Edible beans are the main food crops in the world. According to FAO statistics, although the cultivated area of crops in the world has gradually decreased in the past 4 years, the cultivated area of edible beans has steadily increased, and the total output has greatly increased (Table 1-2). The main producing countries of edible beans, in order of output: broad beans are China, Ethiopia, Egypt, Italy and the former Soviet Union; Peas are Indian, China, French and Canadian; Mung beans are Indian, China and Turkish; Adzuki beans are from China, Japan and South Korea; Cowpea is Nigerian, Niger, Indian and China; Common beans are Indian, Brazilian, China, Mexican and American; The Phaseolus vulgaris is Mexican, American, China, Colombian and Argentine; Lentils are from India, Turkey, Syria, the United States and Bangladesh; Chickpeas are from India, Pakistan, Turkey, Mexico and Myanmar; Pigeonpea is from India, Myanmar, Nepal, China, Malawi, Uganda and Kenya; The rice bean is China. From the above statistics, we can see that India and China are truly big producers of edible beans. In terms of area and yield, in 22, the top seven major edible legumes in the world were kidney beans, chickpeas, cowpeas, peas, cajanus cajan, lentils and broad beans (Table 1-2). In the past 4 years, the planting area and total yield of chickpea have remained basically stable; The planting area of kidney beans is basically stable, and the total yield has increased by 4% ~ 5%; The broad bean area decreased by 5% ~ 6%, and the total yield decreased by 2% ~ 3%. The pea area decreased by about 2%, but the total yield increased by 2% ~ 3%. The planting area and total yield of cowpea increased by 4 ~ 5 times; The planting area of lentils increased by 2 ~ 3 times, and the total yield increased by 3 ~ 4 times. The average annual growth rate of cajanus cajan area is about 1.28%, and the average annual growth rate of total output is .84%.

table 1-2 area and yield of main edible beans in the world (according to FAOSTAT)