abstract_textpFarmers' willingness to grow trees depends on many factors. If governments or other organizations want farmers to grow more trees, they have to understand these factors. This article describes the expansion of the tree component in farming systems in recent decades in the Gunung Kidul district. This trend is then explained with elements of the induced innovation model of agricultural development, namely in terms of resource endowment, demand for products and institutional aspects. An increase in the productivity of staple crops seems to have been an important factor permitting farmers to plant trees. Another factor related to factor endowment that farmers induced to grow trees is the response to declining soil productivity as a result of erosion. The Indonesian government's trade and pricing policy for certain tree products has supported the favourable market trend for these products, and has induced farmers to plant fruit and fodder trees especially. Improvement of the (physical) infrastructure has demonstrably encouraged tree growing. Examples are given of technological change in tree growing that result from farmers' own innovation as well as from research done by various organizations./p/abstract_text
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