Inter-rotational Effects of Fertilization and Weed Control on Juvenile Loblolly Pine Productivity and Nutrient Dynamics

2014 ◽  
Vol 78 (S1) ◽  
pp. S152-S167 ◽  
Author(s):  
Praveen Subedi ◽  
Eric J. Jokela ◽  
Jason G. Vogel ◽  
Timothy A. Martin
Keyword(s):  
Weed Control ◽  
Loblolly Pine ◽  
Nutrient Dynamics

Loblolly Pine (Pinus taeda) Response to Weed Control in Central Louisiana

1988 ◽  
Vol 2 (4) ◽  
pp. 490-494 ◽  
Author(s):  
James D. Haywood
Keyword(s):  
Pinus Taeda ◽  
Weed Control ◽  
Loblolly Pine ◽  
Untreated Control ◽  
Weed Biomass ◽  
Growing Seasons ◽  
The Mean ◽  
Herbaceous Weed Control

Herbaceous weed control was studied on a loblolly pine planting site in central Louisiana. Pine growth was enhanced without eradicating weeds; reducing weed biomass about 50% increased the mean inside bark volume of loblolly pine saplings 53% on the weeded treatments compared to the untreated control after five growing seasons in the field. Pines receiving both preplant weed control with glyphosate or disking and postplant weed control with a series of yearly treatments (1982, atrazine plus simazine; 1983, atrazine plus oxyfluorfen; 1984, hexazinone; and 1985, hexazinone) had 62% greater volume than pines on the preplant-only treatments. So, the best gains in loblolly pine volume required postplant weed control.

Growth of Loblolly Pine Treated With Hexazinone, Sulfometuron Methyl, and Metsulfuron Methyl For Herbaceous Weed Control

1985 ◽  
Vol 9 (1) ◽  
pp. 20-26 ◽  
Author(s):  
J. L. Michael
Keyword(s):  
Weed Control ◽  
Loblolly Pine ◽  
Control Treatment ◽  
Silty Clay ◽  
Growth Responses ◽  
Deer Browsing ◽  
Sulfometuron Methyl ◽  
Evening Primrose ◽  
Metsulfuron Methyl ◽  
Herbaceous Weed Control

Abstract Aerial application of 0.25 pounds active ingredient per acre of sulfometuron methyl [Oust(TM), formerly DPX-5648] or 2.0 pounds of hexazinone [Velpar L (TM)] postemergent in May 1982, resulted in good weed control. Weeds controlled on the silty clay coastal plain soil included pokeweed (Phytolacca americana L.), ragweed (Ambrosia sp.), goldenrod (Solidago sp.), and evening primrose (Oenothera sp.). Growth of 1-year-old loblolly pine (Pinus taeda L.) seedlings released with sulfometuron methyl or hexazinone was significantly improved in comparison to untreated seedlings. No significant pine mortality was associated with either treatment. On similar sites where blackberry (Rubus sp.), honeysuckle (Lonicera japonica Thunberg), and herbaceous weeds are the major problem, application of sulfometuron methyl from pre-emergence to the postemergent stage (when weeds are up to 12 to 18 inches in height) is recommended. Hexazinone is recommended as a postemergent treatment for herbaceous weed control. Treatment with metsulfuron methyl (formerly DPX-T6376-21) did not result in any growth responses significantly greater than untreated seedlings. Impacts of deer browsing on seedlings resulted in a slight height reduction the first and second growing seasons following planting but by the end of the third growing season browsed seedlings had made up the difference. No diameter differences were associated with deer browsing at any time during the study.

