Agriculture fluctuations

Nature, 2020

chapter in: Hebinck, P. and Peter C. Lent (eds), Livelihoods and Landscapes: The people of Guquka and Koloni and their resources . Leiden/Boston: Brill Academic Publishers, 2007

2003 Annual Meeting August 16 22 2003 Durban South Africa, 2003

2019

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. European Conference on Crop Diversification Does diversity affect dynamics of agricultural system facing perturbations? Manon Dardonville, Nicolas Urruty, Christian Bockstaller, Olivier Therond

Journal of Agricultural Economics, 1985

Recent gro wlh in world cereal production has been accompanied by a more lhan proporlional increase in the slandard deviation of production. This study applies variance decomposilion procedures lo data on crop production by major geographical regions of the world to analyse the sources of this increased inslabilily. / I is found [hat [he increase in aggregate production variability is predominantly due to increased yield variability and to a simultaneous loss in offseffing palterns of variation in yields belween crops and regions. These changes are probably associaled with the sharp increase in the variability of world cereal and oil prices since the early 1970s and wilh /he more widespread adoption of improved seed/ferliliser inlensive technologies.

International Journal of Current Research in Biosciences and Plant Biology

and Balasore districts. Climatic and soil conditions of these areas are very much suitable for cultivation of different kharif food grain crops. Food grains include both cereals and pulses. Major cereals grown in these areas are rice, ragi, maize, wheat and bajra and major pulses grown in these areas are green gram, black gram, kulthi and arhar. To study the variation in yield of major kharif food grains, a study is made about the area and production of kharif food grains in these coastal districts from the year 1993-94 to 2014-15. This study includes test of significance of change in mean and variance of area, yield and production of kharif food grains from Period-I (1993-94 to 2002-03) to Period-II (2003-04 to 2014-15). To test the significance of change in mean and variance of area, yield and production of kharif food grains, we have to calculate the mean and variance of area, yield and production of kharif food grains from Period-I to Period-II by using Fisher′s t-test and Snedecor's F-test respectively. Increase in the production of kharif food grains of Odisha after the year 2003-04 is due to adoption of new and improved technologies. High variation in mean yield and mean production of kharif food grains is marked which may be due to uneven spread of technologies. In Balasore, Bhadrak, Ganjam and Kendrapada districts change in yield variance contributes more towards change in variance of production. More variation in yield in the above districts is due to scattered land holdings by farmers.

2012

Bangladesh Journal of Agricultural Research, 2008

The study measured the change and instability in area, production, and yield of two major cereal crops wheat and maize in Bangladesh based on secondary data during 1980/81-2003/04 using different statistical techniques. Area and production of wheat increased satisfactorily. But yield was not increased to meet the demand of the country. In the case of maize, significant increment happened in yield during the study period. Area and production of maize also increased to fulfill the increasing demand of population. Presently production of maize increased more rapidly than its area. The growth in area, production, and yield of wheat slightly improved in period-II, whereas the growth rate in area, production, and yield of maize improved rapidly. Though both of wheat and maize are unstable crops, maize showed very instability in its area and production because of its increasing tendency in the recent years.

2003 Annual Meeting, …, 2003