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| DOI：10.13522/j.cnki.ggps.20180274 |
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| Uptake of Basal Application Nitrogen by Rice from Black Soil under Water-saving Irrigation in Temperate Region |
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CHEN Peng，ZHANG Zhongxue，CHEN Shuaihong，NIE Tangzhe，ZHAO Jian
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1. School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China; 2. Key Laboratory of Agricultural Water Resource Use, Ministry of Agriculture, Harbin 150030, China
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| Abstract: |
| 【Objective】Nutrient use efficiency depends on soil type and fertilizer application and the purpose of this paper is to study the uptake of basal-applied fertilizer by rice from black soil under different irrigations in temperate regions. 【Method】 The experiments were conducted in field plots and isotope 15N was used in the basal fertilizer to track transformation and uptake of nitrogen by rice under different irrigation methods, with traditional flooding irrigation as the control.【Result】Compared with flood irrigation, the controlled irrigation effectively increased accumulation of both dry matter and nitrogen in the rice, but had a low uptake of the basal-applied fertilizer. Recovery of the basal nitrogen at tillering, jointing-booting, anthesis stage under the controlled irrigation was 0.86%~2.60%, 1.17%~3.27%, 15.18%~33.50% and 10.91%~24.39% respectively. Except for fertilizer application 85 kg/hm2 at the anthesis stage, the controlled irrigation reduced nitrogen accumulation and recovery of the basal nitrogen in rice but enhanced nitrogen leaching, compared to the controlled irrigation. Under the controlled irrigation, approximately 63.99%~72.90% of the total basal nitrogen was found in the panicle of rice at the mature stage under different nitrogen applications, higher than that under flood irrigation, indicating that the controlled irrigation increased uptake of the basal nitrogen by rice and the subsequent transformation to the spike, thereby increasing nitrogen use efficiency.【Conclusion】 Under the water-saving irrigation, basal application of nitrogen should be reduced in order to meet nitrogen requirement by rice in its early growth stage in order to reduce nitrogen loss and achieve the goal of saving water and reducing nitrogen emissions simultaneously. |
| Key words: rice; irrigation; basal nitrogen application; fertilizer-N recovery efficiency |
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