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Three-year growth studies of Leucaena leucocephala (1094) and L. pulverulenta (1001) at two spacings in Texas |
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| Authors: | Gideon N Gathaara Edward L Glumac Peter Felker |
| Institution: | a Ministry of Energy & Regional Development (Agroforestry), P.O. Box 30582, Nairobi, Kenya b Department of Biology, University of Houston, Houston, Texas, U.S.A. c Center for Semi-Arid Forest Resources, Caesar Kleberg Wildlife Research Institute, College of Agriculture and Home Economics, Campus Box 218, Texas A&I University, Kingsville, Texas 78363, U.S.A. |
| Abstract: | The productivity of Leucaena leucocephala and a superior L. pulverulenta family were examined over a 3-year period at spacings (1.5 m×1.5 m and 1.5×3.0 m) chosen to compare two mechanical weeding operations. Leucaena pulverulenta was examined since faster-growing families of this cold-hardy, low-mimosine leucaena species were recently identified. There was no significant difference in yields between the species (P = 0.9060) but there was a significant difference between spacings (P = 0.0491). There was no significant spacing×species, species×year or spacing×year interaction. The annual growth rates for the first, second, and third seasons' growth for L. leucocephala were 3.73, 10.11 and 6.00 t ha?1 at the close spacing and 3.03, 7.14 and 5.04 for the wider spacing. The annual growth-rates for the first, second and third seasons' growth for L. pulverulenta were 2.03, 8.35 and 8.31 t ha?1 at the close spacing and 1.25, 9.38 and 5.29 at the wider spacing. Despite the fact that L. leucocephala froze to the ground in the first and second winter when L. pulverulenta was nearly undamaged, the L. leucocephala coppice resprout was greater than the second year's growth for L. pulverulenta. |
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