基于北纬30°分界的长江中游油菜增产策略研究

doi:10.3724/SP.J.1006.2026.55049

Abstract

Abstract:

To elucidate the effects of major climatic factors and key agronomic traits on yield formation of winter rapeseed in the middle Yangtze Basin, this study takes the 30°N latitude as a geographical boundary to systematically compare the ecological adaptability and yield-determining factors of winter rapeseed between northern and southern regions. The objective is to provide a theoretical foundation and practical guidance for optimizing regional line selection and precision cultivation. Four representative growing seasons, characterized by distinct climatic conditions—namely warm and dry, cold and humid, and years with strong climate variability—were selected (2006-2007, 2009-2010, 2016-2017, and 2019-2020). Field experiments were conducted across six national winter rapeseed regional trial stations located north and south of the 30°N line. Comprehensive agronomic data were collected for all tested lines, and corresponding monthly climate data were compiled. The impacts of climatic factors on yield, as well as variations in agronomic traits and their synergistic contributions to yield, were analyzed using multiple statistical methods. Results showed that the northern region (north of 30°N) experienced lower winter temperatures, a greater diurnal temperature range, relatively reduced precipitation, and less sunshine during early growth stages, but more sunshine during later stages. In contrast, the southern region (south of 30°N) was relatively warmer, with higher rainfall and reduced sunlight during late growth stages. On average, the northern region achieved significantly higher yields than the southern region by 779.1 kg hm^-2 (P < 0.01). It also exhibited higher yield per plant and more siliques per plant, although it faced higher disease pressure. Stepwise regression analysis indicated that yield in the northern region was mainly influenced by April precipitation, while in the southern region it was primarily affected by December sunshine duration and March precipitation. Path analysis further revealed that yield in the north was directly determined by yield per plant and seed number per silique. In the south, yield was more dependent on the combined effects of yield per plant and thousand-seed weight, and the negative impact of excessive branching and seed size needed to be managed. Broadly adapted lines such as 0112, 9ZYYP27, and Keleyou 4 performed well across both ecological zones, while lines such as Hua 68P25, Yuhua 7, and Yueyou 577 showed strong region-specific adaptability. Significant ecological divergence exists across the 30°N boundary in terms of climatic resources, yield components, and dominant agronomic traits. Regional patterns of light, temperature, and water availability significantly influence yield formation mechanisms. It is recommended that the northern region focus on optimizing early-season light utilization and enhancing resistance to late-season waterlogging, prioritizing lines with Sclerotinia stem rot resistance, and high yield per plant with strong seed number and weight. For the southern region, emphasis should be placed on optimizing mid-to-late season light use and developing lines with high photosynthetic efficiency, waterlogging resistance, high yield per plant, more seeds, and elevated oil content. A regional deployment strategy combining “broad adaptability and specific adaptation” is proposed to synergistically advance precision breeding and efficient cultivation, thereby promoting high and stable yields and green, sustainable development of winter rapeseed in the middle Yangtze Basin.

Key words: rapeseed, the middle Yangtze Basin, climatic factors, agronomic traits, yield optimization strategies, 30°N

Yang Rui, Chen Jing-Dong, Huang Ying, Zhang Xue-Kun, Zhou Deng-Wen, Liu Qing-Yun, Xu Jing-Song, Xie Ling-Li, Xu Ben-Bo. Region-specific yield optimization strategies for rapeseed (Brassica napus L.) in the middle Yangtze Basin across the 30°N latitude[J].Acta Agronomica Sinica, 2026, 52(1): 99-117.

