Intercropping Effect and Nitrogen Transfer Characteristics of Oat-Mungbean Intercrop

doi:10.11983/CBB22176

Abstract

Abstract: To explore the intercropping effect and nitrogen transfer characteristics of oat and mungbean, three planting patterns, oat monocropping, mungbean monocropping, oat-mungbean intercropping, were investigated with both root-digging method and ¹⁵N isotope labelling method. The results showed that in intercropping system, oat displayed higher invasiveness than mungbean, whose growth was inhibited. The dry matter accumulation of oat shoot was 14.9%-33.1% higher in intercropping than in monoculture in the whole growing stages. Compared with monocropping, the nitrogen accumulation of oat at two year mature stages was increased by 53.1% and 44.8%, respectively. The intercropping system reduced nitrogen accumulation, nodule weight at flowering and pod stage, and nitrogen fixation efficiency of mungbean. The total nitrogen fixation efficiency of mungbean decreased by 23.7% and the biological nitrogen fixation decreased by 11.66% on average for two years. The nitrogen transfer rate of intercropped mungbean to oat reached 31.7%, and the nitrogen transfer amount was 212.16 kg∙hm^-2. The oat-mungbean intercropping decreased nodule nitrogenase activity and nitrogen fixation efficiency of mungbean at flowering and pod stage, but nitrogen transfer in mungbean increased nitrogen uptake and utilization of oat, realized the mutual regulation and promotion between the growth of above and below ground, and meanwhile, optimized the nitrogen management system in farmland ecosystem.

Key words: oat-mungbean intercrop, nodule N fixation, ¹⁵N isotope labelling, N uptake, N transfer

Xiaomin Feng, Xiang Gao, Huadong Zang, Yuegao Hu, Changzhong Ren, Zhiping Hao, Huiqing Lü, Zhaohai Zeng. Intercropping Effect and Nitrogen Transfer Characteristics of Oat-Mungbean Intercrop[J]. Chinese Bulletin of Botany, 2023, 58(1): 122-131.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB22176

https://www.chinbullbotany.com/EN/Y2023/V58/I1/122

Figures/Tables 6

Figure 1 Schematic diagram of oat-mungbean intercropping in the field

Figure 2 Interspecific relative competitiveness of oat-mungbean intercropping system

Figure 3 Dry matter accumulation amount of oat (A) and mungbean (B) in different growing stage under different cropping mode O: Oat monocropping; M: Mungbean monocropping; MO: Oat intercropped with mungbean; OM: Mungbean intercropped with oat. Different lowercase letters indicate significant differences among different treatments (P<0.05).

Figure 4 Effect of the intercropping on nitrogen accumulation of oat (A) and mungbean (B) O, M, MO, and OM are the same as in Figure 3. Different lowercase letters indicate significant differences among different treatments (P<0.05).

Table 1 Effect of intercropping on nodule and nitrogen fixation of mungbean

Year	Treatments	Weight of nodules (g)	Nitrogenase activity (nmol C₂H₂·h^-1·plant^-1)	%NDFA	Biological nitrogen fixation (g?plant^-1)
2013	M	3.29 a	1.64 a	66.23 a	19.68 a
	OM	2.14 b	1.48 a	62.04 a	15.56 b
2014	M	3.89 a	3.11 b	64.89 b	17.05 a
	OM	2.79 b	2.55 a	58.56 a	16.64 a

Table 2 Nitrogen translation from mungbean to oat in the intercropping system

Year	Treatments	¹⁵N atom percent excess	¹⁵N uptake (mg?plant^-1)	%NTFL	N transfer (kg?hm^-2)
2013	O	0.5720 b	0.36 a	-	-
2013	MO	0.7563 a	0.39 a	32.2	215.28
2014	O	0.6102 b	0.40 b	-	-
2014	MO	0.8010 a	0.54 a	31.2	209.04

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