نتایج جستجو برای: Problems of greenhouse growers
تعداد نتایج: 21209322 فیلتر نتایج به سال:
The purpose of this study is to investigate problems and barriers of greenhouse growers in Isfahan Province, Iran using the qualitative paradigm. Data were collected with semi-structured interviews and direct observations. Most participants were questioned by phone interview. The response rate to phone calls was 59.2 percent. Data are analyzed by the grounded theory. Structural analysis is util...
abstract: in this thesis, we focus to class of convex optimization problem whose objective function is given as a linear function and a convex function of a linear transformation of the decision variables and whose feasible region is a polytope. we show that there exists an optimal solution to this class of problems on a face of the constraint polytope of feasible region. based on this, we dev...
The objective of this study was to determine the prevalence of occupational asthma and sensitization to workplace allergens in greenhouse flower and/or ornamental plant growers. A random sample of 40 growers who cultivated such crops and had participated in the European Farmers' Study was selected for a cross-sectional study that included (1) greenhouse characteristics and air contaminants (dus...
with the increasing population and the need for more food, as well as with the development of science and technology, human approach to unnatural and often chemical inputs to increase agricultural production has been a great expansion and problems such as increased cancers, chronic diseases has created environmental pollution. implementation of organic organic is a solution to these problems . ...
abstract global financial crisis has created too many problems in relations among governments. among these problems, the issue of global monetary management, more than every time in the past four decades, has been moved in the center of international economic attentions. a problem which is specially known with the monetary hostility between united states and public republic of china. where ar...
during natural gas processing, water in natural gas may cause to hydrates formation in pipelines which may lead to serious damages to process equipments. given the problems raised by present of water in natural gas, glycol solvent uses to remove water.in contact of glycol with gas always an amount of btex and voc absorb along with water, which on glycol recovery process, these substances separa...
INTRODUCTION: The ability to assess plant problems in the field or greenhouse is a major task for growers and plant inspectors. For the novice diagnostician, the task can be intimidating in the absence of a systematic plan for discovering the causes of plant injury. For the more accomplished diagnostician, use of a systematic approach can help avoid the bias of looking only for the familiar syn...
In Florida, 7,100 acres of fresh strawberries (Fragaria ×ananassa Duch.) were planted in fields during the 2003–04 growing season using polyethylene mulch raised beds and drip irrigation. Florida is the second largest fresh market strawberry-producing state behind California. Because Florida enters the market prior to California during the winter months, Florida strawberry value per pound excee...
Market pressure is forcing New Zealand greenhouse tomato growers to shift from conventional to more environmentally-friendly pest control methods such as IPM (Integrated Pest Management). Growers can access IPM manuals, but these tend to provide generalized advice, which they find difficult to apply to their own situations. Alternatively, growers can use consultants to tailor IPM strategies to ...
abstract this thesis includes five chapter : the first chapter assign to establish fuzzy mathematics requirement and introduction of liner programming in thesis. the second chapter we introduce a multilevel linear programming problems. the third chapter we proposed interactive fuzzy programming which consists of two phases , the study termination conditions of algorithm we show a satisfac...
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