Effects of Different Ridge Heights on Soil Heat Status,Root Growth, and Leaf Maturity Tolerance of Flue-cured Tobacco

doi:10.7668/hbnxb.20194779

Abstract

Abstract:

To study the effects of ridge height on soil heat status,root growth,and tobacco maturity tolerance in tobacco planting,a 2-year field experiment was conducted using the flue-cured tobacco variety Yueyan 97 as the test material from 2022 to 2023.Three treatments were set up,including a ridge height of 30 cm(CK),a ridge height of 38 cm(T1),and a ridge height of 46 cm(T2),to analyze the changes in soil temperature and heat flux,root appearance and growth indicators,root vitality,and tobacco maturity related indicators under different ridge heights.The results indicated that the daily temperature difference in soil varies with the depth of the soil layer,and the daily temperature difference in the surface layer of the soil was the largest.Increasing ridge height can increase the average temperature of tobacco planting soil by 0.4-1.8 ℃ and increase soil heat flux by 4-56 W/m².In the 2 a experiment,the maximum increase in root length for a ridge height of 38 cm compared to a ridge height of 30 cm was 27.26%,the maximum increase in root dry mass was 26.21%,and the maximum increase in root vitality was 14.97%,with significant differences.Compared with a ridge height of 30 cm,the soluble protein content,peroxidase activity,and cell membrane stability index of a ridge height of 38 cm increased by 17.99%,27.82%,and 9.05 percentage points(2022),respectively and by 10.23%,12.44%,and 8.16 percentage points(2023),respectively.The maximum decrease in malondialdehyde content was 24.84% and 44.43%,respectively.Correlation analysis showed that root activity was significantly negatively correlated with malondialdehyde content,peroxidase activity was extremely significantly positively correlated with root growth indexes, and soluble protein content was significantly positively correlated with root length.In summary,increasing ridge height is beneficial for improving the thermal status of tobacco planting soil,promoting root growth,enhancing root vitality,enhancing leaf antioxidant capacity,and enhancing tobacco maturity tolerance.A ridge height of 38 cm is an appropriate ridge height for promoting root growth and improving tobacco maturity tolerance in southern tobacco regions.

Key words: Flue-cured tobacco, Ridge height, Tobacco-planting soil, Root growth, Leaf maturity tolerance

YANG Yanlei, RAN Jing, GUO Hongyan, HE Guangsheng, HUANG Yuepeng, LI Huaiyuan, LI Wencai, CHEN Jianjun, XIE Junxi, DENG Shiyuan. Effects of Different Ridge Heights on Soil Heat Status,Root Growth, and Leaf Maturity Tolerance of Flue-cured Tobacco[J]. Acta Agriculturae Boreali-Sinica, 2024, 39(5): 128-138. doi: 10.7668/hbnxb.20194779.

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References 48

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年份 Year	pH	有机质 Organic matter	全氮 Total N	全磷 Total P	全钾 Total K	碱解氮 Available N	速效磷 Available P	速效钾 Available K
2022	6.03	11.05	1.22	0.77	10.67	0.07	0.05	0.12
2023	6.07	13.48	1.03	0.48	7.65	0.06	0.04	0.12

年份 Year	pH	有机质 Organic matter	全氮 Total N	全磷 Total P	全钾 Total K	碱解氮 Available N	速效磷 Available P	速效钾 Available K
2022	6.03	11.05	1.22	0.77	10.67	0.07	0.05	0.12
2023	6.07	13.48	1.03	0.48	7.65	0.06	0.04	0.12

