Effects of thinning on young shortleaf pine plantations in Indiana (1973)Phipps, H. M. (1973). Effects of thinning on young shortleaf pine plantations in Indiana. North Central Research Station, Research Paper NC-93. Retrieved from http://www.treesearch.fs.fed.us/pubs/10614 Studies were established in two young shortleaf pine plantations in southern Indiana to determine if thinning would improve growth and yield. Both plantations had been planted at 6- by 6-foot spacing. Plots in the first plantation were thinned to 120, 100, and 80 square feet of basal area at ages 14 and 21. Plots in the second plantation were thinned to 130, 110, 90, and 70 square feet of basal area at ages 17 and 22. Unthinned plots in both plantations served as controls. It was found that thinning to 100 and 120 square feet increased volume yield and basal area growth rate slightly. Heavier thinning increased d.b.h. but reduced volume yield by as much as 13%. Form class as changed very little by thinning. It does not appear that these stands need to be thinned at an early age. Unless controlled, hardwood species will probably succeed shortleaf pine in these stands http://www.treesearch.fs.fed.us/pubs/10614
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