Effects of Exogenous Zinc on the Growth and Quality of Hydroponic Lettuce Under Different Photoperiods

doi:10.11924/j.issn.1000-6850.casb2021-0568

Abstract

Abstract:

Italian bolting-resistant lettuce was used as the test material to study the regulatory effects of exogenous zinc on the growth and quality characteristics of hydroponic lettuce under different photoperiods. The hydroponic method was used, and different photoperiods (12 h/12 h, 16 h/8 h, 20 h/4 h) and exogenous zinc concentrations (0, 0.5 and 1 mg/L ZnSO₄·7H₂O) were set. The test results show that the 16 h/8 h photoperiod treatment is beneficial to the growth of lettuce shoots and the content increase of vitamin C, flavonoids and total phenols, while the 20 h/4 h photoperiod treatment is beneficial to the growth of lettuce underground parts and the content increase of soluble protein, soluble sugar and reducing sugar. But the 20 h/4 h photoperiod treatment can inhibit the growth of lettuce, thereby affecting the accumulation of dry matter. From the interaction effect of photoperiod and zinc, photoperiod plays a leading role in the growth and quality of lettuce, and exogenous zinc plays a regulatory role. In summary, root application of 0.5 mg/L Zn under 16 h/8 h photoperiod has the best effect on promoting the growth and quality of lettuce.

Key words: Italian bolting-resistant lettuce, photoperiod, micronutrients, exogenous zinc, hydroponics, regulatory effect

CLC Number:

S636.2

ZHANG Yuanbo, HAO Wenqin, SHI Yu, HAN Ruifeng, CHENG Yongsan, ZHANG Yi. Effects of Exogenous Zinc on the Growth and Quality of Hydroponic Lettuce Under Different Photoperiods[J]. Chinese Agricultural Science Bulletin, 2022, 38(13): 41-46.

Figures/Tables 7

References 34

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处理	株高/cm	叶长/cm	叶宽/cm	叶片数	地上部鲜重/g	地下部鲜重/g	地上部干重/g	地下部干重/g
12-0	14.00±0.28cd	14.76±0.60cde	8.30±0.65de	15.00±0.33cd	19.79±3.25c	1.77±0.36cde	1.07±0.14de	0.11±0.030e
12-0.5	14.26±0.14bcd	15.43±0.40cd	7.43±0.52ef	16.00±0.88c	17.79±1.98c	1.10±0.17e	0.99±0.12e	0.12±0.014de
12-1	13.33±0.32de	13.76±0.48de	6.00±0.43f	17.00±0.33c	14.39±2.48c	1.32±0.19de	0.93±0.15e	0.13±0.020de
16-0	17.10±0.30a	19.93±0.81a	10.83±0.43ab	18.00±0.66ab	47.37±2.09a	1.96±0.11bcde	2.73±0.31a	0.30±0.058b
16-0.5	16.10±0.20ab	17.76±0.32b	11.13±0.54ab	19.00±0.33a	48.98±2.59a	3.01±0.15b	2.74±0.31a	0.22±0.033bc
16-1	15.53±0.26abc	16.70±0.81bc	10.36±0.40abc	17.00±0.57bc	32.95±2.74b	2.24±0.38bcd	1.64±0.12cd	0.20±0.016cd
20-0	11.83±1.36ef	13.76±1.39de	9.56±1.10bcd	14.00±0.33ef	30.46±3.33b	2.72±0.47bc	2.13±0.15bc	0.26±0.013bc
20-0.5	13.26±1.02de	14.56±0.34cde	11.53±0.26a	14.00±0.57de	41.20±1.49a	5.94±0.61a	2.58±0.07ab	0.47±0.010a
20-1	11.16±0.66f	12.66±0.41e	8.66±0.41cde	12.00±0.33f	18.41±3.12c	2.51±0.11bc	1.50±0.14de	0.30±0.020b

处理	株高/cm	叶长/cm	叶宽/cm	叶片数	地上部鲜重/g	地下部鲜重/g	地上部干重/g	地下部干重/g
12-0	14.00±0.28cd	14.76±0.60cde	8.30±0.65de	15.00±0.33cd	19.79±3.25c	1.77±0.36cde	1.07±0.14de	0.11±0.030e
12-0.5	14.26±0.14bcd	15.43±0.40cd	7.43±0.52ef	16.00±0.88c	17.79±1.98c	1.10±0.17e	0.99±0.12e	0.12±0.014de
12-1	13.33±0.32de	13.76±0.48de	6.00±0.43f	17.00±0.33c	14.39±2.48c	1.32±0.19de	0.93±0.15e	0.13±0.020de
16-0	17.10±0.30a	19.93±0.81a	10.83±0.43ab	18.00±0.66ab	47.37±2.09a	1.96±0.11bcde	2.73±0.31a	0.30±0.058b
16-0.5	16.10±0.20ab	17.76±0.32b	11.13±0.54ab	19.00±0.33a	48.98±2.59a	3.01±0.15b	2.74±0.31a	0.22±0.033bc
16-1	15.53±0.26abc	16.70±0.81bc	10.36±0.40abc	17.00±0.57bc	32.95±2.74b	2.24±0.38bcd	1.64±0.12cd	0.20±0.016cd
20-0	11.83±1.36ef	13.76±1.39de	9.56±1.10bcd	14.00±0.33ef	30.46±3.33b	2.72±0.47bc	2.13±0.15bc	0.26±0.013bc
20-0.5	13.26±1.02de	14.56±0.34cde	11.53±0.26a	14.00±0.57de	41.20±1.49a	5.94±0.61a	2.58±0.07ab	0.47±0.010a
20-1	11.16±0.66f	12.66±0.41e	8.66±0.41cde	12.00±0.33f	18.41±3.12c	2.51±0.11bc	1.50±0.14de	0.30±0.020b