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  2. History of fertilizer - Wikipedia

    en.wikipedia.org/wiki/History_of_fertilizer

    Other European and North American fertilizer companies developed their market share, forcing the English pioneer companies to merge, becoming Fisons, Packard, and Prentice Ltd. in 1929. [ citation needed ] Together they produced 85,000 tons of superphosphate/year in 1934 from their new factory and deep-water docks in Ipswich .

  3. Age and female fertility - Wikipedia

    en.wikipedia.org/wiki/Age_and_female_fertility

    The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]

  4. Guano - Wikipedia

    en.wikipedia.org/wiki/Guano

    The Guano Age ended with the War of the Pacific (1879–1883), which saw Chilean marines invade coastal Bolivia to claim its guano and saltpetre resources. Knowing that Bolivia and Peru had a mutual defense agreement, Chile mounted a preemptive strike on Peru, resulting in its occupation of the Tarapacá , which included Peru's guano islands.

  5. History of agriculture - Wikipedia

    en.wikipedia.org/wiki/History_of_agriculture

    The Bronze Age, from c. 3300 BC ... At least 11 separate regions of the Old and New World were involved as independent centers of origin. ... Fertilizer, in the shape ...

  6. When does 'old age' begin? Public perception may be skewing later

    www.aol.com/news/does-old-age-begin-public...

    “So if they’re 70 years old, they’ll say old age begins at 75. And when they get to 75, they’ll say old age begins at 80.” Of course, age doesn’t always correlate with health status.

  7. Agriculture in the Middle Ages - Wikipedia

    en.wikipedia.org/wiki/Agriculture_in_the_Middle_Ages

    Climatic change may have played a part as the Little Ice Age may have begun between 1275 and 1300 with a consequent shortening of the growing season. [65] Warfare was apparently responsible for a major famine in Hungary from 1243 to 1245. These were the years in the aftermath of the Mongol invasion and widespread destruction. Twenty to fifty ...

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