Nitrogen Use Efficiency of Upland Rice in Northwest Region

Received: 15-09-2015

Accepted: 29-11-2015

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Issue: Vol. 13 No. 8 (2015)

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NÔNG HỌC

How to Cite:

Khoa, N., & Cuong, P. (2024). Nitrogen Use Efficiency of Upland Rice in Northwest Region. Vietnam Journal of Agricultural Sciences, 13(8), 1333–1342. http://testtapchi.vnua.edu.vn/index.php/vjasvn/article/view/242

Nitrogen Use Efficiency of Upland Rice in Northwest Region

Nguyen Van Khoa (*) 1 , Pham Van Cuong 2

  • 1 Khoa Nông Lâm, Trường Đại học Tây Bắc
  • 2 Khoa Nông học, Học viện Nông nghiệp Việt Nam

    • Keywords

    Grain yield, nitrogen, nitrogen use efficiency, physiology efficiency, upland rice

    Abstract


    The efficiency of nitrogen fertilizer in upland rice variety “Nếp nương tròn” and the control variety LC93-1 was evaluated in a nethouse pot experiment at Tay Bac University in Son La city. The pots were filled with 5 kg of upland soil. Plants of two varieties were fertilized with five levels of nitrogen: 0 mgN/pot (N0), 200 mgN/pot (N1), 400 mgN/pot (N1), 600 mgN/pot (N3), and; 800 mgN/pot (N4). The experiment was designed in randomized complete blocks with three replications, each replication consisting of 3 pots. The result showed that increased amount of nitrogen fertilizer from 0 mg/pot (N0) to 800 mg/pot (N4) increased plant height, number of panicles/hill, number of filled grains/panicle, biomass and grain yield in both varieties. Increased level of nitrogenous fertilizer led to apparent increased nitrogen concentration in stems and leaves but litle in grains. However, the amount of nitrogen absorbed by stem, leaves and grains and the total amount of nitrogen increased with the increased level of nitrogen fertilizer applied. Nitrogen use efficiency (NUE), agronomic efficiency (AE), physiological efficiency (PE) and utilization efficiency (UE) of two varieties declined with increased amount of nitrogenous fertilizer. Highest utilization efficiency (UE) was obtained at low nitrogen level.

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