Skip to Main Content
Relationship between tillage intensity and initial growth of loblolly pine seedlingsAuthor(s): M. Chad Lincoln; Rodney E. Will; Emily A. Carter; John R. Britt; Lawrence A. Morris
Source: Gen. Tech. Rep. SRS-92. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 191-194
Publication Series: Miscellaneous Publication
PDF: Download Publication (410 KB)
DescriptionTo determine the relationship between changes in soil attributes associated with differing tillage intensities and growth of loblolly pine seedlings, we measured soil moisture, nitrogen (N) availability, and soil strength across a range of tillage treatments on an Orangeburg soil series near Cuthbert, GA (four replications). We then correlated these measurements to the growth of individual seedlings. The five tillage treatments were: no-till (NT), coulter only (C), coulter + subsoil (CS), coulter + bed (CB), and coulter + bed + subsoil (CSB). Adjacent to 3 trees per plot (60 trees total), soil moisture was measured every 2 weeks using TDR, soil N availability was measured monthly by KCl extractions, and soil strength was measured 2 times during the year using a cone penetrometer beginning in May, 2003. In December of 2003, the 60 trees were excavated to determine tree biomass. Average soil moisture in the upper 60 cm decreased from 28 percent in the NT treatment to 22 percent in the CB and CSB treatments. Nitrate concentrations increased by 33 percent in the bedded treatments (CB and CSB) compared to the NT, C, and CS treatments. From 0 to 200 mm, bedding decreased the average soil strength by 46 percent compared to the other treatments. Subsoiling decreased soil strength at depths > 200 mm. Tillage positively affected relative height growth (p = 0.0005), and all the tillage treatments increased relative height growth compared to the NT treatment. Soil strength between 0 and 100 mm (P=0.002, r2=0.41) was positively correlated with seedling relative height growth. Soil moisture from 0 to 300 mm (P=0.0016, r2=0.44) was negatively correlated with seedling relative height growth. In contrast, N availability was not correlated to seedling growth. These results indicate tillage increases rootability by decreasing soil strength and increasing porosity, and that these changes are associated with increased seedling growth.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLincoln, M. Chad; Will, Rodney E.; Carter, Emily A.; Britt, John R.; Morris, Lawrence A. 2006. Relationship between tillage intensity and initial growth of loblolly pine seedlings. Gen. Tech. Rep. SRS-92. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 191-194
- Soil change and loblolly pine (Pinus taeda) seedling growth following site preparation tillage in the Upper Coastal Plain of the southeastern United States
- An approach for using general soil physical condition-root growth relationships to predict seedling growth response to site preparation tillage in loblolly pine plantations
- Site preparation for red oak plantation establishment on old field sites in southern Indiana
XML: View XML