Effects of Continuous Light Before Harvest on Nutrient Element Contents of Hydroponic Lettuce Cultivated Supplied With Three Nitrogen Levels and Two LED Red and Blue Light Qualities

Wen-ke LIU; Yu-bin ZHANG; Ling-yan ZHA; Yi-fei LIU

doi:10.3964/j.issn.1000-0593(2020)12-3884-06

Journals >Spectroscopy and Spectral Analysis >Volume 40 >Issue 12 >Page 3884 > Article

Spectroscopy and Spectral Analysis
Vol. 40, Issue 12, 3884 (2020)

Effects of Continuous Light Before Harvest on Nutrient Element Contents of Hydroponic Lettuce Cultivated Supplied With Three Nitrogen Levels and Two LED Red and Blue Light Qualities

Wen-ke LIU^1、1, Yu-bin ZHANG^1、1、*, Ling-yan ZHA^1、1, and Yi-fei LIU^1、1

Author Affiliations

¹[in Chinese]

¹1. College of Plant Science, Tarim University, Alar 843300, China

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DOI: 10.3964/j.issn.1000-0593(2020)12-3884-06 Cite this Article

Wen-ke LIU, Yu-bin ZHANG, Ling-yan ZHA, Yi-fei LIU. Effects of Continuous Light Before Harvest on Nutrient Element Contents of Hydroponic Lettuce Cultivated Supplied With Three Nitrogen Levels and Two LED Red and Blue Light Qualities[J]. Spectroscopy and Spectral Analysis, 2020, 40(12): 3884 Copy Citation Text

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Fig. 1. CL treatment and harvest times as well as light conditions during experiment after transplanting of lettuce

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取样时间	处理	上部干重/g
	N8	0.64±0.01c
BCL	N10	0.70±0.00bc
	N12	0.73±0.01b
	N8	1.19±0.03a
ACL(2R:1B)	N10	1.20±0.05a
	N12	1.17±0.02a
	N8	1.26±0.01a
ACL(4R: 1B)	N10	1.32±0.04a
	N12	1.31±0.02a

Table 1. Effects of CL qualities on the shoot dry weight of hydroponic lettuce under three nitrogen levels

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氮水平	大中量元素含量/(g·100 g^-1)						微量元素含量/(mg·kg^-1)
氮水平	N	C	K	P	Ca	Mg	Fe	Mn	Cu	Zn
N8	5.5±0.0a	38.6±0.4a	6.4±0.2a	0.6±0.0a	0.4±0.0b	0.11±0.00b	159±24a	252±14a	15.3±2.2a	40.2±3.0a
N10	5.7±0.1a	38.5±0.4a	6.3±0.3ab	0.6±0.0a	0.5±0.1b	0.14±0.02ab	102±18ab	121±24b	7.5±1.3b	22.2±5.3b
N12	5.5±0.2a	38.6±0.5a	5.6±0.2b	0.5±0.0a	0.7±0.0a	0.17±0.02a	77±13b	136±14b	9.1±1.2b	26.6±5.3ab

Table 2. Effects of nitrogen level on nutrient content of hydroponic lettuce

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氮水平	大中量元素积累/mg						微量元素积累/μg
氮水平	N	C	K	P	Ca	Mg	Fe	Mn	Cu	Zn
N8	36.6±1.4b	254±8a	41.9±0.6a	4.3±0.4a	2.8±0.2b	0.7±0.0b	105±18a	166±13a	10.0±1.4a	26.4±1.9a
N10	38.9±1.2ab	260±10a	42.4±2.5a	3.9±0.2a	3.3±0.4b	0.9±0.1b	68±10a	81±17b	5.1±0.9b	15.0±3.7b
N12	42.9±1.8ab	303±24a	43.8±2.6a	4.2±0.1a	5.3±0.3a	1.3±0.1a	62±13a	107±14b	7.1±0.9ab	20.9±4.2ab

Table 3. Effects of nitrogen level on nutrient accumulation of hydroponic lettuce

