Title: Effects of Light, Nitrogen and Their Interaction on Grain Yield and Nitrogen, Phosphorus and Potassium Absorption in Japonica Super Rice
Abstract: A field experiment was conducted using japonica super rice Nanjing 44 and Ningjing 3 with two nitrogen fertilization levels(N10: 150 kg ha–1; N20: 300 kg ha–1) and three shading treatments(L1: no shading; L2: shading 20 days before heading; L3: shading 20 days after heading) to study the effects of light, nitrogen and their interaction on grain yield and NPK absorption. Results showed that yield under the same level of nitrogen fertilizer was L1L3L2. Compared with L1, L2 significantly reduced NPK accumulation from jointing to heading and at whole heading stage, mainly due to the significant decrease of the root oxidation ability of α-NA and root dry weight before heading, resulting in decreased root nutrient uptake capacity and the final yield decrease of 30.58%–35.26%. L3 significantly reduced NPK accumulation from heading to maturity and at whole maturity stage, mainly due to the significant decrease of the root oxidation ability of α-NA and root dry weight after heading. Although the root was gradual aging with the function declining after heading, resulting in the reduced effect on root system, nutrient absorption and yield in L3 than in L2, the final yield was still 10.91%–18.47% lower in L3 than in L1. Under L2 and L3 conditions, with increasing nitrogen level, the root oxidation ability of α-NA and root dry weight increased significantly, resulting in that NPK accumulation increased significantly in various stages from jointing to maturity, then the final yield and nitrogen use efficiency improved significantly. This indicated that nitrogen fertilizer could partially offset the impact of low light stress on NPK nutrient absorption and grain yield in japonica super rice
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 1
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