Figures/Tables 9

Fig. 1

Table S1

Table S2

Detailed information of tested lines"

年份Year	品系编号 Line code	品系名称 Line name	类型 Type	芥酸 Erucic acid (%)	硫甙 Glucosinolate content (µmol g^-1)	含油量 Oil content (%)
2006	36	K219	杂交系Hybrid line	0.1	17.38	41.49
2006	28	H0202	杂交系Hybrid line	0.2	19.10	42.58
2006	149	杂695 Za 695	杂交系Hybrid line	0.1	19.07	45.08
2006	164	中油98D Zhongyou 98D	杂交系Hybrid line	0	23.07	44.65
2006	152	浙油5002 Zheyou 5002	自交系Inbred line	0	23.46	45.57
2006	34	H9958	杂交系Hybrid line	0.2	19.36	41.39
2006	140	油研1707 Youyan 1707	杂交系Hybrid line	0.5	17.14	45.29
2006	11	56602	自交系Inbred line	0.1	19.94	47.17
2006	14	06杂996 06 za 996	杂交系Hybrid line	0	16.22	43.39
2006	136	扬6614 Yang 6614	自交系Inbred line	0.9	29.56	43.52
2006	165	中油杂2号 Zhongyouza 2	杂交系Hybrid line	0	19.06	42.84
2006	1	112	杂交系Hybrid line	0	23.66	45.86
2006	47	滁核杂1号 Chuheza 1	杂交系Hybrid line	0.2	19.94	43.07
2006	44	V033-118	杂交系Hybrid line	0.1	24.68	44.31
2006	166	中种油1号 Zhongzhongyou 1	杂交系Hybrid line	0	18.43	45.31
2006	33	H9953	杂交系Hybrid line	—	—	—
2006	70	富油2号 Fuyou 2	杂交系Hybrid line	0.3	23.05	41.86
2006	24	EYZ06-14	杂交系Hybrid line	0.3	29.80	41.69
2006	9	6788	杂交系Hybrid line	0	17.52	43.12
2006	114	三北98 Sanbei 98	杂交系Hybrid line	0.4	17.94	46.76
2006	150	杂839 Za 839	杂交系Hybrid line	0.1	17.30	45.08
2006	8	5730	杂交系Hybrid line	0	17.08	43.74
2006	6	2105	杂交系Hybrid line	0.2	22.92	43.43
2006	81	沪油杂4号 Huyouza 4	杂交系Hybrid line	0	28.86	43.27
2006	65	德油22-1 Deyou 22-1	杂交系Hybrid line	0	18.92	44.01
2006	43	T1839	杂交系Hybrid line	0.1	19.18	43.47
2006	153	浙油6001 Zheyou 6001	自交系Inbred line	0	23.52	45.48
2006	21	B351	杂交系Hybrid line	0	26.32	45.07
2006	37	K565	杂交系Hybrid line	0	21.38	45.59
2009	22	C926	杂交系Hybrid line	0	21.66	41.15
2009	167	卓信058 Zhuoxin 058	杂交系Hybrid line	0.1	20.57	43.72
2009	39	K805	杂交系Hybrid line	0	18.19	41.28
2009	46	V6-22	杂交系Hybrid line	0.1	19.68	40.02
2009	120	圣光95 Shengguang 95	杂交系Hybrid line	0.5	29.81	40.28
2009	80	沪油21 Huyou 21	自交系Inbred line	0.1	20.07	39.94
2009	12	03杂-14 03 za-14	杂交系Hybrid line	0.1	29.64	44.74
2009	71	赣油杂6号 Ganyouza 6	杂交系Hybrid line	0.1	17.56	44.63
2009	151	杂油2008 Zayou 2008	杂交系Hybrid line	0	24.67	41.46
2009	138	阳光2009 Yangguang 2009	自交系Inbred line	0.1	19.92	42.92
2009	29	H0602	杂交系Hybrid line	0.9	25.48	44.66
2009	57	大地16 Dadi 16	杂交系Hybrid line	0.2	21.81	43.56
