Pasture production under densely planted young willow and poplar in a silvopastoral system |
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Authors: | Z Hussain P D Kemp D J Horne I K D Jaya |
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Institution: | (1) Institute of Natural Resources, Massey University, Palmerston North, New Zealand;(2) Faculty of Agriculture, University of Mataram, Jl. Majapahit 62 Mataram, 83125, Indonesia |
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Abstract: | New Zealand is subject to summer and autumn droughts that limit pasture growth. The planting of willow and poplar trees is
one option used to provide green fodder during drought. However, there is a wide concern that such an option can reduce the
overall understorey pasture growth. This study evaluated the comparative establishment and growth of densely planted young
willow and poplar and their effects on understorey pasture growth. Two experiments were established for 2 years in Palmerston
North and Masterton, North Island, New Zealand. In the first experiment, densely planted willow and poplar significantly reduced
understorey pasture growth by 24 and 9%, respectively, mainly due to shade, but coupled with soil moisture deficit in summer.
In the second experiment, pasture growth in a willow browse block was 52% of that in open pasture as a result of shade and
differences in pasture species composition and management. Willow and poplar survival rates were similar (P > 0.05) after 2 years of establishment (100 vs. 90.5%, respectively). However, willow grew faster than poplar in height (1.90
vs. 1.35 m), stem diameter (43.5 vs. 32.6 mm), canopy diameter (69 vs. 34 cm) and number of shoots (8.7 vs. 2.3) at the age
of 2 years. |
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Keywords: | Agroforestry Shade Soil moisture Tree establishment Tree growth Canopy closure |
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