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The correct answer is 1, 2 and 4.
Permaculture farming discourages monocultural practices as it promotes the diversity of crops in a farm which helps to improve soil fertility and prevent pest outbreaks. On the other hand, conventional chemical farming often relies on monoculture practices that can lead to soil depletion, loss of biodiversity, and pest outbreaks.
Conventional chemical farming can cause an increase in soil salinity due to the overuse of chemical fertilizers and irrigation, which can lead to soil degradation and reduced crop yields. Permaculture farming, on the other hand, emphasizes the use of natural fertilizers and conservation of water resources, which helps to prevent soil salinization.
Conventional chemical farming can be practiced in semi-arid regions using irrigation and chemical fertilizers to enhance crop productivity. Permaculture farming, however, requires careful water management and soil conservation practices that may not be easily feasible in semi-arid regions.
Mulching is an essential practice in permaculture farming, as it helps to conserve soil moisture, suppress weeds, and enhance soil fertility by adding organic matter. In conventional chemical farming, mulching may not be as important as the focus is more on the use of chemical fertilizers to enhance crop productivity.