The two challenges to implementing sustainable farming practices from the options provided are:
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Higher initial costs - Sustainable farming practices often require significant investment in materials, technology, and training, making the initial costs a barrier for many farmers.
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Increased labor costs - Implementing sustainable practices often requires more manual labor for tasks such as crop rotation, organic pest control, and maintaining biodiversity, which can lead to higher labor costs.
The other options, while relevant to agricultural practices, are not specifically challenges tied to sustainable farming implementation in the same context.