Chilling Unit Zonning for the Development of Temperament Fruit Trees in Highland Communities, Thai Nguyen, Vietnam

Nguyen Van Toan, Nguyen Vo Linh, Nguyen Van Chien, Nguyen Vo Kien, Ngo Thi Be, 

Le Nam Phuong, Nguyen Van Cuong, and Hoang Thi Thu Thom

Institute for Agricultural and Rural Planning Research, Vietnam

 Abstract: Thai Nguyen is located in the subtropical region, some regions are strongly influenced by the northeast monsoon, so the chilling unit is higher than some other regions. Temperate fruit trees (pears, persimmons, plums), annual trees that need a certain degree of chilling unit in the winter to differentiate flower buds, this requirement makes the above fruit tree species only suitable for growing in cold climates. high mountain areas in Vietnam. Zoning the accumulated chilling unit is a decisive step in determining areas to develop temperate fruit trees in highland communes, Thai Nguyen, Vietnam. Total area with chilling unit > 150 cu where temperate fruit tree varieties can be grown in highland communes: 75,312.37 hectares (accounting for 46.53% of total natural area): Very little cold region: 44,710, 7 hectares (accounting for 59.3%), it is recommended to test pear, persimmon, and plum; Less cold region: 20,687.83 hectares (accounting for 27.47%), it is recommended to grow pears, persimmons, and plums; Medium cold region: 6,315.64 hectares (accounting for 8.39%), recommended planting pears, persimmons, plums; Cold region: 3,598.2 hectares (accounting for 4.78%), recommended planting pears, persimmons, and plums. The focus region for developing fruit trees in terms of Chilling unit is Vo Nhai district, Dong Hy district, Phu Luong district.