举个极端的例子，以单一作物为主的农田是如此不稳定，一年的坏天气或单一害虫的入侵可以摧毁整个作物。
To take an extreme example, farmlands dominated by a single crop are so unstable that one year of bad weather or the invasion of a single pest can destroy the entire crop.
他们不赞成种植单一作物和使用化肥。
但给单一作物传播花粉威胁这昆虫的健康吗？
But does pollinating monocultures threaten the insects' health?
直到今天，村民们仍过着原始的单一作物经济的生活。
Even today the villagers live in a primitive one-crop economy.
但是中国最近的大型农业公司纷纷从国有到逐利的私营实体转变，这样会使得现在大型、单一作物为主农场的趋势更难扭转。
But the recent shift of China's larger agricultural companies from state-owned to profit-driven private entities will make the current trends toward large, mono-crop farms more difficult to reverse.
因为它们经常会被迫向一种单一的作物传粉，所以它们可能无法摄入维持健康所需的所有营养。
Since they're often forced to pollinate one specific crop, they may not get all the nutrients they need to be healthy.
他把玉米和大豆单一种植的产量和把两种作物交互条播的产量进行了比较。
He compared the yield of solid plantings of corn and soybeans with alternating strips of the two crops.
红壤长期施用单一化学肥料，土壤明显酸化，土壤交换性氢铝显著增加，作物生长变差，产量降低。
The soil became acid obviously, the exchangeable al in soil increased significantly, crop grew poorly and the yield decreased after applying sole chemical fertilizer for long term.
它将单一经营的出口农作物生产代替了传统的多元生农业，需要地方的自给自足。
It replaces the traditional polycultures, required for local self-sufficiency, with monocultures producing crops for export.
所有这些改进都来自一个单一的变化-一个更大的1.5倍作物传感器。
All these improvements come from one single change - a larger 1.5x crop sensor.
单一做法，可以将复种轮作系统的使用，边界，覆盖作物。
Monoculture practices can incorporate multiple cropping systems by using rotations, borders, and cover crops.
但是番薯等高产作物也有其弱点：营养低且单一、味道差，可深加工的价值少。
However, high-yield crops such as sweet potato also has its weaknesses: nutrition, low and single, taste bad, may be less the value of deep processing.
但是专家表示没有一种单一的农作物可以给非洲农业带来根本性的变化，因为那里的农民混合种植不同的农作物。
But experts asid no single crop will revolutionize farming in Africa. Because farmers there grow a mixture of different crops.
但是专家表示没有一种单一的农作物可以给非洲农业带来根本性的变化，因为那里的农民混合种植不同的农作物。
But experts say no single crop will revolutionize farming in Africa because farmer there grow a mixture of different crops.
但是专家表示没有一种单一的农作物可以给非洲农业带来根本性的变化，因为那里的农民混合种植不同的农作物。
But experts say no single crop will revolutionize farming in Africa because farmer there grow a mixture of different crops.
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