长江中下游地区常规中熟粳稻氮效率综合评价及高产氮高效品种筛选

doi:10.3864/j.issn.0578-1752.2021.07.007

Abstract

Abstract:

【Objective】The main purpose of this study was to screen out the inbred japonica rice varieties with high grain yield and high nitrogen efficiency in the middle and lower reaches of Yangtze River, so as to provide a reference for the breeding and production application of high grain yield and high nitrogen efficiency varieties in this area.【Method】105 inbred japonica rice varieties (90 in 2017, 105 in 2018) from the middle and lower reaches of Yangtze River were used as experimental materials, and grain yield, dry matter accumulation, nitrogen uptake and utilization efficiency were determined at maturity stage under the treatment of nitrogen and no nitrogen. Nitrogen recovery efficiency, nitrogen agronomic efficiency, nitrogen physiological efficiency, nitrogen grain yield production efficiency and nitrogen dry matter production efficiency were used as the evaluation indexes of nitrogen absorption and utilization efficiency, and the comprehensive evaluation value of nitrogen efficiency (CEV) of each variety (line) was obtained by using the entropy weight fuzzy synthetic evaluation method. Then, the grain yield-nitrogen efficiency index (GYNEI) was calculated by using CEV and grain yield. According to the GYNEI, the varieties (lines) were classified by the method of cluster analysis.【Result】The tested varieties (lines) were divided into three types, and the average values of grain yield, nitrogen recovery efficiency, nitrogen agronomic efficiency, nitrogen physiological efficiency, nitrogen grain yield production efficiency, nitrogen dry matter production efficiency in Type Ⅰ were highest, while those in Type Ⅲ were lowest. Therefore, Type Ⅰ varieties (lines) were characterized by high grain yield and high nitrogen efficiency, and Type Ⅲ varieties (lines) were characterized by low grain yield and low nitrogen efficiency. According to the screening results, 23 and 27 varieties (lines) were divided into high grain yield and high nitrogen efficiency type in 2017 and 2018, respectively, and 19 varieties (lines), such as Nanjing9108, Nanjing5718, Ningjing7, Sidao15, Yangjing239 and so on, were classified into high grain yield and high nitrogen efficiency type in two years. In addition, stem dry matter weight, leaf dry matter weight, panicle dry matter weight, total dry matter weight, spikelet per panicle, grain yield, panicle nitrogen uptake, total nitrogen uptake of high grain yield and high nitrogen efficiency type (TypeⅠ) were significantly higher than those of Type Ⅱ and Type Ⅲ.【Conclusion】 19 varieties (lines) were preliminarily identified as high grain yield and high nitrogen efficiency varieties (lines), such as Nanjing 9108, Nanjing 5718, Ningjing7, Sidao15, and so on. Compared with the low grain yield and low nitrogen efficiency varieties (lines), the high grain yield and high nitrogen efficiency varieties (lines) showed the characteristics of larger biomass, more spikelet per panicle, higher nitrogen uptake, especially higher panicle nitrogen uptake. These results could provide a reference for the selection of inbred middle-ripe japonica rice varieties in the middle and lower reaches of Yangtze River, and also provided materials for the study of the synergistic mechanism of grain yield and nitrogen efficiency.

Key words: grain yield, the Middle and Lower Reaches of Yangtze River, nitrogen efficiency, comprehensive evaluation, japonica

LIU QiuYuan,ZHOU Lei,TIAN JinYu,CHENG Shuang,TAO Yu,XING ZhiPeng,LIU GuoDong,WEI HaiYan,ZHANG HongCheng. Comprehensive Evaluation of Nitrogen Efficiency and Screening of Varieties with High Grain Yield and High Nitrogen Efficiency of Inbred Middle-Ripe Japonica Rice in the Middle and Lower Reaches of Yangtze River[J].Scientia Agricultura Sinica, 2021, 54(7): 1397-1409.

