Effects of Density and Leaves Left on Growth, Yield and Quality of Flue-cured Tobacco ‘NC297’

doi:10.11923/j.issn.2095-4050.cjas2023-0036

Abstract

Abstract:

In order to study the supporting cultivation measures of the new flue-cured tobacco variety ‘NC297’ in Chuxiong tobacco-growing area, and determine the suitable planting density and number of leaves left, the orthogonal test with three levels of planting density and number of leaves left of flue-cured tobacco ‘NC297’ was designed. The results showed that the density of 13800 plants/hm² and 18 leaves per plant had the largest plant height, leaf length and leaf width. The disease index of black shank, bacterial wilt, climate spot and common mosaic disease were significantly lower in the medium to low density treatment group than in the high-density control group. Net photosynthetic rate, CO₂ concentration, stomatal conductance and transpiration rate of low density treatment all were at a high level. The planting density of 15100 plants/hm² and 20 leaves per plant showed the best appearance quality, followed by the treatment with the density of 13800 plants/hm² and 18 leaves per plant. The density of 13800 plants/hm² and 18 leaves per plant treatment had significantly higher average prices and the highest proportion of medium to high quality tobacco, and high yield. The output value was only second to the treatment with planting density of 16600 plants/hm² and 18 leaves per plant. The treatment with a density of 13800 plants/hm² and 18 leaves had the most coordinated chemical composition and the highest total score. According to the results of this experiment, the suitable planting density of flue-cured tobacco ‘NC297’ in Chuxiong tobacco area is 13800 plants/hm², and the suitable number of leaves left for topping is 18 per plant.

Key words: planting density, remained leaves number, ‘NC297’, yield, quality

WU Hao, WEN Yi, LIN Yunhong, XIONG Qian, XU Wei, YANG Maosong, ZHOU Youhai, WANG Ge, DU Yu, BAI Yuxiang, WANG NA, ZHOU Peng. Effects of Density and Leaves Left on Growth, Yield and Quality of Flue-cured Tobacco ‘NC297’[J]. Journal of Agriculture, 2024, 14(1): 15-21.

Figures/Tables 8

References 34

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处理编号	种植密度/（株/hm²）	行距/m	株距/m	留叶数/片
A₁B₁	13800	1.2	0.60	18
A₁B₂				20
A₁B₃				22
A₂B₁	15100	1.2	0.55	18
A₂B₂				20
A₂B₃				22
A₃B₁	16600	1.2	0.50	18
CK				20
A₃B₃				22

处理编号	种植密度/（株/hm²）	行距/m	株距/m	留叶数/片
A₁B₁	13800	1.2	0.60	18
A₁B₂				20
A₁B₃				22
A₂B₁	15100	1.2	0.55	18
A₂B₂				20
A₂B₃				22
A₃B₁	16600	1.2	0.50	18
CK				20
A₃B₃				22

移栽后天数/d	处理编号	株高/cm	最大叶长/cm	最大叶宽/cm	茎围/cm
30	A₁	22.39a	42.83a	14.27a	6.58a
	A₂	21.87a	40.55a	14.35a	6.03b
	CK	19.38b	43.44a	14.30a	6.15b
60	A₁	88.22a	61.44a	25.89a	9.04a
	A₂	88.07a	59.59a	23.96b	8.76a
	CK	86.44a	58.50a	23.33b	8.57b

移栽后天数/d	处理编号	株高/cm	最大叶长/cm	最大叶宽/cm	茎围/cm
30	A₁	22.39a	42.83a	14.27a	6.58a
	A₂	21.87a	40.55a	14.35a	6.03b
	CK	19.38b	43.44a	14.30a	6.15b
60	A₁	88.22a	61.44a	25.89a	9.04a
	A₂	88.07a	59.59a	23.96b	8.76a
	CK	86.44a	58.50a	23.33b	8.57b

处理编号	株高	最大叶长	最大叶宽	茎围
A₁B₁	128.12a	81.00a	39.20a	10.73a
A₁B₂	127.41ab	79.50ab	38.50ab	9.05a
A₁B₃	125.76bc	79.21ab	38.37ab	9.00a
A₂B₁	125.67bc	79.67ab	36.88bc	10.40a
A₂B₂	122.50d	78.83ab	36.05cd	10.52a
A₂B₃	122.33d	78.73ab	35.70cd	10.47a
A₃B₁	122.73d	77.56b	35.00cd	9.53a
CK	124.84c	77.10b	34.19d	9.65a
A₃B₃	122.35d	77.27b	33.60d	9.71a