Rice is a grain of rice that is found in much of Asia. Oryza sativa is a cereal that the world consumes as a food. Especially in Asia. According to data from 2010, rice is the third most cultivated cereal crop in the world. Secondary from wheat and corn
Rice is the most important cereal in nutrition and human calorie intake. Most corn is grown for other purposes. Rice accounts for more than one-fifth of the energy consumed by humans worldwide.
There is evidence that China is the origin of rice. It has found traces of 16,000-year-old wild rice and 9,000-year-old rice by examining burnt-out rice specimens attached to scrap, as well as ancient grain fragments. Excavated from two caves in the Nanchang Valley, the capital of Jiangxi Province.
Evidence shows that rice was planted from 8,200-13,500 years ago in China's Zhujiang River valley region. Rice is grown in the Yangtze River valley in China. Rice spreads from East Asia to Southeast Asia and South Asia. Rice was brought to Europe through West Asia. And America through the seizure of European colonies.
Normal rice planting is yearly. But in the tropics. Rice can live for many years and can be ratoon for up to 30 years. The rice can grow up to 1-1.8 meters, depending on the variety and fertility of the main stem with slender leaves 50-100. Cm long and 2-2.5 cm wide. Inflorescence 30-50 cm long. The seeds can be eaten as cereal 5-12 mm long and 2 to 3 mm thick.
Rice cultivation is suitable for countries and regions with low wages and heavy rainfall. It is labor intensive to prepare the soil and needs enough water. However, rice can grow almost anywhere. Even on steep slopes or mountain ranges with stepped water systems. Although its primitive species are indigenous to Asia and the exact part of Africa Hundreds of trade and exports make it common in many cultures around the world. The traditional way to prepare the soil for rice is to make the floods transient for a while or after the setting of the young seedlings. This simple approach requires strong planning and service of the dam and rakes. It reduces the development of seed that is not strong and weeds without drowning growth. And inhibit pests. While flooding is not required for soil preparation for rice cultivation. All the ways in irrigation require more effort in controlling weeds and pests during growing periods and different ways of fertilizing the soil.