Manure has become a minor source of nitrogen in all major agricultural countries.

在主要的农业国家动物粪便已经不是氮肥的主要来源。

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The liquid manure is still a major source of environmental pollution, although the way of separating solid and liquid manure reduces the environmental effect in certain extent.

虽然采取固体粪便与液体粪水相分离的方法在一定程度上减少了对环境的影响，但液体粪水仍是污染环境的主要来源。

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Studies were conducted on the changes of physicochemical quality of sawdust substrates using urinate as manure source during fermentation and the effect on growth of pepper seedling.

研究了以尿素为氮源的锯末基质发酵腐熟过程中理化性质的变化以及对辣椒幼苗生长发育的影响。

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It results from the 1.6 billion people that do not have any access to electricity whatsoever, the 2.4 billion that have almost no access to electricity and still burn wood and manure as their main source of energy, and the 3 billion new people that will be born by mid-century who will need electricity.

FORBES: What Is Our Energy Future?