The adoption of herbicide-resistant crops could help improve water and soil quality by reducing the need for tilling.
They found that the height of a panel and soil quality had the most potential impact on stone deterioration.
As well as questions from the audience about soil quality and slugs, there were others about coping with depression.
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Farmers plant a warm-season perennial grass and fallow the field for two years, improving soil quality and water-holding capacity.
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He said the soil quality on the new site was not yet known but there had been a suggestion it had previously been used as arable land.
It comes from a garden wholesaler, which provides the high quality soil, taken deep beneath the earth's surface -- 10 meters down, in fact.
On tiny plots, and often poor-quality soil, without modern equipment or farming methods, and sometimes beset by land disputes, many peasant farmers struggle to feed their family and grow just a little extra to sell in the village market.
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Wineries are using iPads in their vineyards to the call up weather data and soil profiles, record quality assessment and make decisions on the spot about whether to harvest their grapes.
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The scheme is an agri-environment scheme, which provides funding for farmers to manage their land in a way designed to benefit biodiversity and landscape features and improve the quality of water and soil.
Zoning laws would be rewritten so that, over time, large parcels of abandoned land would be converted into landscaped open space networks that would capture and clean storm water, improve air quality, and clean contaminated soil as well as provide new recreational opportunities like bike paths and hiking trails and create habitats for local wildlife and migrating birds.
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It published on Monday, for the first time, environmental quality standards setting acceptable limits for contaminants in soil.
These changes are making water supply and quality more difficult to obtain, affecting runoff and soil moisture, increasing water temperatures, decreasing snowpack and lake and river ice, threatening fish and aquatic species, and allowing saltwater intrusion and sea level rise.
One interesting pilot scheme being tried out in Minnesota allows farmers who reduce fertiliser run-off and soil erosion to enjoy an exemption from future state and federal water-quality standards.
After 90 days, a high-quality organic compost is ready for landscapers, farmers and gardeners to fertilize their soil.
The problem at present, he says, is that North Korean farmers plant too many poor-quality seeds in a desperate attempt to boost crops, and do so in soil that is becoming increasingly less fertile.
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