Influences of nitrogen fertilizer application rates on radish yield, nutrition quality, and nitrogen recovery efficiency

doi:10.1007/s11703-009-0041-y

Front Agric Chin

2009, Vol. 3

Issue (2) : 122-129 https://doi.org/10.1007/s11703-009-0041-y

RESEARCH ARTICLE

Influences of nitrogen fertilizer application rates on radish yield, nutrition quality, and nitrogen recovery efficiency

Yulin LIAO*¹, Xiangmin RONG*¹(

), Qiang LIU*¹, Meirong FAN¹, Jianwei PENG¹, Guixian XIE¹, Yulin LIAO², Shengxian ZHENG*²(

), Meirong FAN*³

1. College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; 2. Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China; 3. Changsha Environmental Protection Colleges, Changsha 410004, China

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Abstract

Radishes (Raphanus sativus L.) were grown in plastic pots in a screenhouse to investigate the influences of nitrogen fertilizer application rates (NFAR) on yield, nitrate content, nitrate reductase activity (NR), nutrition quality, and nitrogen recovery efficiency (NRE) at commercial mature stage. Five N-rate treatments, 0.644, 0.819, 0.995, 1.170, and 1.346 g?pot^-1, were set up in the screenhouse pot experiments, and nitrogen fertilizer (unlabeled N and ¹⁵N-labeled fertilizer) was applied as basal dressing and topdressing, respectively. The results indicated that the fresh and dry weight yields of radish increased with the increase of NFAR at the range of 0.099 to 0.180 g N?kg^-1 soil, decreased at 0.207 g N?kg^-1 soil, and accordingly there was a significant quadratic relationship between the fresh and dry weight yields of radish and the NFAR. At the high addition of urea-N fertilizer, the nitrate content accumulated in the fleshy roots and leaves due to the decline in NR activity. From 0.644 to 0.819 g N?pot^-1 NR increased most rapidly, the highest NR activity occurred at 0.819 g N?pot^-1, and the lowest NR activity happened at 1.346 g N?pot^-1. Soluble sugar and ascorbic acid initially increased to the highest value and then decreased, and, contrarily, crude fiber rapidly decreased with the increase of NFAR. Total N uptake (TNU), N derived from fertilizer (N_dff), and N derived from soil (N_dfs) in radish increased, except that N_dfs relatively and slightly decreased at the rate of 0.207 g N?kg^-1soil. The ratio of N_dff to TNU increased, but the ratio of N_dfs to TNU as well as NRE of N fertilizer decreased with the increase of NFAR. Therefore, the appropriate NFAR should be preferably recommended for improving the yields and nutrition qualities of radish and NRE of N fertilizer.

Keywords ¹⁵N-labeled nitrogen fertilizer radish yields nutrition quality nitrogen recovery efficiency

Corresponding Author(s): RONG* Xiangmin,Email:rongxm2005@126.com; ZHENG* Shengxian,Email:sxzheng@ipni.ac.cn

Issue Date: 05 June 2009

Cite this article:

Guixian XIE,Yulin LIAO,Shengxian ZHENG*, et al. Influences of nitrogen fertilizer application rates on radish yield, nutrition quality, and nitrogen recovery efficiency[J]. Front Agric Chin, 2009, 3(2): 122-129.

URL:

https://academic.hep.com.cn/fag/EN/10.1007/s11703-009-0041-y
https://academic.hep.com.cn/fag/EN/Y2009/V3/I2/122

Fig.1 The correlations of nitrogen fertilizer application rates (a) and total N uptake (b) with fresh weight yield (open triangles) and dry weight yield (open circles) of radish
Note: The lines through the points are least-squares regressions. The regression functions are (a) =2.55+531.26–215.08 (=0.87, <0.01) and =4.07+34.01–13.69 (=0.82, <0.01) for fresh weight and dry weight; (b) =119.24+0.24 (=0.73, <0.01) and =10.66+0.0125 (=0.77, <0.01) for fresh weight and dry weight.

Fig.2 Influences of nitrogen fertilizer application rates on the contents of NO in the fleshy roots (open squares) and the leaves (filled squares) of radish
Note: Data are shown in mean±SD, =5.

Fig.3 Influences of nitrogen fertilizer application rates on NR activity in the leaf blades of radish
Note: Data are shown in mean±SD, =5.

Fig.4 The relationship between the NO contents and the NR activity in the leaf of radish
Note: The lines through the points are least-squares regressions. The regression function is =637.08-37.75 (=0.54, <0.01).

Fig.5 Influences of nitrogen fertilizer application rates on the contents of soluble sugar in the fleshy roots (open squares) and the leaves (filled squares) of radish
Note: Data are shown in mean±SD, =5.

Fig.6 Influences of nitrogen fertilizer application rates on the contents of ascorbic acid in the fleshy roots (open squares) and the leaves (filled squares) of radish
Note: Data are shown in mean±SD, =5.

Fig.7 Influences of nitrogen fertilizer application rates on the contents of crude fiber in the fleshy roots (open squares) and the leaves (filled squares) of radish
Note: Data are shown in mean±SD, =5.

Fig.8 The correlations of crude fiber content with total N content in the fleshy roots (open triangles) and the leaves (open circles) of radish
Note: The lines through the points are least-squares regressions. The regression functions are =348.63-4.73 (=0.65, <0.01) and =196.89-2.22 (=0.21, <0.01) for the fleshy roots and the leaves.

Fig.9 Influences of N fertilizer application rates on total N uptake (TNU, filled squares), N derived from fertilizer (N, open circles), and N derived from soil (N, filled circles) of radish
Note: Data are shown in mean±SD, =5.

Fig.10 Influences of nitrogen fertilizer application rates on the ratios of N derived from fertilizer (N, filled squares) and N derived from soil (N, open squares) to total N uptake (TNU) in radish
Note: Data are shown in mean±SD, =5.

Fig.11 Influences of nitrogen fertilizer application rates on N recovery efficiency of fertilizer N in radish
Note: Data are shown in mean±SD, =5.

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