2009	78	禾盛油868 Heshengyou 868	杂交系Hybrid line	0.3	24.71	41.98
2009	155	中农油9号 Zhongnongyou 9	杂交系Hybrid line	0.6	20.88	42.88
2009	67	丰油9号 Fengyou 9	杂交系Hybrid line	1.2	35.55	39.51
2009	50	川农油3号 Chuannongyou 3	杂交系Hybrid line	0.2	18.09	41.64
2009	64	德68-12 De 68-12	杂交系Hybrid line	0.4	26.18	41.10
2009	41	SY05-1	杂交系Hybrid line	0	29.12	40.83
2009	35	JY939	杂交系Hybrid line	0	20.14	38.27
2009	15	09-崇26 09-chong 26	杂交系Hybrid line	0.1	24.52	41.47
2009	146	杂499 Za 499	杂交系Hybrid line	0	21.91	43.14
2009	23	C935	杂交系Hybrid line	0.3	27.16	46.04
2009	30	H1717	杂交系Hybrid line	0	19.40	43.30
2009	62	大地69 Dadi 69	杂交系Hybrid line	0	20.73	41.72
2009	17	36P47	杂交系Hybrid line	0.1	18.87	46.00
2009	38	K586	杂交系Hybrid line	0	22.05	42.48
2009	10	8686	杂交系Hybrid line	0	22.11	41.29
2009	5	928	杂交系Hybrid line	0	24.87	40.56
2009	13	06-L-2Q	杂交系Hybrid line	0.6	28.06	40.94
2009	27	G142	自交系Inbred line	0	25.47	45.22
2009	4	590	杂交系Hybrid line	0.5	22.63	43.13
2009	2	507	杂交系Hybrid line	0	29.78	43.89
2009	66	德油杂10号 Deyouza 10	杂交系Hybrid line	0	21.50	41.26
2009	85	华航901 Huahang 901	自交系Inbred line	0	24.19	43.26
2009	154	中农油6号 Zhongnongyou 6	杂交系Hybrid line	0.1	19.01	44.52
2009	18	86P14	杂交系Hybrid line	0	17.30	46.60
2009	3	589	自交系Inbred line	0	17.53	44.08
2009	45	V037-77	杂交系Hybrid line	0	25.82	41.76
2009	147	杂529 Za 529	杂交系Hybrid line	0	21.74	43.66
2009	40	QL8618	杂交系Hybrid line	0.7	27.90	46.12
2009	16	36P14	杂交系Hybrid line	0	18.24	47.80
2009	148	杂613 Za 613	杂交系Hybrid line	0	18.48	44.28
2009	49	楚油杂79 Chuyouza 79	杂交系Hybrid line	0.2	25.13	45.04
2009	119	圣光86 Shengguang 86	杂交系Hybrid line	0.6	20.47	41.90
2009	79	核优488 Heyou 488	杂交系Hybrid line	0	17.59	42.62
2009	54	川杂NH352 Chuanza NH352	杂交系Hybrid line	0	19.24	43.28
2009	32	H4396	杂交系Hybrid line	0.2	20.96	44.61
2009	42	T1588	杂交系Hybrid line	0.1	25.18	43.27
2009	7	5102	杂交系Hybrid line	0	35.99	42.63
2009	77	禾盛油555 Heshengyou 555	杂交系Hybrid line	0.3	28.87	42.14
2016	156	中双3370 Zhongshuang 3370	自交系Inbred line	0	20.48	41.51
2016	59	大地193 Dadi 193	杂交系Hybrid line	0	21.52	45.87
2016	137	阳光165 Yangguang 165	杂交系Hybrid line	0.1	20.87	42.25
2016	74	汉油10号 Hanyou 10	杂交系Hybrid line	0	21.65	42.36
2016	123	希望122 Xiwang 122	杂交系Hybrid line	0.1	20.13	43.25
2016	134	秀油杂1号 Xiuyouza 1	杂交系Hybrid line	0	21.83	44.02
2016	69	沣油643 Fengyou 643	杂交系Hybrid line	0	19.99	44.97
