منابع مشابه
The new organic - The Boston Globe
BEGINNING IN 1997, an important change swept over cotton farms in northern China. By adopting new farming techniques, growers found they could spray far less insecticide over their fields. Within four years they had reduced their annual use of the poisonous chemicals by 156 million pounds almost as much as is used in the entire state of California each year. Cotton yields in the region climbed,...
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The University of Alaska Fairbanks is an affirmative action/equal opportunity employer and educational institution. • to improve students' achievement in science, use computer and network technology, and help teacher s meet local education standards, • to expand the pipeline of potential future scientists and resear chers for industry, academia and government, • to increase student awareness of...
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The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1876
ISSN: 0036-8733
DOI: 10.1038/scientificamerican02121876-101bsupp