Effects of N, P, K Dosage and Distribution of Basic and Topdressing Nutrients on Yield and Quality of Tobacco Leaves

doi:10.11924/j.issn.1000-6850.casb2020-0654

Abstract

Abstract:

To improve the quality of tobacco leaves and clarify a nutritionally balanced fertilization system in flue-cured tobacco on lime purple soil, in 2018-2019, a field orthogonal experiment was carried out to study the effects of different dosage of NPK and the different proportion of NK on the agronomic characters, yield and chemical index of the tobacco. The results showed that: (1) NPK application rate had significant effect on agronomic traits of flue-cured tobacco, N had significant effect on SPAD and chemical composition, N and P had significant effect on yield, and the yield was positively correlated with N application rate; (2) N₂P₃K₂ (97.5, 150 and 315 kg/hm²) was the best fertilization combination for Guangyuan flue-cured tobacco; (3) the application of nitrogen fertilizer forward and potassium fertilizer backward was more conducive to improving the internal quality of tobacco leaves. Balanced fertilization system of flue-cured tobacco cultivation in Guangyuan is NPK application rate of 97.5, 150 and 315 kg/hm², respectively, and the nutrient allocation ratio of NK base fertilizer and top dressing fertilizer is N _{base: topdressing} = 7:3, K _{base: topdressing} = 3:7.

Key words: flue-cured tobacco, base fertilizer, topdressing, nutrient distribution ratio, yield and quality of tobacco leaves

CLC Number:

S147

Yu Yaoying, Wang Mingfu, He Jixian, Zhang Qili, Chen Liping, Jiang Hao, Gu Huizhan. Effects of N, P, K Dosage and Distribution of Basic and Topdressing Nutrients on Yield and Quality of Tobacco Leaves[J]. Chinese Agricultural Science Bulletin, 2021, 37(23): 52-60.

Figures/Tables 15

References 22

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处理	水平			施肥量/(kg/hm²)
处理	N	P₂O₅	K₂O	N	P₂O₅	K₂O
1	1	1	1	82.5	105.0	270.0
2	1	2	2	82.5	127.5	315.0
3	1	3	3	82.5	150.0	360.0
4	2	1	2	97.5	105.0	315.0
5	2	2	3	97.5	127.5	360.0
6	2	3	1	97.5	150.0	270.0
7	3	1	3	112.5	105.0	360.0
8	3	2	1	112.5	127.5	270.0
9	3	3	2	112.5	150.0	315.0

处理	水平			施肥量/(kg/hm²)
处理	N	P₂O₅	K₂O	N	P₂O₅	K₂O
1	1	1	1	82.5	105.0	270.0
2	1	2	2	82.5	127.5	315.0
3	1	3	3	82.5	150.0	360.0
4	2	1	2	97.5	105.0	315.0
5	2	2	3	97.5	127.5	360.0
6	2	3	1	97.5	150.0	270.0
7	3	1	3	112.5	105.0	360.0
8	3	2	1	112.5	127.5	270.0
9	3	3	2	112.5	150.0	315.0

处理	N	K₂O
C₁	7:3	5:5
C₂	7:3	4:6
C₃	7:3	3:7
C₄	6:4	5:5
C₅	6:4	4:6
C₆	6:4	3:7
C₇	5:5	5:5
C₈	5:5	4:6
C₉	5:5	3:7

处理	N	K₂O
C₁	7:3	5:5
C₂	7:3	4:6
C₃	7:3	3:7
C₄	6:4	5:5
C₅	6:4	4:6
C₆	6:4	3:7
C₇	5:5	5:5
C₈	5:5	4:6
C₉	5:5	3:7

隶属度	抛物线型							S型
隶属度	总糖	还原糖	总氮	烟碱	氮碱比	糖碱比	氯	钾	钾氯比
x₁	10.0	11.5	1.1	1.2	0.55	2.0	0.2	0.8	0.8
x₂	20.0	19.0	2.0	2.1	0.95	8.5	0.3
x₃	28.0	20.0	2.3	2.4	1.05	9.5	0.8
x₄	35.0	27.0	3.4	3.5	1.45	15.0	1.2	2.5	8.0
权重	10.00	9.55	9.98	12.27	10.82	12.79	12.23	10.57	11.78