نتایج جستجو برای: global hectare
تعداد نتایج: 450841 فیلتر نتایج به سال:
The aim of this paper is a comparison of the operating parameters of combine harvesters on a selected farm. The working parameters were measured and evaluated on combine harvesters of the CLAAS and CASE IH brand by different ages and different concepts of threshing. Measuring took place in the season of 2013 and 2014 (Lexion 770 in 2012 too). Working parameters in this case mean the performance...
Red-headed Woodpeckers (Melanerpes erythrocephalus) are endangered because they have experienced population declines of up to 80% in the past 40 years. The purpose of this study was to identify key habitat and nest-tree characteristics that contribute to successful breeding at Cedar Creek Ecosystem Science Reserve in East Bethel, Minnesota, with the goal of making recommendations to recovery pr...
Several studies have suggested that geostatistical techniques could be employed to reduce overall transactions costs associated with contracting for soil C credits by increasing the efficacy of sampling protocols used to measure C-credits. In this paper, we show how information about the range of spatial autocorrelation can be used in a measurement scheme to reduce the size of the confidence in...
Cotton is one of the most important smallholder cash crops in Sub-Saharan Africa (SSA). How to ensure input supply, credit recovery and competition is a subject of intense policy debate. This paper examines the performance of cotton sector development policies in Mozambique and Zambia. Both countries face the challenge of organizing input supply to farmers in the absence of rural credit markets...
A simple two-parameter model resembling the classical voter model is introduced to describe macroecological properties of tropical tree communities. The parameters of the model characterize the speciation- and global-dispersion rates. Monte Carlo type computer simulations are performed on the model, investigating species abundances and the spatial distribution of individuals and species. Simula...
Amazon forests are a key but poorly understood component of the global carbon cycle. If, as anticipated, they dry this century, they might accelerate climate change through carbon losses and changed surface energy balances. We used records from multiple long-term monitoring plots across Amazonia to assess forest responses to the intense 2005 drought, a possible analog of future events. Affected...
This paper presents a pose estimation approach that is resilient to typical sensor failure and suitable for low cost agricultural robots. Guiding large agricultural machinery with highly accurate GPS/INS systems has become standard practice, however these systems are inappropriate for smaller, lower-cost robots. Our positioning system estimates pose by fusing data from a low-cost global positio...
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