When we’re buying groceries by weight, being a few grams off may not be a big deal. But we do expect the store scales to be calibrated to show the exact measure. The situation becomes more complicated when we want to know the exact measure of something weighing a hundred tons or more. VOA’s George Putic visited a lab that calibrates large-force instruments.
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Each spring and summer, a Vermont bog yields a rare spectacle — hundreds of wild orchids in bloom, drawing visitors from around the country.
The bulbous pink and white showy lady’s slippers (Cypripedium reginae) are on full display among the ferns, bushes and chirping birds at Eshqua Bog in Hartland.
This particular orchid, considered rare in Vermont and a number of other states and different from the more common pink lady’s slipper, thrives in Eshqua, because of the wet, sunny conditions, with soils containing peat and lime.
Mary English drove about an hour from Landgrove, Vermont, to see the orchids on Thursday. When she arrived, she had the bog to herself.
“I just wandered through by myself. It was very special. It’s like being in a South American country,” she said.
A boardwalk allows visitors of all ages and abilities access to the bog and an up-close look at the plants.
“Gosh, aren’t they beautiful?” said Heather Crawley, of Maryville, Tennessee, as she studiously photographed the orchids with a special lens on Thursday. “To think it’s natural, too.”
Visitors can also walk a half-mile trail.
The area is technically a fen because it’s less acidic than a bog and fed by groundwater containing nutrients like calcium and magnesium from the area bedrock, according to the Nature Conservancy, which owns and manages the preserve along with the New England Wild Flower Society. The sanctuary includes an 8-acre (3.2-hectare) wetland and 33 surrounding acres (13.4 hectares).
Other orchids also bloom, like yellow lady’s slipper in late May and early June and the white bog orchid around now.
The lime-rich groundwater also helps to yield pitcher plants, insectivorous sundew and other plants.
But the orchids are typically the main show for visitors.
“The orchids love it at Eshqua, and people love to see the orchids,” said Rose Paul, of the Nature Conservancy.
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The latest farm tools on the job in Pakistan are cell phones and satellites. A new program is using satellite data to estimate how much water a field needs, and then texting this information to farmers.
The hope is to prevent overwatering. A 2013 report from the Asian Development Bank called Pakistan “one of the most water-stressed countries in the world,” with a 30-day storage capacity, well below the recommended capacity of 1,000 days. The per capita water resources are on par with those of Syria, where drought has helped to fuel a civil war.
The water crisis is being driven by several factors: climate change, an expanding population, local mismanagement and a greater demand on farmers. It threatens to destabilize relations between Pakistan and India, who share the Indus River.
Turning off the spigot
Overwatering is costly for farmers trying to make ends meet. While Pakistan continues to suffer from chronic fuel shortages, farmers must use diesel motors to pump groundwater onto their fields. The lower the water table, the more fuel it takes to pump it to the surface.
And overwatering also reduces crop yields. But many older farmers learned their trade at a time when the water ran freely, and the risks of under-watering are so great that farmers still err on the side of too much irrigation. The Pakistan Council of Research in Water Resources (PCRWR) found that rice farmers were using more than three times as much water as they needed to.
The PCRWR reached out to the Sustainability, Satellites, Water, and Environment research group (SASWE) at the University of Washington, hoping to use science to inform irrigation choices.
Pakistan’s program started last spring with a 700-farmer pilot. As of January, 10,000 farmers were receiving messages like this one: “Dear farmer friend, we would like to inform you that the irrigation need for your banana crop was 2 inches during the past week.”
The messages come from a fully-automated system that does everything from downloading publicly available satellite data and distributing the text messages to using models to compute how much each farmer needs to irrigate.
A nationwide effort
PCRWR plans to scale up the program for use across the nation, and expects millions of farmers to participate. But first they are reviewing the system. They want to know how easy it is for farmers to use, and how many actually follow the irrigation advisories. And they want to know how accurate it is and how effective it is at saving farmers money.
They are collecting feedback from farmers over the phone.
“I haven’t seen any report yet,” Faisal Hossain of SASWE told VOA, but “we got a story last month from one of the farmers who was telling us how he was able to get, I think, for every acre 700 kilograms more of wheat than his neighbor.” The farmer credited the irrigation advisories.
There are challenges to expansion. They may need to do more work to persuade farmers to trust the technology. As more farmers use it on smaller farms in areas with more varied terrain, the satellite data resolution may not be precise enough for accurate measurements. And small farmers may not be comfortable relying on cell phone technology.
But for the most part, cell phones already are fairly ubiquitous in Pakistan. Last year, the Punjab government reported that it would be giving out 5 million smartphones to farmers.
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