Intensive subsistence farming is characterized by high output per unit of land but low output per worker. It is best developed in the monsoon lands of Asia, including China, Japan, India, and parts of Southeast Asia. Farming must be very intensive to support the high population densities in these regions, with small plots of land sometimes supporting 5-10 times as many people as similar plots in the US. Farming is intensive, utilizing all available land through double- or triple-cropping of rice or other crops like wheat. It relies heavily on manual labor and organic fertilizers to maintain high yields. Rice is the dominant crop where conditions allow, though other grains like wheat or millet are grown depending on local conditions.