Different Types of Rape Straw in Tobacco Growing Areas: Decomposition and Nutrient Release Characteristics

doi:10.11924/j.issn.1000-6850.casb2023-0602

Abstract

Abstract:

To analyze the decomposition characteristics of different types of rapeseed straw and determine suitable rapeseed varieties for cultivation in Shandong and Sichuan tobacco-growing areas, as well as for rotation planting with tobacco, two different types of four winter rapeseed varieties were selected as materials. The nylon mesh bag method was employed to analyze the decomposition and nutrient release characteristics of rapeseed straw under indoor simulated field conditions. The results showed that in the first 10 days of cultivation, rapeseed straw decomposed rapidly, with nutrients being released rapidly as well. The final nutrient release rate followed the order K > N > P > C. During the decomposition process, the carbon-to-nitrogen ratio of straw fluctuated but generally showed an increasing trend. The decomposition degree of Chinese cabbage-type rapeseed straw and the release rates of carbon and nitrogen were higher than those of kale-type rapeseed straw, while the potassium release rate was lower than that of kale-type rapeseed straw, and the phosphorus release rate exhibited regional differences. The decomposition degree of rapeseed straw and the release rates of carbon, nitrogen, and phosphorus in Sichuan tobacco-growing areas were higher than those in Shandong tobacco-growing areas, and the potassium release rate was higher than that of Chinese cabbage-type rapeseed straw in Shandong. The decomposition of rapeseed straw significantly increased the content of organic matter, nitrogen, phosphorus, and potassium in the tested soil. However, the degree of enhancement varied among different tobacco-growing areas and types of rapeseed straw. From the perspective of straw return utilization, Chinese cabbage-type rapeseed varieties in both tobacco-growing areas are more suitable for rotation planting with tobacco.

Key words: tobacco-growing area, Brassica rapa L., Brassica napus L., rape straw, straw decomposition, decomposition characteristics, nutrient release, soil nutrients, rotation planting, soil improvement

XIAO Lixia, ZHANG Yuqin, LIU Chunju, TAN Xiaolei, LING Aifen, WANG Dequan, HAN Shuo, MA Ruhui, SUN Yanguo. Different Types of Rape Straw in Tobacco Growing Areas: Decomposition and Nutrient Release Characteristics[J]. Chinese Agricultural Science Bulletin, 2024, 40(24): 28-35.

Figures/Tables 9

References 30

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烟区	有机质/(g/kg)	总氮/(g/kg)	总磷/(g/kg)	总钾/(g/kg)	碳氮比
山东诸城	7.24b	0.52b	0.83a	19.09b	8.07a
四川西昌	12.63a	1.19a	0.45b	20.20a	6.16b

烟区	有机质/(g/kg)	总氮/(g/kg)	总磷/(g/kg)	总钾/(g/kg)	碳氮比
山东诸城	7.24b	0.52b	0.83a	19.09b	8.07a
四川西昌	12.63a	1.19a	0.45b	20.20a	6.16b

烟区	油菜类型	总碳/(g/kg)	总氮/(g/kg)	总磷/(g/kg)	总钾/(g/kg)	碳氮比
山东	白菜型	367.57a	4.53a	1.11a	13.58a	81.19b
山东	甘蓝型	352.53b	3.13b	1.03b	10.49b	112.62a
四川	白菜型	345.20b	4.94a	1.07a	19.91a	69.89b
四川	甘蓝型	349.93a	3.48b	0.79b	17.91b	100.56a

烟区	油菜类型	总碳/(g/kg)	总氮/(g/kg)	总磷/(g/kg)	总钾/(g/kg)	碳氮比
山东	白菜型	367.57a	4.53a	1.11a	13.58a	81.19b
山东	甘蓝型	352.53b	3.13b	1.03b	10.49b	112.62a
四川	白菜型	345.20b	4.94a	1.07a	19.91a	69.89b
四川	甘蓝型	349.93a	3.48b	0.79b	17.91b	100.56a

烟区	类型	有机质/(g/kg)	氮/(g/kg)	/(g/kg)	钾/(g/kg)
山东	基础土样	7.24c	0.52c	0.83c	19.09c
	白菜型油菜	10.29a	0.68a	0.95b	20.48a
	甘蓝型油菜	10.12b	0.62b	1.03a	20.28b
四川	基础土样	12.63b	1.19b	0.45c	20.2c
	白菜型油菜	18.26a	1.34a	0.5b	22.09a
	甘蓝型油菜	18.29a	1.35a	0.54a	21.88b