Effect of nitrogen (NH4 NO3) supply on absorption of ammonium and nitrate by conventional and hybrid rice during reproductive growth |
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Authors: | Ancheng Luo Jianming Xu Xiaoe Yang |
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Institution: | (1) Department of Soil Science and Agricultural Chemistry, Zhejiang Agricultural University, 310029 Hangzhou, China |
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Abstract: | Although NH4
+ has generally been accepted as the preferred N source for fertilising rice, some workers have concluded tha NO3
- is as effective as NH4
+. The present glasshouse study exmined the relative uptake of NH4
+ and NO3
- from solution and cultures containing 5–120 mg N/L supplied as NH4NO3 by a hybrid rice (India) and a conventional rice cultivar (Japonica). At all levels of N supply, the hybrid rice had higher leaf area and higher rates of uptake of total N than the conventional cultivar. Net photosynthesis rates were similar for both cultivars at the highest rates of N supply, but were lower at 5–40 mg N/L for the hybrid cultivar than for the conventional cultivar. At all levels of N supply, the conventional rice cultivar absorbed more NH4
+ than NO3
-. In contrast, the hybrid rice absorbed more NH4
+ than NO3
- at the low levels of N supply (5–40 mg N/L), but more NO3
- than NH4
+ at the high levels of at 80 and 120 mg N/L. It is concluded that the uptake of N by rice is under genetic control and also dependent on levels of N supply. Thus the appropriate form of N fertiliser for rice may depend on cultivar and rates of N supply. |
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Keywords: | ammonium conventional rice hybrid rice nitrate N uptake solution culture |
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