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处理	大中量元素含量/(g·100 g^-1)						微量元素含量/(mg·kg^-1)
处理	N	C	K	P	Ca	Mg	Fe	Mn	Cu	Zn
N8Q2	5.1±0.3ab	41.8±0.2a	5.3±0.3ab	0.43±0.02ab	0.50±0.05c	0.12±0.01d	41.3±3.5b	81±4b	3.9±0.2c	11.2±1.3b
N8Q4	4.9±0.1b	42.3±0.4a	4.7±0.2b	0.38±0.02b	0.63±0.02b	0.16±0.01bc	55.7±2.2ab	99±6ab	6.3±0.6ab	15.9±1.2ab
N10Q2	5.6±0.2a	41.2±0.5a	5.5±0.2a	0.46±0.01a	0.63±0.02b	0.16±0.00c	59.1±7.6ab	128±18a	5.9±0.8abc	16.2±2.6ab
N10Q4	5.5±0.1ab	42.2±0.1a	4.6±0.1b	0.43±0.02ab	0.68±0.01ab	0.16±0.00c	65.1±5.1a	108±9ab	6.9±0.8a	19.1±1.8a
N12Q2	5.7±0.2a	41.6±1.0a	5.2±0.3ab	0.46±0.02a	0.74±0.06a	0.18±0.01a	58.9±8.8ab	112±20ab	4.4±0.1bc	15.4±3.2ab
N12Q4	5.5±0.1ab	41.2±0.2a	5.5±0.1a	0.48±0.01a	0.78±0.01a	0.18±0.00ab	58.8±1.7ab	104±6ab	6.6±0.7a	18.5±0.7a

Table 4. Effects of pre-harvest CL light quality on nutrient contents of hydroponic lettuce under different nitrogen levels

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处理	大中量元素积累/mg						微量元素积累/μg
处理	N	C	K	P	Ca	Mg	Fe	Mn	Cu	Zn
N8Q2	60.9±5.6ab	519±37a	64.7±1.1ab	5.4±0.5ab	6.3±0.7c	1.5±0.2b	51.2±4.3b	101±9b	4.9±0.3c	13.9±1.5b
N8Q4	60.0±7.8b	514±14a	57.6±3.0bc	4.7±0.3b	7.8±0.3b	2.0±0.1a	68.6±3.5ab	122±9ab	7.8±0.9ab	19.7±1.8ab
N10Q2	69.7±2.7ab	532±34a	70.1±2.6a	5.8±0.4a	8.0±0.3b	1.9±0.1a	75.5±10.5a	164±26a	7.6±1.2abc	20.8±3.7ab
N10Q4	67.6±3.1ab	508±21a	56.0±2.7b	5.2±0.3ab	8.3±0.3b	1.9±0.1a	79.8±7.6a	133±14ab	8.5±1.1a	23.5±2.8a
N12Q2	66.5±1.1ab	486±20a	60.9±3.6bc	5.4±0.2ab	8.7±0.6ab	2.1±0.0a	69.1±9.3ab	131±22ab	5.3±0.0bc	18.0±3.4ab
N12Q4	71.1±3.3a	537±10a	70.9±1.3a	6.2±0.1a	10.1±0.2a	2.3±0.1a	76.4±1.9a	135±10ab	8.6±0.9a	24.0±0.7a

Table 5. Effects of pre-harvest CL light quality on nutrient accumulations of hydroponic lettuce under different nitrogen levels

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取样时间	大中量元素含量/(g·100 g^-1)						微量元素含量/(mg·kg^-1)
取样时间	N	C	K	P	Ca	Mg	Fe	Mn	Cu	Zn
BCL	5.6±0.1a	38.6±0.0b	6.1±0.2a	0.6±0.0a	0.5±0.1a	0.14±0.0a	100±12a	170±42a	10.6±2.4a	29.7±5.4a
ACL	5.4±0.2a	41.7±0.2a	5.1±0.1b	0.4±0.0b	0.7±0.1a	0.16±0.0a	55±4b	105±8a	5.7±0.4a	16.1±1.3a

Table 6. Comparison of nutrient contents in hydroponic lettuce before and after pre-harvest CL

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取样时间	大中量元素积累/mg						微量元素积累/μg
取样时间	N	C	K	P	Ca	Mg	Fe	Mn	Cu	Zn
BCL	39.5±1.9b	272±15b	41.9±0.2b	4.1±0.1b	3.8±0.8b	1.0±0.2b	68.7±4.4a	118±19a	7.1±1.2a	20.8±3.3a
ACL	65.9±2.8a	516±3a	63.4±1.4a	5.5±0.2a	8.2±0.7a	1.9±0.1a	71.4±2.5a	131±11a	6.6±0.2a	19.9±1.6a

Table 7. Comparison of nutrient accumulations of hydroponic lettuce before and after pre-harvest CL

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