Organic farming: ● Organic farming is a form of agriculture that relies on techniques such as crop rotation, green manure, compost, and biological pest control. So, option 4 is correct. ● Since 1990 the market for organic food and other products has grown rapidly, reaching $63 billion worldwide in 2012. ● It excludes or strictly limits the use of various methods: ◦ Synthetic petrochemical fertilizers and pesticides. ◦ Plant growth regulators such as hormones. ◦ Antibiotic use in livestock. ◦ Genetically modified organisms. ◦ Human sewage sludge. ◦ Nano-materials ● It is for reasons including sustainability, openness, independence, health, and safety. So, options 1, 2 and 3 are NOT correct.