Cultivation and improvement of Rice
Origin of Rice:- 1. Introduction :- · Common Name:- Paddy, Rice · Botanical Name:- Oryza sativa · Family:- Poaceae or Gramineae · Chromosome Numbers:- 2 n = 2 x = 24 2. Species :- Genus Oryza has total 24 species. 22 species are wild and 2 species are cultivated. Cultivated species are:- a. Oryza sativa:- · This is main cultivated species. · It is cultivated all over the world. · It has 3 main sub - species:- i. indica:- In warm areas ii. japonica:- In cold areas iii. javanica:- In intermediate areas (In Indonesia) · Above mentioned sub - species have morphological, physiological and genetic variations. b. Oryza glaberrima:- · It occurs in warm areas. · It is cultivated in West Africa. · ...