Growth and yield of new rice for africa (NERICAs) under different ecosystems and nitrogen levels

Maya Matsunami, Toshinori Matsunami, Makie Kokubun

    Research output: Contribution to journalArticle

    25 Citations (Scopus)

    Abstract

    Scarcity of water and N fertilizer are major constraints to rice production, particularly in developing countries where rainfed upland condition dominates. Improvement of genetic adaptability to inadequate water and N fertilizer is one option to maintain productivity in these regions. NERICAs are expected to yield higher under low input conditions, but growth and yield responses of the cultivars to different ecosystems and N levels remain unknown. The objectives of this study were to characterize the growth and yield performance of NERICAs, in comparison with selected Japanese rice cultivars. The two NERICAs (NERICA 1 and NERICA 5), two Japanese upland cultivars (Toyohatamochi and Yumenohatamochi), and a Japanese lowland cultivar Hitomebore were grown under two ecosystems (irrigated lowland (IL) and rainfed upland (RU)) with two N levels (high (H) and low (L)) for two years. The cultivar difference in the aboveground dry weight and grain yield was the largest in the in RU×L plot, where the values of NERICAs were similar to those in the other plots, but the values of other cultivars were substantially reduced. Regardless of cultivar, N contents of the plants at maturity correlated significantly with the aboveground dry weight at maturity, spikelet number and grain yield per area. These results indicate that NERICAs, compared with the selected Japanese upland cultivars that were bred for drought tolerance, have a higher ability to absorb N under upland conditions, which may contribute to higher biomass production and sink formation, resulting in increased gain yield.

    Original languageEnglish
    Pages (from-to)381-389
    Number of pages9
    JournalPlant Production Science
    Volume12
    Issue number3
    DOIs
    Publication statusPublished - 2009 Jul 29

    Keywords

    • Growth
    • Irrigated lowland
    • NERICA
    • Nitrogen absorption
    • Nitrogen level
    • Rainfed upland
    • Rice
    • Yield

    ASJC Scopus subject areas

    • Agronomy and Crop Science

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