Effects of ontogeny and soil nutrient supply on production, allocation, and leaf area efficiency in loblolly and slash pine stands

2000 ◽  
Vol 30 (10) ◽  
pp. 1511-1524 ◽  
Author(s):  
Eric J Jokela ◽  
Timothy A Martin
Keyword(s):  
Leaf Area ◽  
Weed Control ◽  
Loblolly Pine ◽  
Aboveground Biomass ◽  
Soil Nutrient ◽  
Growth Efficiency ◽  
Pinus Elliottii ◽  
Nutrient Supply ◽  
Slash Pine ◽  
Growth Responses

The effects of ontogeny and soil nutrient supply on aboveground biomass accumulation, allocation, and stemwood growth efficiency of loblolly (Pinus taeda L.) and slash pine (Pinus elliottii Engelm. var. elliottii) were investigated in north-central Florida over 16 years using a 2 × 2 × 2 factorial experiment (species, fertilization, weed control). Aboveground biomass growth responses to the combined fertilizer and weed control treatments (FW) averaged ~2- and 2.8-fold for slash and loblolly pine, respectively. In the same treatment, annual needlefall (NF) production for slash pine approached a "steady state" of 6 Mg·ha-1 at ages 8-14 years, while loblolly pine NF production peaked at 7 Mg·ha-1 at age 10 years, and then declined 17% following curtailment of the fertilizer treatment. Periodic stemwood biomass increment (PAI) for the FW treatment for both species culminated at about 15 Mg·ha-1·year-1 at age 8 years and then declined rapidly (~275%) to <4 Mg·ha-1·year-1 at 15 years; reductions for the untreated control were considerably slower. The progressive decline in PAI following peak leaf area development was closely associated with a decrease in stemwood production per unit leaf area (growth efficiency). A unit increase in leaf area index in the 7- to 9-year-old stands produced about 3.0 and 3.1 times more stemwood biomass per year than in the 14- to 16-year-old stands for loblolly and slash pine, respectively.

Comparison of duration and method of herbaceous weed control on loblolly pine response through midrotation

1993 ◽  
Vol 23 (10) ◽  
pp. 2116-2125 ◽  
Author(s):  
Dwight K. Lauer ◽  
Glenn R. Glover ◽  
Dean H. Gjerstad
Keyword(s):  
Weed Control ◽  
Loblolly Pine ◽  
Volume Growth ◽  
Tree Height ◽  
Control Treatment ◽  
Control Individual ◽  
First Year ◽  
Individual Tree ◽  
Stem Infection ◽  
Herbaceous Weed Control

Herbaceous weed control studies installed by the Auburn University Silvicultural Herbicide Cooperative to examine response to methods and duration of herbaceous weed control in eight loblolly pine (Pinustaeda L.) plantations were analyzed to determine stand response through age 9. Studies were designed to compare weed control treatments with an untreated check, weed control methods (band vs. broadcast), and weed control duration (first year vs. first 2 years). Pine growth was increased by weed control on all sites. Growth was increased by an additional year of weed control (duration) on about one-half of the sites, but did not differ between band and broadcast treatments (method). Age 9 volume response above the check averaged 27.3 m3/ha for first-year weed control and 42.9 m3/ha for the first 2 years of weed control. Individual-tree height growth between ages 7 and 9 did not differ by treatment at most sites, but stand volume growth was higher with weed control at six of the eight sites. Uniformity of individual tree size, as represented by the standard deviation of DBH adjusted for dominant height, was more dependent on survival, hardwood encroachment, and level of fusiform rust stem infection, which varied by treatment and site, than on the result of herbaceous weed control per se. Growth projections made with the least intensive weed control treatment at each site indicated that on average, merchantable volume at age 22 with weed control will equal that of an age 25 stand without weed control. Largest gains were on sites where weed control increased survival.

Preemergence Weed Control in Southeastern Forest Nurseries

Weed Science ◽  
1973 ◽  
Vol 21 (4) ◽  
pp. 363-366 ◽  
Author(s):  
T. R. Dill ◽  
M. C. Carter
Keyword(s):  
United States ◽  
Pinus Taeda ◽  
Weed Control ◽  
Loblolly Pine ◽  
Southeastern United States ◽  
Pinus Elliottii ◽  
Slash Pine ◽  
High Rate ◽  
Forest Nurseries ◽  
Low Rate

Weed control trials were conducted on loblolly pine (Pinus taedaL.) or slash pine (Pinus elliottiiEngelm.) seedbeds at 12 locations in the southeastern United States. Good weed control was obtained from 2,4-bis-(isopropylamino)-6-(methylthio)-s-triazine (prometryne) at 2.2 and 4.5 kg/ha;N,N-dimethyl-2,2-diphenylacetamide (diphenamid) at 4.5 and 9 kg/ha; α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin) at 1.1 and 2.2 kg/ha; and 2-ethylthio-4,6-bis-isopropylamino-s-triazine (GS-16068) at 2.2 and 4.5 kg/ha as preemergence applications immediately followed by irrigation. Diphenamid and trifluralin treatments were not injurious to either pine species at either rate. GS-16068 was only slightly injurious at the high rate at one location. Prometryne was injurious at two locations at the high rate and at one location at the low rate.

