November 3, 2020 - Report summarizes findings from plots comparing release from hardwood competition by aerial application of herbicides at age three to no treatment and measured through age 19. Herbicide plots averaged 22% more basal area and 38% more volume than check plots.
Tags: Research Studies
No. 102 Loblolly Pine Release Response to Complete Elimination of Understory Vegetation; by T. A. Dierauf
November 3, 2020 - Report provides information regarding loblolly pine growth through age 18 on plots released from understory (blueberry and huckleberry) vegetation at age 10. Complete elimination of understory competition had no significant impact on diameter or basal area growth.
November 3, 2020 - Report provides age 24 pulpwood yields on plots of a three-year study of eight direct seeding treatments (two rates x four sowing dates). Yields at age 24 ranged from 6.6 to 29.1 cords per acre, considerably less than would be expected from plantations at the same age.
November 3, 2020 - Report provides three-year results from a study of effects of exposed long roots on planted loblolly pine seedlings. Lateral roots extending from the planting hole and exposed on the surface did not reduce survival or subsequent height growth.
No. 105 Stripping Lateral Roots From Loblolly During Lifting; by T. A. Dierauf, L. A. Chandler, and D. L. Hixson
November 3, 2020 - Report provides three-year survival results of loblolly pine seedlings with no root damage, all lateral roots removed, and all lateral roots removed plus taproot damage. Most of the seedlings with roots removed died, while survival of undamaged seedlings was satisfactory.
No. 106 A Three-year Loblolly Pine Interplanting Study on Site-Prepared Forestland; by T. A. Dierauf
November 3, 2020 - Report provides 20-year results of a study comparing planting 824 trees per acre, 412 trees per acre, and 412 trees per acre followed by interplanting another 412 trees the following year. Interplanting had a negative effect on stand productivity, reducing average stem diameter and increasing the number of sub-merchantable trees.
No. 107 Loblolly Pine Seedling Grade – Effect on Survival and Growth Through 20 Years; by T. A. Dierauf, J. A. Scrivani, and L. A. Chandler
November 3, 2020 - Report summarizes 20-year growth of loblolly pine in studies comparing small, average, and large initial root collar diameter. Large seedlings survived only slightly better than average seedlings, but small seedlings suffered considerable mortality. Even if small seedlings had survived as well as the others, they would have produced significantly less volume.
November 3, 2020 - Report provides three-year results comparing seedlings ranging in root collar diameter from 2/32 to 6/32 inches. Age 25-26 growth data are also reported but are difficult to interpret because the original planting was at a 3 x 3 feet spacing.
No. 109 Effect of Initial Root Collar Diameter on Survival and Growth of Yellow Poplar Seedlings; by T. A. Dierauf and J. W. Garner
November 3, 2020 - Report summarizes 20-year growth of yellow-poplar as affected by initial root collar diameter.
No. 094 A Five-Year Study of Different Sawdust and Nitrogen Rates in a Loblolly Pine Nursery; by T. A. Dierauf
November 3, 2020 - Report provides results from a series of trials comparing three sawdust rates, three nitrogen rates, and top clipping on loblolly pine seedling development. After three seasons, there were no consistent effects on survival or height. Top clipping consistently improved survival.