年复一年他们重复种同样的农作物，耗尽了土里的营养。
They also plant the same crop year after year, depleting the nutrients in the soil.
攀西地区下湿田增种早春作物，是充分利用春季光温资源，提高复种指数的有效措施。
Increasing planting early crops on the wetland is an effective measure to fully utilize the spring season resources of temperature or light and raise multiple crop index.
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.
作物复种方式不断优化，复种指数呈波动式增长。
Multi-cropping optimized and cropping density increased in wave.
作物复种方式不断优化，复种指数呈波动式增长。
Multi-cropping optimized and cropping density increased in wave.
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