测定时间 Time of determination	土层深度/cm Soil depth	处理 Treatment	最高温度/℃ Maximum temperature	最低温度/℃ Minimum temperature	平均温度/℃ Mean temperature	日较差/℃ Daily range of temperature
移栽后30 d	0~10	CK	25.6	23.6	24.60	2.0
30 days after transplanting		T1	26.2	25.2	25.70	1.0
		T2	26.5	25.9	26.20	0.6
	10~20	CK	24.3	24.2	24.25	0.1
		T1	24.7	24.5	24.60	0.2
		T2	25.5	25.3	25.40	0.2
	20~30	CK	22.9	22.7	22.80	0.2
		T1	23.6	23.3	23.45	0.3
		T2	24.5	24.3	24.40	0.2
移栽后55 d	0~10	CK	27.5	25.0	26.25	2.5
55 days after transplanting		T1	28.0	26.7	27.35	1.3
		T2	28.6	27.3	27.95	1.3
	10~20	CK	26.5	25.8	26.15	0.7
		T1	26.6	26.0	26.30	0.6
		T2	27.0	26.8	26.90	0.2
	20~30	CK	25.1	24.6	24.85	0.5
		T1	25.2	24.9	25.05	0.3
		T2	26.0	25.6	25.80	0.4
移栽后80 d	0~10	CK	24.2	21.6	22.90	2.6
80 days after transplanting		T1	24.7	23.1	23.90	1.6
		T2	25.1	24.3	24.70	0.8
	10~20	CK	24.3	23.3	23.80	1.0
		T1	23.9	23.6	23.75	0.3
		T2	24.6	24.2	24.40	0.4
	20~30	CK	22.5	22.3	22.40	0.2
		T1	23.7	22.7	23.20	1.0
		T2	24.1	23.7	23.90	0.4
移栽后105 d	0~10	CK	30.5	29.2	29.85	1.3
105 days after transplanting		T1	30.7	29.0	29.85	1.7
		T2	30.8	28.9	29.85	1.9
	10~20	CK	30.3	29.8	30.05	0.5
		T1	30.5	29.7	30.10	0.8
		T2	30.6	29.8	30.20	0.8
	20~30	CK	27.8	27.5	27.65	0.3
		T1	28.2	27.8	28.00	0.4
		T2	28.6	28.1	28.35	0.5

测定时间 Time of determination	土层深度/cm Soil depth	处理 Treatment	最高温度/℃ Maximum temperature	最低温度/℃ Minimum temperature	平均温度/℃ Mean temperature	日较差/℃ Daily range of temperature
移栽后30 d	0~10	CK	25.6	23.6	24.60	2.0
30 days after transplanting		T1	26.2	25.2	25.70	1.0
		T2	26.5	25.9	26.20	0.6
	10~20	CK	24.3	24.2	24.25	0.1
		T1	24.7	24.5	24.60	0.2
		T2	25.5	25.3	25.40	0.2
	20~30	CK	22.9	22.7	22.80	0.2
		T1	23.6	23.3	23.45	0.3
		T2	24.5	24.3	24.40	0.2
移栽后55 d	0~10	CK	27.5	25.0	26.25	2.5
55 days after transplanting		T1	28.0	26.7	27.35	1.3
		T2	28.6	27.3	27.95	1.3
	10~20	CK	26.5	25.8	26.15	0.7
		T1	26.6	26.0	26.30	0.6
		T2	27.0	26.8	26.90	0.2
	20~30	CK	25.1	24.6	24.85	0.5
		T1	25.2	24.9	25.05	0.3
		T2	26.0	25.6	25.80	0.4
移栽后80 d	0~10	CK	24.2	21.6	22.90	2.6
80 days after transplanting		T1	24.7	23.1	23.90	1.6
		T2	25.1	24.3	24.70	0.8
	10~20	CK	24.3	23.3	23.80	1.0
		T1	23.9	23.6	23.75	0.3
		T2	24.6	24.2	24.40	0.4
	20~30	CK	22.5	22.3	22.40	0.2
		T1	23.7	22.7	23.20	1.0
		T2	24.1	23.7	23.90	0.4
移栽后105 d	0~10	CK	30.5	29.2	29.85	1.3
105 days after transplanting		T1	30.7	29.0	29.85	1.7
		T2	30.8	28.9	29.85	1.9
	10~20	CK	30.3	29.8	30.05	0.5
		T1	30.5	29.7	30.10	0.8
		T2	30.6	29.8	30.20	0.8
	20~30	CK	27.8	27.5	27.65	0.3
		T1	28.2	27.8	28.00	0.4
		T2	28.6	28.1	28.35	0.5

指标 Index	根系活力 Root activity	根系长度 Root length	根干质量 Root dry weight	根平均直径 Root average diameter
丙二醛含量Malondialdehyde content	-0.67^*	-0.84^**	-0.88^**	-0.65
过氧化物酶活性Peroxidase activity	0.82^**	0.97^**	0.76^*	0.74^*
可溶性蛋白质含量Soluble protein content	0.57	0.67^*	0.51	0.32
细胞膜稳定指数Cell membrane stability index	-0.02	0.35	0.50	0.28

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