Classification of rice

1. Based on subspecies: Indica, japonica and japonica
2. Based on growing season :

i. Spring rice / Chaite rice :

• The yield of this rice is higher due to more number of sunny days, and better fertilizer use efficiency (due to controlled water and less weed infestation.
• Important varieties are CH-45 , chaithe-4 , chaithe-6 , hardinath 1 , hardinath2 , etc.

ii.  Upland rice / ghaiya :

• Its recommended modern var. are ghaiya-1, ghaiya-2, and Bindheshwary and its indigenous varieties are true, Bijhani, etc.

   iii. Main season rice :

• Both photoperiod sensitive and insensitive var. are present.
• Indigineous var. are Anandi, Masina, Pokherili masino
• Recommended var : Savitri, sunaulo sughandha , loktantra , Ramdhan , etc.

iv. Boro rice/ winter rice :

• Coarse rice and the quality of juice is poor.
• Require a longer period during the seedling stage because of the dormant nature of varieties.
• Not common in Nepal, few farmers are starting to grow boro rice in the Morang and Jhapa district of Nepal.

3. Based on the water regime :

i. Irrigated wet season rice :

• Irrigated low land condition
• Seedlings prepared in the nursery bed and transplanted in bundled puddled condition.
• Irrigation to supplement dams.
• Modern semi-dwarf varieties and traditional tall varieties are grown in such conditions.

ii. Irrigated dry season rice (chaise rice):

• Similar to wet season rice where crops depend on irrigation, modern semidwarf varieties are grown under the situation.

iii. Shallow ranfed rice :

• Rice is transplanted in bundle and puddle condition.
• water depth is maintained from 0 to 10 cm from tillering to flowering.
• Modern semi-dwarf traditional tall varieties are grown under this situation.

                   Rice has a total of 95 varieties till fiscal year 2072/73.

a)Released varieties: 62

b)Registered varieties: 33

c) Denotified varieties: 12

            Denotified variety of rice are : khajura-2 , Barkhe-2 , Durga , Laxmi , jaya , IR-8 , IR-20.