They serve as a natural fertilizer and help support the roots of future crops.

这些植物就相当于自然的肥料，帮助将来的农作物强健根基。

Farmers enrich the soil with natural fertilizers.

化学肥料、杀虫剂和生长激素被禁止使用。农民用天然肥料丰富土壤。

Rain then delivers these nitrates to the ground as a natural fertilizer, nourishing plant life.

然后雨水将这些硝酸盐作为天然肥料输送到地面，滋养植物的生命。

Speaking of making use of our lands, livestock also contribute a very valuable resource for growing fruits and vegetables — natural fertilizer, manure.

说到利用我们的土地，牲畜也是种植水果和蔬菜的非常宝贵的资源——天然肥料、肥料。

They serve as a natural fertilizer and help support the roots of future crops. They take in rain and allow it to flow into the soil instead of running off.

这个小口子发挥着天然肥料的作用，而且能够帮助支撑之后种下的庄稼的根茎。它们盛纳了雨水并将其导入泥土中，而不是任其白白流走。

Because every time they erupt, they belch out rich minerals from deep within the Earth that eventually settle down into the soils below in the form of ash acting effectively like a natural fertilizer system.

因为每次火山爆发，它们都会喷出地球深处的丰富矿物质，这些矿物质最终以火山灰的形式沉淀到下面的土壤中，就像天然的肥料系统。

The result was a long but narrow flood plain, fueled with natural fertilizer and nearly infinite supplies of water that weren't dependent on unpredictable levels of rainfall that all ran through a very warm climate.

结果形成了一个狭长的洪泛平原，它拥有天然肥料和近乎无限的水源，而不依赖于不可预知的降雨量，并且气候非常温暖。