Fiber Pots with Spin Out for Nursery Crop Production
John M. Ruter
Nurseries have been using pots made from recycled paper fiber for years. Fiber pots have been traditionally used in the northern states for short-term crops like chrysanthemums, bare-root material such as roses and fruit trees, and for fieldgrown shrubs. In the southeast, however, fiber pots quickly deteriorate and were not accepted as a viable alternative for commercial production.
Copper compounds have been used since the 1970s to inhibit root growth in container-grown plants. In the early 1990s, Spin Out (copper hydroxide) was approved for controlling root growth in containers. Copper works by causing a mildly toxic reaction when root tips come in contact with copper-containing surfaces. Since most root tips are not killed, the benefit of coming in contact with copper is increased root branching. Plants grown in pots treated with copper hydroxide do not have malformed root systems or roots matted against the substrate: container interface.
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