2016	51	川油56 Chuanyou 56	杂交系Hybrid line	0.3	34.23	45.59
2016	144	渝油36 Yuyou 36	杂交系Hybrid line	0.1	20.90	44.64
2016	55	创油16号 Chuangyou 16	杂交系Hybrid line	0.4	20.40	44.46
2016	90	华油杂12号 Huayouza 12	杂交系Hybrid line	0.1	27.84	42.26
2016	124	希望152 Xiwang 152	杂交系Hybrid line	0.1	21.47	44.26
2016	162	中油619 Zhongyou 619	杂交系Hybrid line	0	22.79	46.67
2016	139	阳光736 Yangguang 736	自交系Inbred line	0.2	23.68	44.87
2016	93	华油杂703 Huayouza 703	杂交系Hybrid line	0	19.62	42.39
2016	88	华协82 Huaxie 82	杂交系Hybrid line	0.1	21.01	44.07
2016	68	沣油306 Fengyou 306	杂交系Hybrid line	0	29.61	45.29
2016	122	西油6号 Xiyou 6	杂交系Hybrid line	0	24.77	48.47
2016	113	蓉油30 Rongyou 30	杂交系Hybrid line	0.1	23.21	44.70
2016	75	豪油29 Haoyou 29	杂交系Hybrid line	0.6	74.95	41.65
2016	98	景油599 Jingyou 599	杂交系Hybrid line	0	25.61	48.14
2016	127	湘杂油352 Xiangzayou 352	杂交系Hybrid line	0	24.03	47.65
2016	141	渝华3号 Yuhua 3	杂交系Hybrid line	0.5	23.07	44.25
2016	117	圣光128 Shengguang 128	杂交系Hybrid line	0	20.59	44.03
2016	129	湘杂油512 Xiangzayou 512	杂交系Hybrid line	0	21.62	47.85
2016	92	华油杂653 Huayouza 653	杂交系Hybrid line	0.3	22.68	44.99
2016	96	金油杂158 Jinyouza 158	杂交系Hybrid line	0.2	21.14	44.81
2016	159	中油159 Zhongyou 159	自交系Inbred line	0.8	26.98	46.43
2016	158	中油153 Zhongyou 153	杂交系Hybrid line	0	21.72	43.08
2016	125	希望202 Xiwang 202	杂交系Hybrid line	0	23.16	43.55
2016	133	兴油杂19 Xingyouza 19	杂交系Hybrid line	0	24.63	44.16
2016	111	秦优1619 Qinyou 1619	杂交系Hybrid line	0	24.68	47.13
2016	105	南油846 Nanyou 846	杂交系Hybrid line	0	21.52	46.01
2016	126	希望402 Xiwang 402	杂交系Hybrid line	0.4	23.77	45.87
2016	60	大地199 Dadi 199	杂交系Hybrid line	0.1	23.71	47.35
2016	161	中油613 Zhongyou 613	杂交系Hybrid line	0.3	22.33	46.29
2016	115	陕油1309 Shaanyou 1309	杂交系Hybrid line	0	27.12	47.20
2016	91	华油杂28 Huayouza 28	杂交系Hybrid line	0	24.53	45.58
2016	128	湘杂油373 Xiangzayou 373	杂交系Hybrid line	0	21.86	48.28
2016	135	亚华油207 Yahuayou 207	杂交系Hybrid line	0	20.73	43.57
2016	63	德5油319 De 5 you 319	杂交系Hybrid line	0.2	29.55	49.55
2016	110	秦荣5号 Qinrong 5	杂交系Hybrid line	0	29.47	45.30
2016	97	景油517 Jingyou 517	杂交系Hybrid line	0	24.74	49.64
2016	58	大地192 Dadi 192	杂交系Hybrid line	0	25.08	44.66
2019	109	黔杂18J32 Qianza 18J32	杂交系Hybrid line	0.6	26.80	43.22
2019	157	中双C35 Zhongshuang C35	自交系Inbred line	0	34.68	48.26
2019	61	大地591 Dadi 591	杂交系Hybrid line	0.2	23.07	49.18
