منابع مشابه
Using rice cultivar mixtures: a sustainable approach for managing diseases and increasing yield
The adoption of modern rice cultivars has increased annual production in the past three decades by 2.4% per annum and average yield by 71% (Khush and Virk 2002). Modern cultivars continue to replace thousands of traditional cultivars (Chang 1994). Although the number of landraces used in breeding modern cultivars has increased in the same period (Hossain et al 2003), many modern cultivars share...
متن کاملAspects of groundwater supply sustainable yield.
Introduction Groundwater supply sustainable yield is herein defined as how much water can be withdrawn from an aquifer system, where and for how long, with acceptable physical, economical, environmental, social, cultural, institutional, and legal consequences. The purpose of this Technical Commentary is to focus on the following technical aspects of groundwater supply sustainable yield that are...
متن کامل9. Some constructive criticisms of the Index of Sustainable Economic Welfare
The Index of Sustainable Economic Welfare (ISEW) was first calculated for the United States by Daly and Cobb (1989). It draws upon an earlier tradition of attempts to build a comprehensive indicator of economic welfare, beginning with Nordhaus and Tobin (1972). Since then it has been applied to a handful of other countries, including several in Western Europe as well as Australia, Chile and Tha...
متن کاملMaximum Sustainable Yield Policy in Prey-Predator System-A Study
In this paper, maximum sustainable yield policy in prey-predator system is discussed where the prey population follows logistic law of growth. Here a model is proposed involving linear prey–predator interaction and intra-specific competition among predator populations. The growth rate of the predator depends upon predation on the modelled and alternate prey. In traditional prey–predator system,...
متن کاملThe Ultimate - Sustainable - Yield Problem in Nonlinear Age - Structured Populations
The Beverton-Holt theory of harvesting a multicohort fishery subject to constant recruitment, and the Leslie matrix harvesting model modified to include a nonlinear stock-recruitment relationship, are extended and shown to be related through the ultimate-sustainable-yield problem for an age-structured population. The well-known result that the optimal harvesting policy for the Leslie matrix mod...
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ژورنال
عنوان ژورنال: Journal of Global Innovations in Agricultural and Social Sciences )
سال: 2016
ISSN: 2312-5225,2311-3839
DOI: 10.22194/jgiass/4.2.741