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Aerobic Rice's Yield Performance and Nitrogen Use Efficiency Under Various Nitrogen Fertilizer Rates

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  • Zaki Musa

    (Malaysian Agricultural Research & Development Institute (MARDI), Jalan Sultan Tengah, 93050 Kuching, Sarawak)

Abstract

Aerobic rice, a water-saving cultivation system rice could thrive well in rain-fed areas in Sarawak which lacks in drainage and irrigation system, with appropriate fertilizer management practices. Since nitrogen (N) as a major determinant factor in rice yield is required differently based on cultivation system, soil and other insitu conditions, a study was conducted to determine the optimum N fertilizer rate while assessing nitrogen use efficiency of aerobic rice in Lundu, Sarawak. Four N fertilizer rates (T1=0, T2=100, T3=200 and T4=300 kg N/ha) were tested with split application of urea (46% N) at 23%, 31%, and 46% at 5, 25, and 45 days after emergence (DAE) using MRIA1 variety. The findings indicated that an increase in N fertilizer of more than 100 kg N/ha had no discernible impact on yield. The highest yield recorded was 3.31 t/ha in T2 and decreased to 2.99 t/ha and 2.86 t/ha respectively in T3 and T4, while T1 recorded 1.12 t/ha. Meanwhile, significant differences in partial factor productivity (PFPN), agronomic efficiency (AEN), apparent recovery efficiency (REN) and physiological efficiency (PEN) were observed between the treatments with descending efficiency trends at higher N fertilizer rates. Optimum NUE values were recorded in T2 with PFPN = 29.30 kg/kg; AEN = 14.56 kg/kg; REN = 0.26 kg/kg; and PEN = 55.64 kg/kg. Therefore, it can be concluded that 100 kg N/ha is recommended for aerobic rice cultivation in Tanjung Purun, Lundu, as yield and NUEs were optimized.

Suggested Citation

  • Zaki Musa, 2023. "Aerobic Rice's Yield Performance and Nitrogen Use Efficiency Under Various Nitrogen Fertilizer Rates," INWASCON Technology Magazine(i-TECH MAG), Zibeline International Publishing, vol. 5, pages 44-49, June.
    • Handle: RePEc:zib:zitecm:v:5:y:2023:p:44-49
    DOI: 10.26480/itechmag.05.2023.44.49
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    References listed on IDEAS

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    1. Tuong, T. P. & Bouman, B. A. M., 2003. "Rice production in water-scarce environments," IWMI Books, Reports H032635, International Water Management Institute.
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