What are the classifications of rice in the United States?

The history of rice cultivation is only over 300 years, and early rice varieties are all introduced from Asia. The rice planting area in the United States accounts for about 10% of the cultivated land area and 1.7% of the world rice planting area. The planting area of rice is small, only about 6.5438+0.3 million hm2, but the yield per unit area is above 7t/hm2. Because wheat is the main edible grain, rice is exported in large quantities, and it is one of the major rice exporters in the world.

Rice varieties are divided into three types according to grain type: long grain type, medium grain type and short grain type. Long-grain varieties used to be considered as indica rice because they looked like indica rice. After modern biotechnology determination and quality identification, it is considered to be a long-grain japonica rice. Because the stems, leaves and shells of this variety are smooth and hairless, it is also called American naked-shell rice. The planting area of long-grain varieties is over 75%. Short grain type belongs to japonica rice. The medium-grain variety is also japonica rice. The growth period is generally divided into extremely early maturity (100 ~ 1 15d), early maturity (1 16 ~ 130d) and medium maturity (13/kloc-0).

The remarkable characteristics of rice planting in the United States are: first, the degree of mechanization and farm is high, achieving high efficiency and low cost; Second, pay attention to quality and take quality improvement as the primary goal of breeding. Its high-quality rice not only meets the needs of the domestic market, but also adapts to the competition in the international market.