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URL: https://www.chinaagrisci.com/EN/10.3864/j.issn.0578-1752.2021.07.007

https://www.chinaagrisci.com/EN/Y2021/V54/I7/1397

Figures/Tables 8

Table 1

List of tested varieties (lines)"

年度 Year

品种（系）Variety (line)

2017

JD6602、JD6614、JD6619、常软07-1 Changruan07-1、常软07-11 Changruan07-11、常软07-2 Changruan07-2、常软07-3 Changruan07-3、常软07-4 Changruan07-4、常软07-5 Changruan07-5、常软07-6 Changruan07-6、丰粳1606 Fengjing1606、沪香粳165 Huxiangjing165、沪早软粳 Huzaoruanjing、沪早香软1号 Huzaoxiangruan1、沪早香软2号 Huzaoxiangruan2、华丰1502 Huafeng1502、华粳295 Huajing295、华粳5号 Huajing5、华粳8号 Huajing8、淮330 Huai330、淮稻5号 Huaidao5、连粳11号 Lianjing11、连粳12号 Lianjing12、连粳13 Lianjing13、连粳13264 Lianjing13264、连粳15 Lianjing15、连粳15113 Lianjing15113、连粳7号 Lianjing7、南繁1604 Nanfan1604、南繁1605 Nanfan1605、南繁1609 Nanfan1609、南繁1610 Nanfan1610、南粳2728 Nanjing2728、南粳505 Nanjing505、南粳5711 Nanjing5711、南粳5833 Nanjing5833、南粳9108 Nanjing9108、南粳3818 Nanjing3818、南粳5718 Nanjing5718、宁5720 Ning5720、宁9003 Ning9003、宁9022 Ning9022、宁9039 Ning9039、宁粳040 Ningjing040、宁粳4号Ningjing4、宁粳7号Ningjing7、圣稻1647 Shendao1647、圣稻18-15 Shendao18-15、圣稻18-4 Shendao18-4、圣稻19 Shendao19、圣稻20 Shendao20、圣稻22 Shendao22、圣稻2620 Shendao2620、泗15-234 Si15-234、泗15-301 Si15-301、泗稻14-211 Sidao14-211、泗稻15号 Sidao15、松早香1号 Songzaoxiang1、苏1795 Su1795、苏粳815 Sujing815、苏香粳3号 Suxiangjing3、苏秀867 Suxiu867、泰粳1152 Taijing1152、泰粳2340 Taijing2340、皖垦粳3号 Wankenjing3、武4610 Wu4610、武6267 Wu6267、武粳004 Wujing004、武育粳3号 Wuyujing3、武运5020 Wuyun5020、武运5051 Wuyun5051、武运粳21 Wuyunjing21、武运粳27号 Wuyunjing27、武运粳32号 Wuyunjing32、武运粳80 Wuyunjing80、新稻22 Xindao22、新科稻31 Xinkedao31、徐36618 Xu36618、徐41368 Xu41368、徐稻9号 Xudao9、徐农33202 Xunong33202、盐粳16号Yanjing16、扬粳1612 Yangjing1612、扬粳239 Yangjing239、扬粳3012 Yangjing3012、扬粳3491 Yangjing3491、扬粳5515 Yangjing5515、扬育粳2号Yangyujing2、镇9471 Zhendao9471、镇稻99 Zhendao99

2018
（新增 Newly added）

早香粳1号 Zaoxiangjing1、福粳1601 Fujing1601、福粳1608 Fujing1608、沪早香181 Huzaoxiang181、宁9036 Ning9036、申粳1221 Shenjing1221、圣稻18 Shendao18、圣稻23 Shendao23、圣稻24 Shendao24、圣香66 Shenxiang66、苏1785 Su1785、武育粳36号Wuyujing36、武运4326 Wuyun4326、徐40398 Xu40398、徐稻10号 Xudao10

Table 1

Table 2

Grain yield, dry matter production, nitrogen uptake and utilization efficiency of tested varieties (lines)"

