Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 6 · column 6 of 8 · from the scan, no model involved
used herbicide, 38,000 kilocalories were required per acre and this included energy used in production of the chemical. Hand labor required 33,000 kilocalories per acre.
Applying this information, Iowa State University scientists have concluded that hand labor, while the most energy efficient, is not practical. They figure that two hand weedings at 60 hours an acre would be needed for Iowa’s 20 million acres of corn and soybeans. Assuming a 40-hour work
96.1%