Effects of Biochar Application to Three Types of Soils on the Uptake of Nitrogen and Potassium in Flue-cured Tobacco

doi:10.11923/j.issn.2095-4050.cjas2022-0122

Abstract

Abstract:

A pot experiment was conducted at Hetian S&T Research Station of Bijie in Guizhou Province, to explore the effect of biochar application rate on nitrogen (N) and potassium (K) uptake in flue-cured tobacco. A factorial design with two factors (3 types of soils × 5 biochar rates) and a completely randomized layout were used in this experiment. Soil samples of yellow soil, yellow brown soil and calcareous soil were collected from tobacco planting field (0-20 cm). The biochar application rate was 0%, 0.1%, 1%, 2.5% and 5.0% (w/w, equivalent to 0, 1.25, 12.5, 31.3, 62.5 t/hm² of field use). The results showed that: compared with the control (no biochar application), under the biochar application rate of 5.0%, the number of lateral roots per tobacco plant in yellow soil, calcareous soil and yellow brown soil increased by 17.0, 30.7 and 20.3, respectively, 150.0%, 137.4%, and 67.1% higher than that of the control, respectively. With the increase of biochar rate, the N uptake of tobacco roots, stems, leaves and whole plant increased, but the biochar rates for the highest N uptake by tobacco plants in different types of soils were different. With the biochar rate increase, the K content of roots and leaves of tobacco increased, with the maximum increase of 47.8% and 32.3%, respectively, and the K content of roots increased most obviously. The K uptake in roots, stems and leaves of tobacco increased continuously, with the maximum increase of 311.8%, 87.9% and 144.7%, respectively. In conclusion, the application of biochar can significantly increase the number of lateral roots of tobacco plants, and raise the uptake of N and K in tobacco.

Key words: biochar, flue-cured tobacco, nitrogen, potassium, soil type, interaction

LI Caibin, ZHANG Jiuquan, HE Yi. Effects of Biochar Application to Three Types of Soils on the Uptake of Nitrogen and Potassium in Flue-cured Tobacco[J]. Journal of Agriculture, 2023, 13(9): 54-62.

Figures/Tables 8

References 33

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性状	黄壤	石灰土	黄棕壤
pH	7.20±0.03A	6.37±0.04B	7.23±0.01A
总有机碳/(g/kg)	33.4±4.0A	34.4±0.4A	23.9±0.2B
NH₄⁺-N/(mg/kg)	0.33±0.13B	4.96±1.34A	0.08±0.04B
NO₃^--N/(mg/kg)	76.98±3.37A	25.56±5.19C	48.33±8.21B
有效K/(mg/kg)	125.47±9.26A	53.05±8.67B	47.17±6.43B

性状	黄壤	石灰土	黄棕壤
pH	7.20±0.03A	6.37±0.04B	7.23±0.01A
总有机碳/(g/kg)	33.4±4.0A	34.4±0.4A	23.9±0.2B
NH₄⁺-N/(mg/kg)	0.33±0.13B	4.96±1.34A	0.08±0.04B
NO₃^--N/(mg/kg)	76.98±3.37A	25.56±5.19C	48.33±8.21B
有效K/(mg/kg)	125.47±9.26A	53.05±8.67B	47.17±6.43B

性状	测定数值
pH	9.50±0.46
总碳/(g/kg)	602±34
总N/(g/kg)	20.2±1.2
K/(g/kg)	6.12±0.25
CEC/(cmol/kg)	110±6

性状	测定数值
pH	9.50±0.46
总碳/(g/kg)	602±34
总N/(g/kg)	20.2±1.2
K/(g/kg)	6.12±0.25
CEC/(cmol/kg)	110±6

土壤		炭用量		生物量					冠根比
土壤		炭用量		茎		叶	根		冠根比
黄壤		0		14.06±2.42dC		47.36±6.52cB	7.04±1.46cB		8.98±0.56aB
		0.1		26.18±1.42cC		63.36±2.54bB	11.46±0.52bB		7.83±0.16bA
		1.0		30.8±1.24bC		76.42±3.12bB	14.84±0.68bB		7.24±0.12bcA
黄壤	2.5		35.94±0.90abC		84.34±0.94abB			18.10±0.28abB		6.65±0.01cA
黄壤	5.0		40.16±0.76aC		92.86±4.22aB			20.54±0.10aB		6.47±0.17cA
石灰土	0		59.38±0.84dA		82.96±9.26dA			13.80±2.26cA		10.62±0.85bA
	0.1		63.70±0.46cdA		111.22±2.48cA			28.80±0.42bA		6.07±0.05bB
	1.0		65.08±0.68bcA		121.74±0.24bcA			31.08±0.06bA		6.01±0.01bB
	2.5		71.04±1.88bA		131.68±3.14bA			32.26±0.08bA		6.28±0.11bA
	5.0		82.80±4.38aA		168.54±8.68aA			38.98±3.20aA		6.49±0.25aA
黄棕壤	0		43.08±2.62dB		93.68±6.98dA			21.68±2.56cA		6.39±0.30aC
	0.1		49.26±0.90cB		113.28±4.14cA			27.40±0.36bA		5.93±0.09aB
	1.0		53.78±0.98bcB		120.94±2.22cA			28.44±0.32bA		6.14±0.03aB
	2.5		56.54±0.96bB		137.22±0.50bA			30.00±0.16bA		6.46±0.01aA
	5.0		66.76±3.90aB		153.32±4.80aA			37.02±3.34aA		6.02±0.34aA
变因
土壤			<0.0001^**		<0.0001^**			<0.0001^**		<0.0001^**
炭用量			<0.0001^**		<0.0001^**			<0.0001^**		<0.0001^**
交互作用			0.16		0.028^*			0.011^*		<0.0001^**