年份 Year	指标 Trait	N18			N0
年份 Year	指标 Trait	变幅 Range	平均值 Mean	变异系数 CV (%)	变幅 Range	平均值 Mean	变异系数 CV (%)
2017	有效穗数 Number of effective panicles (×10⁴ hm^-2)	302.58-467.52	365.20	8.16	230.10-426.90	303.97	9.31
	千粒重 1000-grain weight (g)	20.60-29.88	26.38	5.87	20.93-30.25	26.88	5.75
	穗粒数 Spikelet per panicle	75.38-136.08	103.21	10.48	63.88-114.3	94.47	10.05
	结实率 Percentage of filled grains (%)	82.43-95.77	89.43	3.39	79.34-98.43	92.37	4.27
	产量 Grain yield (t·hm^-2)	6.80-9.89	8.42	8.11	5.25-7.76	6.69	6.91
	茎干重 SDM (t·hm^-2)	4.62-7.44	6.01	9.29	3.36-5.30	4.36	7.82
	叶干重 LDM (t·hm^-2)	2.24-4.37	3.28	12.34	1.66-2.99	2.39	10.72
	穗干重 PDM (t·hm^-2)	6.94-10.99	9.00	8.93	5.41-8.36	7.13	7.38
	总干重 TDM (t·hm^-2)	14.56-21.25	18.29	7.89	10.75-15.89	13.89	6.65
	茎吸氮量 SNC (kg·hm^-2)	43.92-84.95	61.50	12.71	20.28-37.56	25.29	11.40
	叶吸氮量 LNC (kg·hm^-2)	36.62-70.98	52.00	12.57	21.60-41.75	31.84	13.11
	穗吸氮量 PNC (kg·hm^-2)	89.19-149.51	121.92	8.60	61.64-98.58	83.74	8.73
	总吸氮量 TNC (kg·hm^-2)	194.77-270.38	235.42	6.50	117.17-165.88	140.87	7.53
	氮肥回收效率 NRE (%)	24.55-47.83	35.02	13.73	—	—	—
	氮肥农学利用率 NAE (kg·kg^-1)	1.70-13.58	6.39	35.17	—	—	—
	氮素生理利用率 NPE (kg·kg^-1)	6.38-32.16	17.92	25.81	—	—	—
	氮素籽粒生产效率 GYE (kg·kg^-1)	31.52-39.38	35.75	3.97	—	—	—
	氮素干物质生产效率 DME (kg·kg^-1)	69.24-83.74	77.66	3.54	—	—	—
2018	有效穗数 Number of effective panicles (×10⁴ hm^-2)	268.51-456.36	350.82	8.58	239.04-403.73	288.24	8.80
	千粒重 1000-grain weight (g)	20.78-30.17	26.62	6.57	22.05-30.88	27.86	6.19
	穗粒数 Spikelet per panicle	74.19-134.88	103.31	11.08	67.22-119.13	91.33	9.85
	结实率 Percentage of filled grains (%)	86.84-98.56	94.60	2.62	91.69-98.57	96.42	1.59
	产量 Grain yield (t·hm^-2)	6.82-10.28	8.58	8.49	5.04-8.01	6.60	8.03
	茎干重 SDM (t·hm^-2)	4.78-7.09	5.99	8.34	3.39-5.46	4.32	8.95
	叶干重 LDM (t·hm^-2)	2.15-3.83	3.05	11.43	1.45-2.43	1.98	11.08
	穗干重 PDM (t·hm^-2)	7.20-11.63	9.21	9.72	5.08-8.70	7.06	8.62
	总干重 TDM (t·hm^-2)	14.77-21.23	18.25	7.94	10.84-15.93	13.36	7.40
	茎吸氮量 SNC (kg·hm^-2)	37.94-73.85	55.97	11.60	15.61-30.53	21.67	13.71
	叶吸氮量 LNC (kg·hm^-2)	25.96-58.01	42.33	13.61	14.79-28.33	21.09	15.84
	穗吸氮量 PNC (kg·hm^-2)	89.37-144.78	117.32	9.73	61.02-95.06	78.76	8.27
	总吸氮量 TNC (kg·hm^-2)	175.72-246.13	215.63	6.80	100.01-146.65	121.51	7.32
	氮肥回收效率 NRE (%)	21.06-45.79	34.86	15.17	—	—	—
	氮肥农学利用率 NAE (kg·kg^-1)	2.27-13.97	7.33	32.29	—	—	—
	氮素生理利用率 NPE (kg·kg^-1)	10.76-30.96	20.65	22.31	—	—	—
	氮素籽粒生产效率 GYE (kg·kg^-1)	36.28-44.26	39.77	4.27	—	—	—
	氮素干物质生产效率 DME (kg·kg^-1)	77.15-91.93	84.59	3.60	—	—	—

Table 2

Table 3

Table 4

Table 5

Grain yield and nitrogen efficiency types of tested varieties (lines)"

