نتایج جستجو برای: 51 and 135 percent more efficient than chemical control
تعداد نتایج: 17180098 فیلتر نتایج به سال:
Supervised control of field crop insect pests was first developed on the northwest side of the San Joaquin Valley. For three years it has been in successful operation in connection with the control of the alfalfa caterpillar, and has been expanded to the control of other pests on alfalfa and to pests of cotton. Supervised control has not been developed for such crops as deciduous and citrus fru...
Background and aims: There are annually millions of work-related accidents leading to either loss of life or disability. Coal mine workers, due to the nature of their work, are at a higher risk of work accidents. With regard to the importance of health statue of skilled workers and prevention of work-related injuries, in this study work-related injuries in Kerman Coal Mines during 1991-2006 w...
increasing academic and professional language demands around the world are not a deniable fact. the purpose of this study was to investigate english language needs and communication needs of the chemistry students at master and ph.d. levels at the iranian universities. in this research, different methods were used including un-structured interview, structured interview, and two sets of question...
in this thesis, we consider a mathematical model of cancer with completely unknown parameters. we study the stability of critical points which are biologically admissible. then we consider a control on the system and introduce situations at which solutions are attracted to critical points and so the cancer disease has auto healing. the lyapunov stability method is used for estimating the un...
abstract in order to evaluate chemical control of bermudagrass (cynodon dactylon (l.) pers.) on mixture turf: (lolium perenne 20%,poa pratensis.20%,festuca arundinacea 20% and festuca rubra commutata 40%), an experiment was conducted during 2006 in tehran, using randomized complete block design with 4 replications and 11 treatments. treatments were diclpfop methyl at 900 and 1080 g a.i. ha-1, f...
In order to study the effect of organic and chemical fertilizers on some agronomical properties of burley tobacco, an experiment was carrid out in a randomized complete block design with six fertilizer treatment and three replications at the research field of Shahrekord University in 2013. Fertilizer treatments were including of: control, chemical fertilizer equal 100 percent of tobacco needs, ...
analyzing efficiency in each economic sector to adopt policies for optimal use of production factors and avoid wasting resources is important. in this study, in order to have a more comprehensive evaluation of the performance of each unit, efficiency of broiler firms was measured using bounded data envelopment analysis which determines position of each unit relative to efficient and inefficient...
the following null hypothesis was proposed: h : there is no significant difference between the use of semantically or communicatively translates scientific texts. to test the null hypothesis, a number of procedures were taken first, two passages were selected form soyrcebooks of food and nutrition industry and gardening deciplines. each, in turn, was following by a number of comprehension quest...
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