在北美西部，大多数农业活动已被速生针叶树的单一栽培所取代。
In western North America, most have been replaced by monocultures of fast-growing conifers.
结果表明，稻曲螟的危害是单一栽培稻田的2-3倍。
The damage of Chilo suppressalis was about 2-3 times of that in monoculture paddy-field.
但随着小麦栽培品种单一化导致基因大量流失，使其遗传基础日益狭窄和抗源匮乏，对其产量和品质的进一步改良起着极大的限制作用。
However, the narrow genetic basis of wheat has limited the further improvement of yield and quality, which is essential to maintain the increasing population.
描述了稻瘟病害在寄主单一和混合栽培条件下的发生规律。
Rice blast disease in the host populations of pure and mixed stands of rice varieties was studied and described.
描述了稻瘟病害在寄主单一和混合栽培条件下的发生规律。
Rice blast disease in the host populations of pure and mixed stands of rice varieties was studied and described.
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