نتایج جستجو برای: a change in crop pattern

تعداد نتایج: 20437986  

2014
Mohar Singh Ishwari Singh Bisht Sandeep Kumar Manoranjan Dutta Kailash Chander Bansal Moreshwar Karale Ashutosh Sarker Ahmad Amri Shiv Kumar Swapan Kumar Datta Qin Zhang

Crop wild relatives (CWRs) are invaluable gene sources for various traits of interest, yet these potential resources are themselves increasingly threatened by the impact of climate change as well as other anthropogenic and socio-economic factors. The prime goal of our research was to cover all aspects of wild Lens genetic resource management like species characterization, agro-morphological eva...

2017
Yi Zhang Yanxia Zhao

The use of modern crop varieties is a dominant method of obtaining high yields in crop production. Efforts to identify suitable varieties, with characteristics that would increase crop yield under future climate conditions, remain essential to developing sustainable agriculture and food security. This work aims to evaluate potential genotypic adaptations (i.e., using varieties with increased ab...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2007
S Mark Howden Jean-François Soussana Francesco N Tubiello Netra Chhetri Michael Dunlop Holger Meinke

The strong trends in climate change already evident, the likelihood of further changes occurring, and the increasing scale of potential climate impacts give urgency to addressing agricultural adaptation more coherently. There are many potential adaptation options available for marginal change of existing agricultural systems, often variations of existing climate risk management. We show that im...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده زیست شناسی 1388

126 abstract: in this research we studied the effects of cyclic hydration and dehydration of cysts of artemia urmiana and artemia parthenogenetica on the hatching percentage, survival and growth. the experiment was carried out in 3 treatments (1-3 hydration/dehydration cycles) with 3 replicates for each treatment. later effects of cold preservation at -20°c during three time periods were ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه هنر اصفهان - دانشکده معماری و شهرسازی 1389

reserches show that relationship between human and residential places is based upo both emotional and identity structures. in other words, habitat place is not only the creator of a part of humanistic identity but also form a kind of sentimental and emotional bond that may result in tendency to maintain closeness to a specific place. therefor, formaton of emotional and identity relationship wit...

2012
Gomatee Singh

The adoption of cropping pattern in any region is an outcome of varied factors, which plays important role i.e. physical, social and economic factors. Some of these are changeable like prices, government policies, technology etc. and have operated very variously at different times. These factors have a combined impact on the decision making process of the farmer. Those which are not subject to ...

Journal: :international journal of agricultural science, research and technology in extension and education systems 2014
agbugba ikechi k. ihemezie eberechukwu j adam e. ahmed

the study examined the sources of informal finance in aiding climate change adaptation in south eastern nigeria. random sampling was adopted in the selection of 6 out of the 9 communities in the study area. from each of these selected communities, 10 crop farmers were randomly selected giving a total number of 60 respondents. descriptive statistics such as percentages and frequency, as well as ...

2015
Deepak K. Ray James S. Gerber Graham K. MacDonald Paul C. West

Many studies have examined the role of mean climate change in agriculture, but an understanding of the influence of inter-annual climate variations on crop yields in different regions remains elusive. We use detailed crop statistics time series for ~13,500 political units to examine how recent climate variability led to variations in maize, rice, wheat and soybean crop yields worldwide. While s...

2009
K. R. Manjunath Sushma Panigrahy T. K. Adhya V. Beri K. V. Rao

The rice land is linked to the climate change due to its methane emission potential. The systems of growing rice and associated soil and crop management practices that have evolved are varied and complex. However, from the methane emission point of view, water regime is a crucial parameter. According to IPCC guidelines the rice ecosystem need to be categorized into four strata for methane emiss...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده علوم 1374

we have devided the thesis in to five chapters. the first recollects facts from purely algebraic theory of jordan algebras and also basic properties of jb and jb* - algebras which are needed in the sequel. in the second chapter we extend to jb* - algebras, a classical result due to cleveland [8]. this result shows shows the weakness of jb* - norm topology on a jb* - algebera. in chapter three, ...

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