2019	163	中油861 Zhongyou 861	杂交系Hybrid line	0	24.42	48.54
2019	101	利油518 Liyou 518	自交系Inbred line	0	23.59	46.58
2019	56	大地117 Dadi 117	杂交系Hybrid line	0.1	22.31	48.26
2019	73	国盛油7号 Guoshengyou 7	自交系Inbred line	0.1	24.35	48.14
2019	100	科乐油4号 Keleyou 4	杂交系Hybrid line	0.3	21.39	43.70
2019	99	景油830 Jingyou 830	杂交系Hybrid line	0.2	23.16	48.43
2019	132	兴油666 Xingyou 666	自交系Inbred line	0	22.62	47.22
2019	20	9ZYYP27	杂交系Hybrid line	0.1	21.83	47.60
2019	83	华2015TP6 Hua 2015TP6	杂交系Hybrid line	0	22.55	45.89
2019	48	楚禾油937 Chuheyou 937	杂交系Hybrid line	2.6	23.10	45.96
2019	108	宁杂173 Ningza 173	杂交系Hybrid line	0	22.14	44.90
2019	95	华杂875 Huaza 875	杂交系Hybrid line	0	21.09	42.77
2019	52	川油91 Chuanyou 91	杂交系Hybrid line	0	44.47	46.89
2019	143	渝黄9号 Yuhuang 9	杂交系Hybrid line	0.7	27.02	46.86
2019	112	秦优1919 Qinyou 1919	杂交系Hybrid line	0	29.12	46.24
2019	104	南油759 Nanyou 759	杂交系Hybrid line	0	21.56	45.38
2019	121	天禾油23 Tianheyou 23	杂交系Hybrid line	0	21.58	44.55
2019	25	FY19-31	杂交系Hybrid line	0.1	28.14	45.48
2019	19	9ZYYP12	杂交系Hybrid line	0	24.08	49.80
2019	160	中油510 Zhongyou 510	杂交系Hybrid line	0	22.18	45.57
2019	89	华油2133 Huayou 2133	杂交系Hybrid line	0.1	21.86	43.76
2019	87	华秦油971 Huaqinyou 971	杂交系Hybrid line	0	23.85	47.80
2019	106	内油6054 Neiyou 6054	杂交系Hybrid line	0	20.55	43.71
2019	142	渝华7号 Yuhua 7	杂交系Hybrid line	0.1	21.62	43.50
2019	76	豪油杂98 Haoyouza 98	杂交系Hybrid line	0	24.64	43.18
2019	107	宁杂161 Ningza 161	杂交系Hybrid line	0.1	22.35	46.32
2019	102	米油599 Miyou 599	杂交系Hybrid line	0.3	20.80	42.42
2019	31	H1951	杂交系Hybrid line	1.0	22.84	47.74
2019	84	华68P25 Hua 68P25	杂交系Hybrid line	0	24.00	49.72
2019	26	FY19-68	杂交系Hybrid line	0.4	21.23	42.66
2019	130	湘杂油972 Xiangyouza 972	杂交系Hybrid line	0	22.45	46.98
2019	131	信油杂817 Xinyouza 817	杂交系Hybrid line	0.1	28.69	43.10
2019	118	圣光185 Shengguang 185	杂交系Hybrid line	0	22.88	45.72
2019	116	陕油39 Shaanyou 39	杂交系Hybrid line	0	28.94	44.83
2019	86	华抗009R Huakang 009R	杂交系Hybrid line	0	21.39	44.45
2019	103	绵油60 Mianyou 60	杂交系Hybrid line	0.4	26.39	45.61
2019	145	越优577 Yueyou 577	杂交系Hybrid line	0.4	22.82	47.78
2019	94	华油杂718 Huayouza 718	杂交系Hybrid line	1.0	22.78	45.94
2019	72	赣油杂703 Ganyouza 703	杂交系Hybrid line	0.1	24.01	45.41
2019	82	花育1号 Huayu 1	杂交系Hybrid line	0.1	21.31	42.22
2019	53	川油杂2002 Chuanyouza 2002	杂交系Hybrid line	0.1	44.24	43.99

