Regulatory Effects of Nitrogen Fertilizer and Separate Roots on the Interspecific Relationship and Intercropping Dominance in Oilseed Flax/Soybean Intercropping System

doi:10.11924/j.issn.1000-6850.casb2020-0510

Abstract

Abstract:

The paper aims to optimize the interspecific relationship of intercropping crops by rational using nitrogen fertilizer and root separation model technology, for further exerting interspecific advantages. The pot experiment was adopted to study the effects on advantages and disadvantages, and interspecific competitiveness under different nitrogen fertilization modes including no nitrogen application(N0) and ¹⁵N 80 mg/kg (N80) and different root systems including completely separated(T1), root system no separation(T2) and root system separated by nylon net(T3) in oilseed flax/soybean intercropping system. The results showed that the dry matter accumulation of oilseed flax had no significant difference among different treatments. The dry matter accumulation of soybean in whole growth period under the treatment of N80 was significantly higher than that of N0 treatment. The effective pod number per plant, seed number per pod, 1000-grain weight and grain yield of oilseed flax under N80T2 treatment were the highest. Among them, the grain yield was 41.94%-137.84% higher than that of other treatments. The nodule number of soybean was N0>N80. The pod number per plant, the seed number per pod and the 100-grain weight were the highest under N80T2 treatment. The grain yield of N80T3 treatment was the highest and 4.33%-13.99% higher than that of other treatments, and its difference with N80T2 treatment was significant. The land equivalent ratio of all treatments was greater than 2, and it was the maximum under N80T2 treatment. The interspecific competitiveness under the T2 treatment showed that oilseed flax was stronger than soybean (A_F>0, CR_F>1), but it was the opposite under T3 treatment (A_F<0, CR_F<1). The results indicate that the application of ¹⁵N 80 mg/kg and non-separation of roots in oilseed flax/soybean intercropping system is beneficial to coordinate the inter-specific relationship between oilseed flax and soybean, and it can promote the crop grain yield.

Key words: flax, soybean, dry matter accumulation, land equivalence ratio, interspecific competitiveness, grain yield

CLC Number:

Ruan Wenhao, Gao Yuhong, Wu Bing, Yan Bin, Wang Yifan, Cui Zhengjun, Zhao Bangqing, Cao Zhi. Regulatory Effects of Nitrogen Fertilizer and Separate Roots on the Interspecific Relationship and Intercropping Dominance in Oilseed Flax/Soybean Intercropping System[J]. Chinese Agricultural Science Bulletin, 2021, 37(13): 14-21.

Figures/Tables 7

References 28

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处理		单株有效蒴果数	每果粒数	千粒重/g	籽粒产量/(g/株)
N0	T1	18.33±0.88b	4.88±0.19cd	4.55±0.12a	0.41±0.04cd
	T2	21.33±1.45b	5.88±0.21b	4.96±0.21a	0.62±0.05b
	T3	18.00±0.00b	4.18±0.03d	5.09±0.12a	0.38±0.03d
N80	T1	20.33±2.08b	5.36±0.23bc	5.22±0.50a	0.57±0.06bc
	T2	24.66±4.51a	6.50±0.59a	5.47±0.56a	0.88±0.03a
	T3	18.00±2.00b	4.50±0.22cd	4.59±0.26a	0.37±0.05cd

处理		单株有效蒴果数	每果粒数	千粒重/g	籽粒产量/(g/株)
N0	T1	18.33±0.88b	4.88±0.19cd	4.55±0.12a	0.41±0.04cd
	T2	21.33±1.45b	5.88±0.21b	4.96±0.21a	0.62±0.05b
	T3	18.00±0.00b	4.18±0.03d	5.09±0.12a	0.38±0.03d
N80	T1	20.33±2.08b	5.36±0.23bc	5.22±0.50a	0.57±0.06bc
	T2	24.66±4.51a	6.50±0.59a	5.47±0.56a	0.88±0.03a
	T3	18.00±2.00b	4.50±0.22cd	4.59±0.26a	0.37±0.05cd

处理		单株结荚数	每荚粒数	百粒重/g	籽粒产量/(g/株)
N0	T1	18.21±1.21c	2.10±0.01d	18.56±0.08c	4.86±0.11c
	T2	19.11±0.98bc	2.12±0.02cd	19.16±0.05c	5.13±0.14c
	T3	19.62±1.32abc	2.14±0.01bc	19.23±0.03bc	5.25±0.08bc
N80	T1	20.08±0.92abc	2.16±0.01ab	19.21±0.04b	5.31±0.12b
	T2	21.35±0.27a	2.18±0.01a	19.36±0.04a	5.46±0.07a
	T3	20.04±1.32ab	2.16±0.02ab	19.24±0.03a	5.54±0.14a

处理		单株结荚数	每荚粒数	百粒重/g	籽粒产量/(g/株)
N0	T1	18.21±1.21c	2.10±0.01d	18.56±0.08c	4.86±0.11c
	T2	19.11±0.98bc	2.12±0.02cd	19.16±0.05c	5.13±0.14c
	T3	19.62±1.32abc	2.14±0.01bc	19.23±0.03bc	5.25±0.08bc
N80	T1	20.08±0.92abc	2.16±0.01ab	19.21±0.04b	5.31±0.12b
	T2	21.35±0.27a	2.18±0.01a	19.36±0.04a	5.46±0.07a
	T3	20.04±1.32ab	2.16±0.02ab	19.24±0.03a	5.54±0.14a

处理		籽粒产量				生物学产量
处理		总产量/ (g/株)	胡麻土地当量比	大豆土地当量比	籽粒土地当量比	总产量/ (g/株)	胡麻土地当量比	大豆土地当量比	生物学土地当量比
N0	T1	5.27±0.09c	–	–	–	7.49±0.21d	–	–	–
	T2	5.75±0.11b	1.50±0.02a	1.06±0.02ab	2.56±0.02a	9.61±0.06a	1.00±0.03a	1.74±0.12a	2.74±0.12a
	T3	5.63±0.06b	0.92±0.02b	1.08±0.01a	2.00±0.02b	8.89±0.14b	1.06±0.01a	1.40±0.08b	2.46±0.08b
N80	T1	5.88±0.10b	–	–	–	8.29±0.06c	–	–	–
	T2	6.34±0.06a	1.55±0.07a	1.03±0.01c	2.58±0.07a	9.48±0.17a	1.02±0.03a	1.30±0.04b	2.32±0.05b
	T3	5.91±0.11b	0.65±0.01c	1.04±0.00bc	1.69±0.01c	9.54±0.09a	0.90±0.01b	1.48±0.02b	2.38±0.02b