在前期研究确定总氮用量180 kg hm–2下,缓释氮肥与常规氮肥7∶3配施比例可获得机插稻高产的基础上,研究缓释氮肥配施和不同株距下机插杂交稻磷素积累、分配与利用特征及其与产量的关系。采用二因素裂区设计,设3种机插株距(行距均为30 c...在前期研究确定总氮用量180 kg hm–2下,缓释氮肥与常规氮肥7∶3配施比例可获得机插稻高产的基础上,研究缓释氮肥配施和不同株距下机插杂交稻磷素积累、分配与利用特征及其与产量的关系。采用二因素裂区设计,设3种机插株距(行距均为30 cm)16、18及20 cm和4个缓释氮肥用量(36、66、96和126 kg hm–2)与常规氮肥(均为54kg hm–2)配施处理。结果表明,缓释氮肥用量对机插稻主要生育时期磷素积累量、各生育阶段磷素吸收量及吸收速率、结实期茎鞘磷素转运量及转运率和叶片磷素转运率及贡献率均有显著影响。在株距为18 cm,群体密度为18.52万穴hm–2,缓释氮肥(96 kg hm–2)与常规氮肥(54 kg hm–2)配施总量为150 kg hm–2时,可有效提高机插稻对磷素的吸收,促进结实期茎鞘、叶片磷素向穗部的转运及分配,能充分发挥本区域机插杂交籼稻的优势,产量可达11 463.8 kg hm–2,为本试验的最佳肥密运筹处理。株距为16 cm,群体密度(20.84万穴hm–2)相对较大,施氮总量为180 kg hm–2时,群体吸收的磷总量较高,进一步促进了植株体内磷素的吸收转运及分配,有利于产量提高,但从节本增效的角度考虑,以缓释氮肥配施量150 kg hm–2为宜;株距增加到20 cm施氮总量在180 kg hm–2下,群体(16.67万穴hm–2)较小,吸收磷素的绝对量少,茎鞘、叶片中的磷素向穗部转运量多,穗部磷素积累量增加,产量增加。相关分析表明,株距与缓释氮肥配施量耦合下,尤其以齐穗期至成熟期茎鞘磷素转运量与产量相关性较高(r=0.72**),更有利于产量的提高。展开更多
[Objective] To compare the translocation and distribution of imidacloprid in tobacco with spray and root irrigation application methods. [Methods] Pot experiment in the greenhouse was carried out, and LC-MSMS was used...[Objective] To compare the translocation and distribution of imidacloprid in tobacco with spray and root irrigation application methods. [Methods] Pot experiment in the greenhouse was carried out, and LC-MSMS was used to determine the con- tent of imidacloprid in different parts of tobacco plants （roots, stems, the upper, middle and lower leaves） at different time. [Results] The imidacloprid could be absorbed by root and could be transported to all parts of the tobacco plant after irrigating root, but the original deposition amount was larger and the transport efficiency was lower after spraying. [Conclusion] The translocation and distribution of imidacloprid by spraying was more uniform and the holding efficiency was better, but imidacloprid with root irrigation could act on leaf directly, and had better readily availability.展开更多
文摘在前期研究确定总氮用量180 kg hm–2下,缓释氮肥与常规氮肥7∶3配施比例可获得机插稻高产的基础上,研究缓释氮肥配施和不同株距下机插杂交稻磷素积累、分配与利用特征及其与产量的关系。采用二因素裂区设计,设3种机插株距(行距均为30 cm)16、18及20 cm和4个缓释氮肥用量(36、66、96和126 kg hm–2)与常规氮肥(均为54kg hm–2)配施处理。结果表明,缓释氮肥用量对机插稻主要生育时期磷素积累量、各生育阶段磷素吸收量及吸收速率、结实期茎鞘磷素转运量及转运率和叶片磷素转运率及贡献率均有显著影响。在株距为18 cm,群体密度为18.52万穴hm–2,缓释氮肥(96 kg hm–2)与常规氮肥(54 kg hm–2)配施总量为150 kg hm–2时,可有效提高机插稻对磷素的吸收,促进结实期茎鞘、叶片磷素向穗部的转运及分配,能充分发挥本区域机插杂交籼稻的优势,产量可达11 463.8 kg hm–2,为本试验的最佳肥密运筹处理。株距为16 cm,群体密度(20.84万穴hm–2)相对较大,施氮总量为180 kg hm–2时,群体吸收的磷总量较高,进一步促进了植株体内磷素的吸收转运及分配,有利于产量提高,但从节本增效的角度考虑,以缓释氮肥配施量150 kg hm–2为宜;株距增加到20 cm施氮总量在180 kg hm–2下,群体(16.67万穴hm–2)较小,吸收磷素的绝对量少,茎鞘、叶片中的磷素向穗部转运量多,穗部磷素积累量增加,产量增加。相关分析表明,株距与缓释氮肥配施量耦合下,尤其以齐穗期至成熟期茎鞘磷素转运量与产量相关性较高(r=0.72**),更有利于产量的提高。
基金Supported by the Key Science and Technology Project of Jinlin Tobacco Industrial Co.,Ltd.(JS-2015-07)the Scientific and Technological Innovation Project of Chinese Academy of Agricultural Sciences(ASTIP-TRIC06)~~
文摘[Objective] To compare the translocation and distribution of imidacloprid in tobacco with spray and root irrigation application methods. [Methods] Pot experiment in the greenhouse was carried out, and LC-MSMS was used to determine the con- tent of imidacloprid in different parts of tobacco plants （roots, stems, the upper, middle and lower leaves） at different time. [Results] The imidacloprid could be absorbed by root and could be transported to all parts of the tobacco plant after irrigating root, but the original deposition amount was larger and the transport efficiency was lower after spraying. [Conclusion] The translocation and distribution of imidacloprid by spraying was more uniform and the holding efficiency was better, but imidacloprid with root irrigation could act on leaf directly, and had better readily availability.
