Evaluation of nitrogen use efficiency and N-supplying capacity on pomelo (Citrus grandis L. Osbeck) grown on alluvial soil in the Cuu Long Delta
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Abstract
The study was conducted to determine the nitrogen use efficiency (NUE) and the ability to provide nitrogen from alluvial soil for growing pomelo (Citrus grandis L. Osbeck) in the Mekong Delta. The experiment was arranged in a randomized complete block design including two treatments (NPK treatment: 673 N - 385 P2O5 -192 K2O g/plant and PK treatment: 0 N - 385 P2O5 - 192 K2O g/plant) and three replicates (3 plants for each replicate). The results showed that fruit yield was highest (39.1 kg/plant, N recovery efficiency of 53.8%) in the full NPK fertilization treatment and lowest in the PK fertilization treatment (18.5 kg/plant). Calculation results of the ability to supply nitrogen to pomelo trees in Chau Thanh, Hau Giang showed that alluvial soil had the ability to provide 49.6% of N and the remaining 50.4% from additional fertilizer sources for maximizing fruit yield.
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