An Economic Evaluation of the Use of Oust for Herbaceous Weed Control in Loblolly Pine Plantations

1992 ◽  
Vol 16 (1) ◽  
pp. 40-47 ◽  
Author(s):  
Rodney L. Busby
Keyword(s):  
Pinus Taeda ◽  
Weed Control ◽  
Loblolly Pine ◽  
Economic Returns ◽  
Stand Growth ◽  
Growth Increments ◽  
Long Term Effect ◽  
Herbaceous Weed Control ◽  
Pinus Taeda L

Abstract Herbaceous weed control using Oust (sulfometuron methyl²) is economically efficient in loblolly pine (Pinus taeda L.) plantations given reasonable expectations about the long-term effect of the treatment on stand growth. Increases in the sizes of the growth increments following treatment that have been reported in the literature, and the economic returns this analysis shows are possible, indicate that investment in herbaceous weed control can be a prudent silvicultural option. South. J. Appl. For. 16(1):40-47.

Interaction Between Weed Control and Loblolly Pine,Pinus taeda, Seedling Quality

1988 ◽  
Vol 2 (2) ◽  
pp. 191-195 ◽  
Author(s):  
Robert J. Mitchell ◽  
Bruce R. Zutter ◽  
David B. South
Keyword(s):  
Pinus Taeda ◽  
Weed Control ◽  
Loblolly Pine ◽  
Volume Growth ◽  
Diameter Class ◽  
Complete Control ◽  
Pine Seedlings ◽  
Collar Diameter ◽  
Herbaceous Weed Control ◽  
Root Collar

Third-year heights, third-year root-collar diameters, and 3 yr volume growth of loblolly pine seedlings were examined in relation to a) root-collar diameter class at time of planting and b) herbaceous weed control. Treatments were a) no weed control and b) complete control for 2 yr. For both weed control treatments, means for third-year heights, groundline diameters, and volume growth were related positively to initial seedling diameter. The influence of initial seedling diameter on third-year diameters and heights did not differ among weed control treatments. However, the influence of initial diameter on volume growth did differ among weed control treatments. Thus, when using herbaceous weed control, additional gains in early volume growth can be realized by planting seedlings with large root-collar diameters.

Impacts of Herbaceous Weeds in Young Loblolly Pine Plantations

1981 ◽  
Vol 5 (3) ◽  
pp. 153-158 ◽  
Author(s):  
Larry R. Nelson ◽  
Richard C. Pedersen ◽  
Lanny L. Autry ◽  
Stuart Dudley ◽  
John D. Walstad
Keyword(s):  
Soil Moisture ◽  
Weed Control ◽  
Loblolly Pine ◽  
Ground Cover ◽  
Biomass Accumulation ◽  
First Year ◽  
Seedling Height ◽  
Weed Infestation ◽  
Plant Moisture ◽  
Pinus Taeda L

Abstract The effects of herbaceous weed competition on loblolly pine (Pinus taeda L.) development during the first year of plantation growth were investigated on five sites across the South. Seedling height-growth response to weed control in relation to soil type, soil moisture, soil nutrients, and weed-infestation levels was examined. Seedling height response to weed control was significantly related to percent ground cover of weeds 7 weeks after herbicide applications and to weed biomass accumulation at the end of the growing season. Plant moisture measurements and analysis of precipitation occurrence indicated that weeds depleted the soil moisture necessary for maximum pine height development. Twelve-and four-fold increases in pine biomass due to weed control occurred on sites in Arkansas and Oklahoma, respectively. Results demonstrate the benefits of total weed control to loblolly pine seedlings during the first three years on two sites.

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