The main object of crop cultivation research is（）.

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• Which continent in the world has the largest area of rice cultivation?
• The type of corn suitable for current dense planting high yield cultivation is　 （）.
• There are some differences in crop species and technical level in different regions， because of the （）results of crop cultivatio
• Different crops are planted in different seasons because of the （）results of crop cultivation.
• A key belief of（）was that humans are innately good, but this quality requires cultivation and the right environment to flourish.