许多人试图通过减少灌溉频率或改种需水量更少的作物来节约用水。
Many have been attempting to conserve water by irrigating less frequently or by switching to crops that require less water.
更糟糕的是，非洲和印尼、委内瑞拉等其他可可生产国的许多可可种植者正在改种玉米或橡胶等更容易种植的作物。
What's worse, many cocoa farmers in Africa and other cocoa producing countries like Indonesia and Venezuela are changing to easier to grow crops such as corn or rubber.
农场主们打算将玉米田改种牧草。
丈夫开始有怨言，想改种果树。
The husband begins to have complaint, think replant fruiter.
价格下滑迫使许多农户改种其他作物或者迁往城市。
The slump forced many small farmers to switch to other crops, or migrate to cities.
作者警告说，全世界并没有足够多的耕地都改种玉米和大豆。
The authors warned there just was not enough cropland available to shift to corn and soybeans.
最近一次的降雨可能会阻止今年部分土地播种或改种大豆。
The latest round of rain likely will prevent some land from getting planted or replanted to soybeans this year.
由于农民为增加收入而改种经济作物，农业生产方式正在转变。
As farmers turn to cash crops to increase their income, the mode of agricultural production is changing.
并且还提到，他不得不改种利润较少的高粱，因为鸟类不以它为食。
I always chose to grow sunflowers but I can't anymore, "said Dominguez, adding that he was forced to switch to less-profitable sorghum because the birds do not feed on it."
种植水稻的机会成本是没有种植其他作物的损失，如不种水稻而改种胡萝卜。
The Opportunity Cost of producing the rice is the loss in production of another crop, such as carrots, that could have grown instead of the rice.
如果我们把城市里的高楼大厦的热烘烘的房顶都改种草木改建成花园，那会怎样？
But what if we could replace the hot roof of each skyscraper or building in a city with grass or a garden?
万物生长的季节已然变短，迫使农夫放弃棉花改种稻米，但这却需要抽更多的水。
The growing season there is now shorter, causing many farmers to switch from cotton to rice, which demands even more diverted water.
就整个世界而言，将10%的高度易侵蚀农田改种草或树似乎是一个合理的目标。
For the world as a whole, converting 10% of cropland that is highly erodible to grass or trees seems a reasonable goal.
印度许多油籽种植者正在改种小麦等其它作物，对此，最近印度油籽业表示担心。
India's oilseed sector has recently expressed concerns that many farmers are shifting to other commodities such as wheat.
而有机耕作的农民们坚持每隔两到三年换种农作物。例如，种玉米或小麦后再改种豌豆或大豆。
Instead, organic farmers insist on changing crops every two or three years, for example, corn or wheat followed by peas or soybeans.
研究者们分析了已出版的，有关在野地和农田里改种燃料作物后，土壤中有机碳的变化的评估。
The researchers analyzed published estimates of changes in soil organic carbon in landscapes converted from natural or agricultural land to biofuel crops.
在同一块地里，他们经常每隔几年就换种农作物。例如，种玉米和小麦后来年再改种豌豆或大豆。
They often change the kind of crop in each field every few years, for example, growing corn or wheat and then the next year peas or soybeans.
因此，许多农场主让土地休耕，或不再种植棉花一类需水量大的作物，而改种那些需水量更小的作物。
As a result, many farmers are letting their fields lie fallow or switching from thirsty crops, such as cotton, to those that need less.
市场价格走高，将激发供给，从而激发生产；市场价格走低，可能引发矿厂检修、耕地改种其他作物。
A market price well above that level will cause new supply to be brought on stream; too low a price will cause mines to be mothballed or arable land to be switched to other crops.
改种有机棉花具有重要意义，因为该种棉花作物杀虫剂使用量仅为全球棉作物杀虫剂使用量的25%。
Switching to sustainable cotton is important because this type of crop accounts for 25% of pesticides used in the world.
随着蓄水层的枯竭和灌溉井的干涸，农民不得不改种低产的旱地作物，在更为干旱的地区，他们干脆放弃耕作。
As aquifers are depleted and irrigation Wells go dry, farmers either revert to low-yield dryland farming or, in the more arid regions, abandon farming altogether.
为了减少或消除干旱所造成的各种危害和损失，四川必须进一步采取蓄水、改种、兴林等综合配套的防治措施。
To reduce and eliminate the damage and losses of all kinds, Sichuan Province must adopt comprehensive prevention and remedy measures of water-retaining, cultivation-changing and forestation.
为了减少或消除干旱所造成的各种危害和损失，四川必须进一步采取蓄水、改种、兴林等综合配套的防治措施。
To reduce and eliminate the damage and losses of all kinds, Sichuan Province must adopt comprehensive prevention and remedy measures of water-retaining,...
方法之一就是鼓励开发未失水泥炭的沼泽地，比如，改种喜温的橡胶树而不种油棕榈树，因为橡胶树需要干土生长。
One approach might be to encourage uses of marshland that do not desiccate the peat—for example, growing moisture-loving rubber trees rather than oil palms, which need dry soils.
布鲁塞尔一再崔促种植户通过修耕500公顷以及改种能够酿造更高质量更昂贵的葡萄酒的葡萄品种来降低成本。
Brussels has repeatedly urged growers to cut costs by letting nearly 500,000 acres of land lie fallow, and swap plonk production for more expensive, higher quality wine.
不过农夫们因应这种新的市场标志，改种不那么吃水的作物，仍然维持著农田产出的价值稳定，水源生产力甚至翻了两倍。
Yet farmers have responded to the new market signals by switching to less thirsty crops and kept the value of farm output stable. Water productivity has doubled.
“还是在同样的地方种同样的东西——我们说的只是改种那些你正在种着的玉米或者大麦的不同品种，一些具有更高反射率的品种。”他说。
"The same crops are grown in the same location – all we're talking about is planting a variety of wheat or maize that you already grow, a variety that has slightly increased reflectivity, " he said
“还是在同样的地方种同样的东西——我们说的只是改种那些你正在种着的玉米或者大麦的不同品种，一些具有更高反射率的品种。”他说。
"The same crops are grown in the same location – all we're talking about is planting a variety of wheat or maize that you already grow, a variety that has slightly increased reflectivity, " he said
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