Wetland rice or paddy soils offer the staple diet for nearly the world's population. Worldwide, the full harvested rice space covers around one hundred fifty million hectares, and around ninetieth of this rice space is settled in Asia, with an analogous share in rice production. The flooded soil surroundings is one in every of the particular characteristics related to rice cultivation of the normal rice-growing areas within the watercourse deltas of China, geographic region, and therefore the Indian landmass. The term ‘paddy soil’ doesn't describe a particular soil sort however rather denotes soils in lowland rice production systems with a chronic amount below immersion. ‘Water regime’ is employed to classify the surroundings of paddy soils into broad ecosystems, distinctive irrigated and rainfed rice adult preponderantly within the lowlands, upland rice adult within the uplands below aerated soil conditions, and deep rice in flood-prone watercourse deltas and coastal areas.