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| DOI：10.13522/j.cnki.ggps.20180307 |
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| Effect of Irrigation and Nitrogen Application on Growth of Two Rice Cultivars at the Tillering Stage |
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TIAN Guangli, LI Dongwei, ZHEN Bo, LI Huizhen, ZHOU Xinguo
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1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 2. Shangqiu Farmland Ecological System State Field Observation Research Station, Shangqiu 476001, China
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| Abstract: |
| 【Objective】 Physiological development of plants is regulated by soil water and nutrients and the aim of this paper is to study how irrigation and nitrogen application combine to affect growth of two rice cultivars at tillering stages with view to provide a guidance to their sustainable production. 【Method】 The experiment was conducted in pots and the two cultivars studied were the early-mature japonica rice Wujing 04136 and the early-mature hybrid Y Liangyou 3218. For each cultivar, we considered three nitrogen fertilizer applications:100 kg/hm2 (N100), 200 kg/hm2 (N200) and 300 kg/hm2 (N300); and three irrigations schedules: Alternate wetting-drying irrigation (AWD), shallow-water flood irrigation (SW), and humid irrigation (HI). When the tillering of the rice reached maxima, plant traits and soil properties in each pot were measured. 【Result】 Compared to irrigation, nitrogen fertilizer application had more significant impact on biomass, tiller number, plant height, soil ammonium and nitrate content, activity of root, plant leaf, sheath and nitrogen concentration in roots. Both nitrogen fertilizer application and irrigation had noticeable effects on sap flow in roots, but insignificant impact on leaf aging.【Conclusion】 The influence of irrigation and nitrogen on growth of the two rice cultivars during the tillering stage varies and the underlying mechanisms require further investigation. |
| Key words: irrigation schedule; nitrogen fertilizer application; rice; growth traits |
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