Crops ›› 2025, Vol. 41 ›› Issue (1): 187-193.doi: 10.16035/j.issn.1001-7283.2025.01.023

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Effects of Nitrogen Application on Yield, Nitrogen Accumulation, and Interspecific Relationships of Oat Intercropped with Clover

Han Xue1(), Wang Ying1, Han Dongyu1, Zhao Xinyao1, Li Xiaoting2, Zhang Hongjie1, Li Lijun1()   

  1. 1Agricultural College of Inner Mongolia Agricultural University, Hohhot 010019, Inner Mongolia, China
    2College of Grassland Science, Shanxi Agricultural University, Jinzhong 030801, Shanxi, China
  • Received:2023-11-09 Revised:2024-01-08 Online:2025-02-15 Published:2025-02-12

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Abstract:

To clarify the effect of nitrogen application on the productivity of oat intercropped with clover system, we set up three nitrogen application modes, no nitrogen application (N0), 75 (N75), and 150 kg/ha (N150) under three cropping patterns, oat intercropping with clover, oat monocropping, and clover monocropping. We explored the effects of different treatments on crop nitrogen accumulation, forage yield, and interspecific relationships. The results showed that intercropped oats with clover significantly increased oat forage yield by 14.45%-29.26%, and only decreased clover forage yield by 1.60%-6.97%. Nitrogen fertilization increased forage yield and intercropping productivity of oats and clover, land equivalent ratios of N0, N75, and N150 were 1.07, 1.15, and 1.19, respectively; N75 treatment significantly increased oat forage yield by 18.83% to 29.99% compared to N0, and N150 treatment only increased oat yield by 4.60% to 8.01% compared to N75; oats intercropped with clover significantly increased crop nitrogen accumulation compared to monocropping, in which oats increased by 16.47%-23.09%, and clover increased by 20.85%-26.60%; evaluation indexes of competitiveness indicated that oats in intercropping system had a higher yield advantage over clover, it showed gains compared to monocropping, and showed higher productivity in the intercropping system after N application. In comparison to monocropping, oats with clover demonstrated a greater yield and N accumulation in intercropping system. With N application, intercropping productivity might be further increased, making it a viable option for promotion in the area along the Yinshan Mountains in Inner Mongolia.

Key words: Intercropping, Nitrogen application, Yield, Nitrogen accumulation, Interspecific relationship

Fig.1

Forage yields of oat and clover under different treatments The different lowercase letters indicate significant differences (P < 0.05). The same below."

Fig.2

Plant nitrogen accumulation of oat and clover under different treatments"

Table 1

Effects of different nitrogen treatments on LER and K in oat and clover intercropping system"

施氮水平
Nitrogen application level		 土地当量比LER 相对拥挤系数K
LERo LERs LER Ko Ks K
N0 0.76±0.01b 0.31±0.01a 1.07±0.03c 1.62±0.10c 0.90±0.05a 1.45±0.04c
N75 0.83±0.02a 0.32±0.01a 1.15±0.02b 2.54±0.29b 0.93±0.04a 2.38±0.33b
N150 0.86±0.03a 0.33±0.02a 1.19±0.01a 3.12±0.03a 0.98±0.02a 3.04±0.04a

Table 2

Effects of different nitrogen treatments on A and CR in oat and clover intercropping system"

施氮水平
Nitrogen
application level		 侵占力
A		 竞争比率
CR
Ao As CRo CRs
N0 0.41±0.01b -0.41±0.01a 1.23±0.07a 0.81±0.04a
N75 0.45±0.01a -0.45±0.01a 1.31±0.04a 0.76±0.02a
N150 0.47±0.00a -0.47±0.00b 1.31±0.02a 0.76±0.01a

Table 3

Effects of different nitrogen treatments on ALY and SPI in oat and clover intercropping system"

施氮水平
Nitrogen application level		 实际产量损失AYL 系统生产力指数
SPI
AYLo AYLs AYL
N0 0.14±0.02c -0.07±0.04a 0.08±0.02c 4247.31±169.66b
N75 0.25±0.02b -0.05±0.03a 0.21±0.05b 5422.08±230.84b
N150 0.29±0.00a -0.02±0.01a 0.28±0.01a 5852.07±220.68a

Table 4

Effects of different nitrogen treatments on NER and N-RC in oat and clover intercropping system"

施氮水平
Nitrogen application level		 氮素当量比NER 氮素相对竞争力N-RC
NERo NERs NER N-RCo N-RCs N-RC
N0 0.77±0.06b 0.40±0.01a 1.18±0.06b 1.16±0.09a 1.21±0.03a -0.05±0.07a
N75 0.81±0.02a 0.41±0.02a 1.23±0.02a 1.22±0.03a 1.24±0.06a -0.02±0.08a
N150 0.82±0.01a 0.42±0.01a 1.24±0.02a 1.23±0.01a 1.27±0.04a -0.04±0.04a
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