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Abstract

Birsa Dhan 201 and Birsa Dhan 202: early-maturing varieties for Bihar, India.

Abstract

Derived from the crosses TN1/Brown Gora 23-19 and Jaya/BR34, respectively, the rice cultivars Birsa Dhan 201 and Birsa Dhan 202 were re-released in 1995 for use in the Chotanagpur and Santhal Parganas region of Bihar, India. Birsa Dhan 201 is an early-duration variety that matures in 105-110 days under transplanting. It is non-lodging, non-shattering and highly responsive to chemical fertilizers, yielding 3.0-3.5 t/ha. It has compact, long panicles with bold grains and white kernels, and is moderately resistant to blast [Magnaporthe grisea], bacterial leaf blight [Xanthomonas oryzae], stem borer [Scirpophaga incertulas] and gall midge [Orseolia oryzae]. Birsa Dhan 202 is intermediate in plant type and provides adequate rice straw for cattle feed. It has good seedling vigour and heavy, drooping panicles. It is stiff-strawed and resistant to lodging. The grains are long and bold, producing white kernels, and it is moderately resistant to M. grisea, S. incertulas and X. oryzae, and moderately susceptible to O. oryzae. It produces 5-6 t/ha when 40-60 kg N/ha is applied. Both varieties have acceptable taste, grain and cooking quality.