Table S2

Fig. 2

Table 1

Table 2

Fig. 3

Table 3

Fig. 4

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年份 Year	平均气温 Mean temperature (℃)	降水量 Precipitation (mm)	K指数 K index
2004	11.89	659.42	7.46
2005	12.23	683.40	8.21
2006	12.88	584.13	8.65
2007	11.87	496.06	4.51
2008	12.40	668.43	7.00
2009	11.77	767.78	6.10
2010	11.65	418.63	3.09
2011	11.86	724.57	8.36
2012	11.69	696.32	7.89
2013	12.39	616.04	4.49
2014	12.12	665.73	5.61
2015	12.04	812.41	7.85
2016	12.38	738.68	9.04
2017	11.82	599.74	5.32
2018	11.62	685.53	8.69
2019	12.82	630.76	9.74
2020	12.03	550.43	6.51
2021	12.29	696.99	6.50
2022	13.03	599.13	5.80
2023	12.42	759.34	8.67
平均值Average	12.20	652.70	7.00

性状 Trait	30°N以北 North of 30°N	30°N以南 South of 30°N	30°N以北地区较30°N以南地区增减 Increase or decrease of north of 30°N relative to south of 30°N (± %)
菌核病病情指数Index of Sclerotinia sclerotiorm	7.8^**	3.7	113.2
株高Plant height (cm)	190.0^**	176.6	7.6
分枝数Branching number	7.2^**	6.6	8.8
单株角果数Silique number per plant	275.1^**	255.1	7.8
每角粒数Seed number per silique	20.0	20.3	-1.3
千粒重Thousand seeds weight (g)	3.9	3.9	-0.8
单株产量Yield per plant (g)	18.9^**	13.6	38.4
全生育期Whole growth period (d)	222.8^**	214.7	3.8
硫甙Glucosinolate content (µmol g^-1)	23.5	23.6	-0.3
含油量Oil content (%)	44.3	44.4	-0.3
产量Yield (kg hm^-2)	3136.7^**	2357.6	33.0

月份 Month	平均气温Mean temperature (℃)		最高气温Max. temperature (℃)		最低气温Min. temperature (℃)
月份 Month	30°N以北 North of 30°N	30°N以南 South of 30°N	30°N以北 North of 30°N	30°N以南 South of 30°N	30°N以北 North of 30°N	30°N以南 South of 30°N
10月Oct.	0.057	0.204^**	0.155^**	0.407^**	0.174^**	0.092^*
11月Nov.	0.293^**	0.302^**	0.117^*	0.125^**	0.477^**	0.304^**
12月Dec.	0.081	-0.054	0.004	-0.007	0.294^**	0.392^**
1月Jan.	-0.173^**	-0.500^**	0.355^**	-0.355^**	0.201^**	-0.084^*
2月Feb.	0.311^**	0.326^**	-0.317^**	-0.171^**	0.361^**	0.274^**
3月Mar.	0.271^**	0.484^**	0.317^**	0.443^**	0.175^**	-0.013
4月Apr.	0.069	0.022	0.332^**	0.189^**	0.060	-0.046
月份 Month	气温日较差 Diurnal temperature range (℃)		降水量 Precipitation (mm)		日照时数 Sunshine duration (h)
月份 Month	30°N以北 North of 30°N	30°N以南 South of 30°N	30°N以北 North of 30°N	30°N以南 South of 30°N	30°N以北 North of 30°N	30°N以南 South of 30°N
10月Oct.	0.135^**	0.239^**	-0.248^**	-0.212^**	0.166^**	0.214^**
11月Nov.	0.134^**	0.191^**	-0.353^**	-0.423^**	0.008	0.209^**
12月Dec.	-0.090	-0.022	-0.457^**	-0.291^**	-0.025	-0.087^*
1月Jan.	0.032	-0.269^**	-0.042	0.263^**	-0.029	-0.003
2月Feb.	0.089	-0.270^**	-0.079	0.408^**	-0.121^*	-0.152^**
3月Mar.	0.184^**	0.207^**	-0.310^**	-0.367^**	-0.104^*	0.222^**
4月Apr.	0.397^**	0.024	-0.461^**	-0.390^**	0.306^**	0.237^**

