نتایج جستجو برای: four treatments including rangeland as control
تعداد نتایج: 6954577 فیلتر نتایج به سال:
building on previous studies on intellectual features and learners’ grammar learning, the present study aimed at investigating whether intelligence criterion had any impact on efl learners’ english grammar learning across two intelligence levels. in the current study, the participants were divided into two experimental and control groups by administration of raven i.q. test. this led to the for...
field experiments were conducted in amirkabir sugarcane agro-industry (khuzestan province, iran) farms to evaluate the efficacy of integrated chemical and mechanical methods in controlling weeds. experiments were carried out in a split plot-randomized complete blocks design with four replications. the main plot consisted of four mechanical treatments, namely: hilling up, sweep cultivator, disc ...
a significant problem in multicarrier communication systems is the necessity to reduce the value of papr (peak-to-average power ratio) of transmitting signal. in this thesis we study the effect of the system parameters such as coding and modulation types on papr and ultimate ber in a mc-cdma system. in this study we consider fading channel as well as the nonlinearity of transmitter’s amplifier ...
Allen andWest recently proposed that dingoes (Canis dingo, including hybrids with feral dogs C. lupus familiaris) are a critical causal factor in the decline of Australia’s sheep (Ovis aries) flock and implied that dingoes would cause the rangeland sheep industry to disappear within 30−40 years. We agree that dingo predation can reduce the profitability of affected sheep properties and has impo...
poa genus has a high value for grazing and forage conservation concerning thelivestock. in order to study the impacts of cold temperature and growing degree days(gdd) on seedling morphological trait and phonological development of two speciesinvolving poa pratensis and poa trivialis, this research was conducted in laboratory andgreenhouse and outdoor of research institute of forest and rangelan...
Although the emerging field of precision livestock farming (PLF) is predominantly associated with intensive animal production, there is increasing interest in applying smart technologies in extensive rangeland systems. Precision livestock farming technologies bring the possibility of closely monitoring the behaviour, liveweight and other parameters of individual animals in free-ranging systems....
abstract a field experiment was conducted at iranian plant protection research farm in karaj during 2009 to evaluate the effects of diffrent planting patterns, times of mechanical control and herbicides application on weeds density and biomass in sugar beet farms. the experimental design was split–split plot based on randomized complete block design (rcbd) with four replications. planting patte...
need to increasing agricultural land in order to improve food resources in the past two centuries recentlead to widespread changes in land use and improper management of these lands. continue thisprocess can lead to land degradation and desertification, and improve such soils is very costly;therefore, prevention of land degradation is more desirable. this function requires to research on theuti...
Support for range management interventions by the World Bank and other international development institutions has a somewhat checkered history. In certain respects, this has mirrored theoretical developments and shifts in thinking among rangeland professionals, but the relationship between rangeland science and development policy and practice is far from direct. It is mediated by contextual fac...
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