Infant attachment[ edit ] The attachment system serves to achieve or maintain proximity to the attachment figure. In close physical proximity this system is not activated, and the infant can direct its attention to the outside world. Within attachment theory, attachment means "a biological instinct in which proximity to an attachment figure is sought when the child senses or perceives threat or discomfort. Attachment behaviour anticipates a response by the attachment figure which will remove threat or discomfort".
Pardey, and Julian M. Alston Growth in supply of agricultural commodities is primarily driven by growth in productivity, especially as land and water resources for agriculture have become more constrained.
Hence, the future path of agricultural productivity will be the key determinant of the future of the world food equation. Here we present and assess trends in agricultural productivity growth over recent decades as a first step to informing views about likely agricultural supply and food security outcomes worldwide over the decades ahead.
Our emphasis is on global trends in selected partial factor productivity measures that express output relative to a particular input such as land or labor.
These include crop yields, which measure the quantity produced of a particular output relative to a particular input, land. Descriptions of more-complete measures of productivity for selected key agricultural countries or regions of the world, including Canada, China, the former Soviet Union FSU and Eastern Europe, and the United States, are presented in the articles that follow.
Productivity Patterns Measuring and interpreting productivity and its rate of growth is difficult enough, let alone changes in productivity growth rates.
The substantial annual variation in input use and uncontrolled factors such as weather together drive the year-to-year variation in aggregate output. This makes it difficult to discern the onset, magnitude, and duration of any structural shifts in agricultural productivity trends Figure 1.
Year-to-year variations in measured productivity growth might reflect the influences of short-term, transient factors such as weather impacts or policy changes; they might also be the result of measurement errors such as those associated with variable utilization rates of capital or land.
In addition, measured growth rates are sensitive to the choices of starting and ending dates, and more so when the intervals are shorter. Crop Yields Figure 2 includes yield growth rates for selected U.
For maize, wheat, and rice, yield growth rates accelerated in the second half of the 20th Century relative to the first half; in the second half of the century wheat and maize yields grew at around three times the growth rate in the first half century.
For soybeans, in contrast, the rate of growth of yields after was half that for However, for all four crops, the average annual rates of yield growth were much lower in than in For example, maize yields increased by 2. Global annual average rates of yield growth are reported in Table 2, which includes separate estimates for high- middle- and low-income countries and the world as a whole, for two sub-periods: The slowdown evident for the global averages Table 2 mirrors the slowdown in U.
Thus low-income countries gained some ground sincehowever the rebound in yield growth in this part of the world failed to fully make up for the comparatively low growth rates they experienced in Consequently, significant yield gaps persist: For all four commodities, in both high- and middle-income countries—collectively accounting for between The growth of wheat yields slowed the most and, for the high-income countries as a group, wheat yields barely changed over Global maize yields grew at an average rate of 1.
Likewise rice yields grew at less than 1.The 95 Theses and their Results () Background. From Luther was not only theology professor at Wittenberg University but also the priest at the City Church in Wittenberg.
So he was also responsible for the salvation of his parish. What was the significance of the 95 Theses? November 5, What were the 95 Theses?
According to historic legend, Yet it is important to bear in mind that, had the pope offered a reconciliation, Luther would have returned to the doctrine of the established Church. Apr 09, · Best Answer: The 95 Theses on the Power and Efficacy of Indulgences,commonly known as The Ninety-Five Theses, was written by Martin Luther in and is widely regarded as the primary catalyst for the Protestant Reformation.
The disputation protests against clerical abuses, especially the sale of grupobittia.com: Resolved. Attachment theory is a psychological model attempting to describe the dynamics of long-term and short-term interpersonal relationships between humans.
"Attachment theory is not formulated as a general theory of relationships; it addresses only a specific facet": how human beings respond within relationships when hurt, separated from loved ones, or perceiving a threat.
The interpretation of average global crop yields is problematic for several reasons. It can be especially difficult to disentangle the effects of changes in technologies, such as improved crop cultivars, from changes in the use of inputs like fertilizer, pesticides, and irrigation.
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