Managing Salinity In Degraded Soils By
Mandatory Tree Planting: On Dynamics And
Economic Modeling Of A Common Pool Resource
Author(s)
E. A. Nuppenau
Abstract
Many farming areas in the semi-arid tropics and sub-tropics are characterized by
increasing salinity. Due to (1) the common property problem of the media, water,
(2) high transaction costs in soil protection and (3) non-point-pollution problems,
salinity is a common feature of poorly managed irrigation schemes.
Environmental regulations, governing water use, and farm practices such as (1)
limitations in water dosage, (2) specific plants mixes, etc., but also (3)
regeneration of soils, by methods such as (4) fallowing, (5) tree planting, (6)
applying gypsum, etc., are normally not in the direct interest of small-holder
farmers. Such measures reduce current income and future benefits have to be
shared. In contrast as a new idea, tree planting to extract salt and minimize
shocks from droughts have gained the interest of salinity management, notably
as a low cost and appropriate technology solution. This paper presents an
innovative model that accounts for salinity in the short and long run; introduces
mandatory tree planting to farmers for salinity reduction; and reckons current
income waivers from reduced cropping for trees. A dynamic concept is used to
control farm activities and cater for a reduction of salinity in communities. It
models water tables, tree cover and salt content.
Keywords: tree planting, salinity, dynamic optimization.
1 Introduction
In irrigation projects the salinity of soils is a serious and complex problem for
resource economics [1]. Salinity threatens agricultural production in many areas
of the tropics and subtropics. Though gypsum application and leaching are
possible treatments [2] they are mostly too expensive for farmers. However,
salinity may change through soil improvements associated with fallowing and
Keywords
tree planting, salinity, dynamic optimization.
Related Book
Other papers in this volume
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