| 田间低钾胁迫条件下水稻对钾的吸收和利用效率 |
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| 引用本文： | 胡泓,王光火,张奇春.田间低钾胁迫条件下水稻对钾的吸收和利用效率[J].中国水稻科学,2004,18(6):527-532. |
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| 作者姓名： | 胡泓 王光火 张奇春 |
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| 作者单位： | 浙江大学 环境与资源学院， 浙江 杭州 310029 |
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| 基金项目： | 国际肥料协会 (IFA)资助项目，磷钾研究所 (PPI)资助项目，国际钾研究所 (IPI)资助项目 |
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| 摘 要： | 通过田间试验，研究了在不同程度低钾胁迫条件下，杂交稻和常规稻在不同生育阶段对钾的吸收、分配和利用效率。在连续8季施氮、磷肥而不施钾肥的严重低钾胁迫条件下，施用钾肥使稻谷产量、水稻钾吸收总量显著增加而钾利用效率显著降低，同时表现出明显的耕作历史同施用钾肥间的交互作用。从幼穗分化期到抽穗期，水稻钾的积累量约占总积累量的一半以上，为水稻积累钾的关键时期。水稻对钾肥反应存在明显的品种间差异，在供钾充足条件下，杂交稻协优46的钾吸收量显著大于常规稻秀水11，但其钾利用效率却显著低于秀水11，表现出对钾的奢侈性吸收；在缺K条件下，杂交稻的钾吸收量低于常规稻，其钾利用效率与常规稻无明显差异。运用混合型离子交换树脂球测试法，可以了解淹水条件下土壤中生物有效性钾的动态变化特征，原地埋置7 d的树脂球的钾吸附量同水稻地上部分钾吸收量呈显著正相关。
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| 关 键 词： | 水稻 钾 养分利用效率 吸收 |
| 文章编号： | 1001-7216(2004)06-0527-06 |
| 收稿时间： | 1900-01-01; |
Potassium Uptake and Use Efficiency of Rice Under Low-Potassium Stress Field Conditions |
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| HU Hong,WANG Guang-huo,ZHANG Qi-chun.Potassium Uptake and Use Efficiency of Rice Under Low-Potassium Stress Field Conditions[J].Chinese Journal of Rice Science,2004,18(6):527-532. |
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| Authors: | HU Hong WANG Guang-huo ZHANG Qi-chun |
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| Institution: | College of Environmental and Resource Science; Zhejiang University; Hangzhou 310029; China |
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| Abstract: | Field fertilizer experiments were conducted to st ud y K uptake, distribution and use efficiency of hybrid and conventional rice un der different low-K stress conditions. Results indicated that grain yield and t otal K uptake by rice increased, while K use efficiency of rice decreased signi ficantly, and interaction effect between cropping history and K application was also significant. The phase from panicle initiation to flowering was critical for K uptake by rice and more than half of the total plant K was accumulated du ring this phase. Total K uptake by hybrid rice Xieyou 46 was significantly highe r compared with conventional rice Xiushui 11 from high-K soil. However, the K use efficiency of Xieyou 46 was significantly lower compared with Xiushui 11 , indicating that hybrid rice possessed potassium luxury consumption character . Under K deficiency situation, K uptake by hybrid rice was less than that by co nventional rice, there was no significant difference between the two rice variet ies in K use efficiency. Resin capsule method was used to measure the dynamic s of soil bio-available K during rice growth period. It was found that the accu mulated K of rice was positively correlated with the adsorbed K of resin capsule s embedded in situ soil for 7 days. |
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| Keywords: | rice potassium nutrient use efficiency uptake |
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