品种（系） Variety (line)	产量-氮效率类型 GYNET		品种（系） Variety (line)	产量-氮效率类型 GYNET		品种（系） Variety (line)	产量-氮效率类型 GYNET
品种（系） Variety (line)	2017	2018	品种（系） Variety (line)	2017	2018	品种（系） Variety (line)	2017	2018
常软07-3 Changruan07-3	Ⅰ	Ⅰ	连粳13264 Lianjing13264	Ⅱ	Ⅲ	沪早软粳Huzaoruanjing	Ⅲ	Ⅱ
华丰1502 Huafeng1502	Ⅰ	Ⅱ	连粳15113 Lianjing15113	Ⅱ	Ⅱ	沪早香软1号Huzaoxiangruan1	Ⅲ	Ⅲ
华粳8号Huajing8	Ⅰ	Ⅰ	南繁1610 Nanfan1610	Ⅱ	Ⅲ	华粳295 Huajing295	Ⅲ	Ⅲ
南繁1605 Nanfan1605	Ⅰ	Ⅰ	南粳505 Nanjing505	Ⅱ	Ⅲ	华粳5号Huajing5	Ⅲ	Ⅲ
南粳5711 Nanjing5711	Ⅰ	Ⅰ	南粳5833 Nanjing5833	Ⅱ	Ⅱ	连粳15 Lianjing15	Ⅲ	Ⅲ
南粳9108 Nanjing9108	Ⅰ	Ⅰ	南粳3818 Nanjing3818	Ⅱ	Ⅱ	连粳7号 Lianjing7	Ⅲ	Ⅲ
南粳5718 Nanjing5718	Ⅰ	Ⅰ	宁5720 Ning5720	Ⅱ	Ⅲ	南繁1604 Nanfan1604	Ⅲ	Ⅲ
宁粳040 Ningjing040	Ⅰ	Ⅰ	宁9003 Ning9003	Ⅱ	Ⅱ	南繁1609 Nanfan1609	Ⅲ	Ⅲ
宁粳4号Ningjing4	Ⅰ	Ⅰ	宁9022 Ning9022	Ⅱ	Ⅱ	南粳2728 Nanjing2728	Ⅲ	Ⅲ
宁粳7号Ningjing7	Ⅰ	Ⅰ	宁9039 Ning9039	Ⅱ	Ⅰ	圣稻18-4 Shendao18-4	Ⅲ	Ⅲ
泗稻15号Sidao15	Ⅰ	Ⅰ	圣稻1647 Shendao1647	Ⅱ	Ⅱ	圣稻2620 Shendao2620	Ⅲ	Ⅲ
苏1795 Su1795	Ⅰ	Ⅰ	圣稻18-15 Shendao18-15	Ⅱ	Ⅱ	泗稻14-211 Sidao14-211	Ⅲ	Ⅲ
泰粳1152 Taijing1152	Ⅰ	Ⅰ	圣稻19 Shendao19	Ⅱ	Ⅱ	苏粳815 Sujing815	Ⅲ	Ⅲ
泰粳2340 Taijing2340	Ⅰ	Ⅰ	圣稻20 Shendao20	Ⅱ	Ⅱ	苏香粳3号 Suxiangjing3	Ⅲ	Ⅲ
武粳004 Wujing004	Ⅰ	Ⅱ	圣稻22 Shendao22	Ⅱ	Ⅱ	苏秀867 Suxiu867	Ⅲ	Ⅲ
武运5020 Wuyun5020	Ⅰ	Ⅰ	泗15-234 Si15-234	Ⅱ	Ⅲ	武育粳3号 Wuyujing3	Ⅲ	Ⅲ
武运5051 Wuyun5051	Ⅰ	Ⅱ	泗15-301 Si15-301	Ⅱ	Ⅱ	武运粳27号 Wuyunjing27	Ⅲ	Ⅲ
徐36618 Xu36618	Ⅰ	Ⅱ	松早香1号 Songzaoxiang1	Ⅱ	Ⅲ	新稻22 Xindao22	Ⅲ	Ⅲ
徐41368 Xu41368	Ⅰ	Ⅰ	皖垦粳3号 Wankenjing3	Ⅱ	Ⅱ	新科稻31 Xinkedao31	Ⅲ	Ⅲ
扬粳1612 Yangjing1612	Ⅰ	Ⅰ	武4610 Wu4610	Ⅱ	Ⅱ	徐稻9号Xudao9	Ⅲ	Ⅲ
扬粳239 Yangjing239	Ⅰ	Ⅰ	武6267 Wu6267	Ⅱ	Ⅱ	福粳1601 Fujing1601	—	Ⅱ
扬粳3491 Yangjing3491	Ⅰ	Ⅰ	武运粳21 Wuyunjing21	Ⅱ	Ⅲ	福粳1608 Fujing1608	—	Ⅱ
扬粳5515 Yangjing5515	Ⅰ	Ⅰ	武运粳32号 Wuyunjing32	Ⅱ	Ⅱ	沪早香181 Huzaoxiang181	—	Ⅱ
JD6602	Ⅱ	Ⅱ	武运粳80 Wuyunjing80	Ⅱ	Ⅰ	宁9036 Ning9036	—	Ⅲ
常软07-1 Changruan07-1	Ⅱ	Ⅰ	徐农33202 Xunong33202	Ⅱ	Ⅲ	申粳1221 Shenjing1221	—	Ⅲ
常软07-2 Changruan07-2	Ⅱ	Ⅱ	盐粳16号 Yanjing16	Ⅱ	Ⅲ	圣稻18 Shendao18	—	Ⅲ
常软07-4 Changruan07-4	Ⅱ	Ⅲ	扬粳3012 Yangjing3012	Ⅱ	Ⅱ	圣稻23 Shendao23	—	Ⅰ
常软07-6 Changruan07-6	Ⅱ	Ⅰ	扬育粳2号 Yangyujing2	Ⅱ	Ⅱ	圣稻24 Shendao24	—	Ⅲ
丰粳1606 Fengjing1606	Ⅱ	Ⅱ	镇9471 Zhendao9471	Ⅱ	Ⅱ	圣香66 Shenxiang66	—	Ⅱ
沪早香软2号 Huzaoxiangruan2	Ⅱ	Ⅱ	镇稻99 Zhendao99	Ⅱ	Ⅲ	苏1785 Su1785	—	Ⅰ
淮330 Huai330	Ⅱ	Ⅱ	JD6614	Ⅲ	Ⅲ	武育粳36号 Wuyujin36	—	Ⅲ
淮稻5号 Huaidao5	Ⅱ	Ⅱ	JD6619	Ⅲ	Ⅲ	武运4326 Wuyun4326	—	Ⅰ
连粳11号 Lianjing11	Ⅱ	Ⅱ	常软07-11 Changruan07-11	Ⅲ	Ⅲ	徐40398 Xu40398	—	Ⅱ
连粳12号 Lianjing12	Ⅱ	Ⅲ	常软07-5 Changruan07-5	Ⅲ	Ⅲ	徐稻10号Xudao10	—	Ⅰ
连粳13 Lianjing13	Ⅱ	Ⅲ	沪香粳165 Huxiangjing165	Ⅲ	Ⅲ	早香粳1号 Zaoxiangjing1	—	Ⅲ

