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| 不同施氮量对大棚莴苣根系形态及产量和品质的影响 | |
| 引用本文： | 陆扣萍,谢寅峰,闵 炬,施卫明.不同施氮量对大棚莴苣根系形态及产量和品质的影响[J].土壤,2011,43(4):542-547. |
| 作者姓名： | 陆扣萍 谢寅峰 闵 炬 施卫明 |
| 作者单位： | 1. 南京林业大学森林资源与环境学院,南京210037;中国科学院南京土壤研究所面源污染治理技术研发中心,南京210008 2. 南京林业大学森林资源与环境学院,南京,210037 3. 中国科学院南京土壤研究所面源污染治理技术研发中心,南京,210008 |
| 基金项目： | 国家科技重大专项项目（2008ZX07101-005） 资助 |
| 摘 要： | 采用大棚栽培田间小区试验，研究了不同施氮量下莴苣根系形态特征的动态变化，以及不同施氮水平对莴苣产量和品质的影响。结果表明：与农民习惯施氮相比，减氮40% 处理对莴苣根系生长有显著促进作用，主要表现为根表面积和体积以及总根长显著增加；但氮肥对莴苣根增粗生长的促进作用主要表现在生长后期。减氮40% 处理下的莴苣产量和Vc含量最高。莴苣茎硝酸盐含量随施氮量的增加呈线性增加，农民习惯施氮处理下，莴苣茎硝酸盐含量最高，达到1 291.9 mg/kg，已超过农产品安全质量无公害根茎类蔬菜的安全标准。 |
| 关 键 词： | 太湖地区 大棚蔬菜 氮肥 根系 产量 品质 |
Effects of different N rates on root morphology, yield and fruit quality of lettuce cultivated in plastic greenhouse |
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| LU Kou-ping,XIE Yin-feng,MIN Ju,SHI Wei-ming.Effects of different N rates on root morphology, yield and fruit quality of lettuce cultivated in plastic greenhouse[J].Soils,2011,43(4):542-547. | |
| Authors: | LU Kou-ping XIE Yin-feng MIN Ju SHI Wei-ming |
| Institution: | College of Forest Resources and Environment, Nanjing Forestry University |
| Abstract: | Field experiments were carried out to study the effects of different N rates on dynamic changes of root morphological characteristics and the yield and quality of lettuce cultivated in plastic greenhouse. The results showed that as compared with farmer habitual N usage, 40% reduction of N fertilizer input enhanced significantly lettuce root growth, mainly in increasing the root surface area, volume and total root length greatly; but the promotion of nitrogen fertilizer on root diameter was only observed in the late stages of growth. The highest yield and vitamin C contents were obtained in the treatment of 40% reduction of N fertilizer input. Furthermore, nitrate contents of lettuce increased with increase of N fertilizer input. With farmer habitual N usage, nitrate content of lettuce reached as high as to 1 291.9 mg/kg and exceeded the safety standard of safety and quality of agricultural products for root vegetables. |
| Keywords: | Taihu Lake region Greenhouse vegetable Nitrogenous fertilizer Root system Yield Quality |
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