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0:00 division of agriculture 0:29 purpose of agriculture 0:37 subsistence agriculture 1:06 commercial agriculture 1:26 division according to intensity of agriculture 1:39 yields and harvests 3:20 intensive agriculture 4:48 extensive agriculture 10:13 types of agriculture 11:05 primary agriculture 11:38 hoeing 12:15 slash-and-burn agriculture 13:20 fallow-arable system 13:35 nomadic pastoralism / nomadism 14:03 traditional agriculture 14:48 fallow system 15:10 two-field farming 15:47 three-field farming 16:21 continuous cultivation / crop rotation 17:16 market agriculture