development and Total Shoot Growth

Root Pruning and Auxin Alter Root Morphology of Hickories

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