| 肥料和稻草氮利用率的三年定位研究 |
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| 引用本文： | 王胜佳,王家玉,陈义.肥料和稻草氮利用率的三年定位研究[J].土壤通报,2004,35(6):763-766. |
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| 作者姓名： | 王胜佳 王家玉 陈义 |
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| 作者单位： | 浙江省农业科学院,土壤肥料研究所,浙江,杭州,310021 |
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| 基金项目： | 本文受联合国FAO/IAEA"持续农业与环境保护下土壤有机质管理与养分循环"(编号:CRP-8896)项目资助 |
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| 摘 要： | 对氮肥和稻草氮的利用率进行了3年6季同位素15N田间定位研究。结果表明,首季单季水稻对氮肥的利用率为37.02%,050cm土壤中15N的残留率为25.81%。经过连续3年6季的种植,作物肥料N的累计回收率分别为40.15(秸杆还田)41.63%(秸杆不还田),050cm土壤中15N的残留率仍达到23.62(秸杆不还田)28.33%(秸杆还田)。在不施氮肥条件下,小麦对稻草氮的吸收率为4.46%,第二季单季稻对稻草氮的吸收率为4.78%。5季作物累计吸收稻草氮11.76%,而土壤残留率为70.37%。
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| 关 键 词： | 氮素 稻草 15N示踪 氮肥回收率 |
| 文章编号： | 0564-3945(2004)06-0763-04 |
| 修稿时间： | 2003年8月20日 |
A Three -year Research on Nitrogen Recovery of Chemical Fertilizer and Rice Straw by Isotope 15N in Rice Fields |
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| Abstract: | A three-years,experiment for nitrogen recovery of chemical fertilizer and rice straw by isotope ~(15)N was conducted under field condition. The results showed that ~(15)N recovery in the first crop of single late-rice was 37.02%,the ~(15)N residue rates was 25.81% in 0~50cm soil.The ~(15)N recovery in second season crop of winter wheat was 1.55% for treatment with straw return and 2.08% for that no return,respectively. The accumulated ~(15)N recovery in continuous six season crops was 40.15% for the plot straw return to soil and 41.63% for that in no return,respectively. The ~(15)N residue rate in 0-50cm soil at the end of sixth crop was 23.62% and 28.33%. When ~(15)N -labeled rice straw was applied as N source, the recovery of ~(15)N in the first season crop of wheat was just 4.46%,and that in second season crop of single late-rice was 4.78%. The accumulated ~(15)N recovery in the continuous five season crops was 11.76%. The ~(15)N residue rate in 0-50cm soil at the end of the fifth crop was (70.37%.) |
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| Keywords: | Nitrogen Rice straw ~(15)N trace Fertilizer recovery |
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