Vietnam's agriculture is dominated by rice cultivation. The North has 15% of Vietnam's arable land concentrated in the Red River Delta, allowing for 2-3 rice crops per year through irrigation. The South's main rice growing region is the Mekong Delta, with single-cropping and irrigation supporting year-round cultivation. Other key crops include coffee, tea, pepper, rubber, and cassava, which are important industrial and export products. Collectivization of agriculture occurred earlier in the North beginning in 1956, while the South began collectivization later in 1978 as part of five-year economic plans.