Different methane production rates are found in the paddy fields treated by different fertilizers and rice varieties.

在不同施肥及水稻品种的稻田土壤中也观测到不同的甲烷产生率。

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Prior to the mid-1980's, methane from coal seams was classified as an uneconomic resource - one of vast potential, but low value due to poor recovery rates and high associated water production.

在此之前的1980年代中期，从煤层甲烷被列为非经济资源-一个潜在的巨大的，但由于贫困低价值和高回收率有关水的生产。

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