地区 Region	交互作用因子 Interaction factor	相关系数 Correlation coefficient	直接通径系数 Direct path coefficient	间接通径系数Indirect path-coefficient
地区 Region	交互作用因子 Interaction factor	相关系数 Correlation coefficient	直接通径系数 Direct path coefficient	X₁	X₂	X₃	X₄	X₅	X₆	X₇	X₈	X₉	X₁₀
30°N以北	X₁	-0.29	-4.33	—	-1.87	2.55	-0.12	0.14	-3.21	-5.18	-5.23	-0.38	1.15
North of 30°N	X₂	0.30	7.51	1.08	—	-6.63	-0.38	1.67	-0.50	8.71	-3.95	0.05	4.21
	X₃	0.04	-36.43	0.30	1.37	—	-0.79	-2.53	-10.17	20.83	4.52	0.44	-3.53
	X₄	0.06	-1.17	-0.45	2.42	-24.50	—	-6.17	-6.45	25.87	3.21	0.23	-1.59
	X₅	0.19	26.37	-0.02	0.48	3.50	0.28	—	-3.23	-0.88	-3.11	0.41	1.87
	X₆	0.15	24.67	0.56	-0.15	15.02	0.31	-3.45	—	-3.15	5.58	-0.14	2.94
	X₇	0.26	33.95	0.66	1.93	-22.35	-0.89	-0.68	-2.29	—	5.21	0.87	-2.10
	X₈	0.24	25.13	0.90	-1.18	-6.55	-0.15	-3.27	5.47	7.04	—	0.53	-5.62
	X₉	-0.15	-5.20	-0.32	-0.07	3.08	0.05	-2.07	0.67	-5.65	-2.57	—	0.27
	X₁₀	0.06	14.49	-0.34	2.18	8.88	0.13	3.41	5.01	-4.92	-9.74	-0.10	—
30°N以南	X₁	0.01	-2.07	—	-0.16	24.90	-0.09	0.73	1.35	-4.17	0.11	-0.22	2.67
South of 30°N	X₂	0.45	6.70	0.05	—	-26.18	0.12	1.86	-0.92	13.35	-0.86	0.10	1.36
	X₃	0.10	-87.42	0.59	2.00	—	0.31	-0.16	-5.12	22.40	0.64	0.36	-3.86
	X₄	0.22	0.37	0.51	2.22	-72.65	—	-0.48	-6.19	23.81	0.98	0.39	-3.74
	X₅	0.27	8.84	-0.17	1.41	1.58	-0.02	—	-2.71	9.94	-1.42	0.16	2.80
	X₆	-0.14	19.24	-0.14	-0.32	23.25	-0.12	-1.24	—	-13.70	-0.98	-0.08	1.74
	X₇	0.48	34.57	0.25	2.59	-56.64	0.26	2.54	-7.62	—	1.46	0.42	-1.77
	X₈	0.12	5.36	-0.04	-1.07	-10.46	0.07	-2.34	-3.53	9.41	—	0	-2.50
	X₉	-0.11	-1.97	-0.23	-0.35	16.05	-0.07	-0.72	0.78	-7.40	-0.01	—	0.37
	X₁₀	0.13	10.82	-0.51	0.84	31.15	-0.13	2.29	3.09	-5.66	-1.24	-0.07	—

Region-specific yield optimization strategies for rapeseed (Brassica napus L.) in the middle Yangtze Basin across the 30°N latitude

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