Leaf chlorophyll readings as an indicator for spinach yield and nutritional quality with different nitrogen fertilizer applications
文献类型：期刊论文
| 作者 | Ding, Hui; Smith, E. Andrew; Zhu, Yong-Guan; Tong, Yi-Ping; Liu, Yan-Ju |
| 刊名 | JOURNAL OF PLANT NUTRITION
 |
| 出版日期 | 2006 |
| 卷号 | 29期号:7页码:1207-1217 |
| 关键词 | Spad Readings Chlorophyll Meter Nitrogen Nitrate-n Ascorbic Acid |
| 英文摘要 | The objective of this study was to investigate the possibility of predicting the concentrations of total nitrogen (N), nitrate-nitrogen, and ascorbic acid in spinach (Spinacia oleracea) leaves using the pocket chlorophyll meter SPAD-502 (Minolta, Japan) in a pot experiment in a greenhouse. Spinach plants were grown in plastic pots filled with 0.5 kg of brown soil per pot with urea as N fertilizer at 0, 30, 60, 120, and 240 mg N/kg soil. SPAD readings of the two uppermost fully expanded leaves were recorded 18, 25, and 32 d after sowing and at harvesting (34 d). Dry-matter biomass and total N concentrations in leaves and roots, and NO3-N, and ascorbic acid concentrations in leaves, were measured after harvesting. SPAD readings showed continuous reduction with increasing growth period irrespective of N applications. SPAD readings at harvest were significantly correlated with total N, leaf dry weight (DW), and NO3-N concentration. However, this correlation did not exist between SPAD readings and ascorbic acid concentrations in leaves. The above results suggest that it is possible to apply SPAD readings to estimate NO3-N concentrations in spinach plants, and that they may be applied for field assessments in decision-making and operational nutrient-management programs for the plant. Furthermore, the SPAD method may also be useful for ascertaining the harvest time. The results suggest that treatment with 120 mg N/kg significantly improved both leaf yields and leaf quality (i.e., leaf nitrate-N concentration and ascorbic acid). Too little and too much N fertilizer was not good for yield or spinach quality. |
| WOS记录号 | WOS:000239386800004 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/23062]  |
| 专题 | 生态环境研究中心_土壤环境科学实验室 |
| 推荐引用方式 GB/T 7714 | Ding, Hui,Smith, E. Andrew,Zhu, Yong-Guan,et al. Leaf chlorophyll readings as an indicator for spinach yield and nutritional quality with different nitrogen fertilizer applications[J]. JOURNAL OF PLANT NUTRITION,2006,29(7):1207-1217. |
| APA | Ding, Hui,Smith, E. Andrew,Zhu, Yong-Guan,Tong, Yi-Ping,&Liu, Yan-Ju.(2006).Leaf chlorophyll readings as an indicator for spinach yield and nutritional quality with different nitrogen fertilizer applications.JOURNAL OF PLANT NUTRITION,29(7),1207-1217. |
| MLA | Ding, Hui,et al."Leaf chlorophyll readings as an indicator for spinach yield and nutritional quality with different nitrogen fertilizer applications".JOURNAL OF PLANT NUTRITION 29.7(2006):1207-1217. |
入库方式： OAI收割
来源：生态环境研究中心
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