Table 5

Table 6

Table 7

Table 8

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年份 Year	氮肥回收效率 NRE	氮肥农学利用率 NAE	氮素生理利用率 NPE	氮素籽粒生产效率 GYE	氮素干物质生产效率 DME
2017	0.247	0.219	0.186	0.169	0.178
2018	0.186	0.192	0.230	0.211	0.182

指标 Trait	年份 Year	变幅 Range	变异系数 CV (%)	平均值 Mean
氮效率综合值CEV	2017	0.485-0.952	12.28	0.707
氮效率综合值CEV	2018	0.535-0.977	11.63	0.752
产量-氮效率综合指数GYNEI	2017	0.569-1.583	19.45	1.008
产量-氮效率综合指数GYNEI	2018	0.628-1.541	18.80	1.007

年份 Year	产量-氮效率类型GYNET	指标 Trait	产量-氮效率综合指数 GYNEI	产量 Grain yield (t·hm^-2)	氮肥回收效率 NRE (%)	氮肥农学利用率 NAE (kg·kg^-1)	氮素生理利用率 NPE (kg·kg^-1)	氮素籽粒生产效率GYE (kg·kg^-1)	氮素干物质生产效率 DME (kg·kg^-1)
2017	Ⅰ	变幅 Range	1.142-1.583	8.51-9.89	30.65-47.83	7.41-13.58	18.53-32.16	35.40-39.38	76.91-83.74
		变异系数 CV (%)	9.36	3.88	10.46	18.56	13.46	2.91	2.59
		平均值 Mean	1.271a	9.27a	39.18a	9.15a	23.33a	37.19a	79.97a
	Ⅱ	变幅Range	0.882-1.107	7.41-9.16	26.90-42.48	4.37-8.52	12.60-24.42	33.75-37.56	72.97-81.41
		变异系数 CV (%)	7.09	4.22	9.88	17.95	15.01	2.70	2.55
		平均值 Mean	0.993b	8.38b	35.51b	6.30b	17.74b	35.47b	77.32b
	Ⅲ	变幅 Range	0.569-0.867	6.80-8.32	24.55-36.85	1.70-5.27	6.38-17.72	31.52-36.93	69.24-81.52
		变异系数 CV (%)	8.84	5.25	10.21	21.01	20.59	3.97	4.08
		平均值 Mean	0.791c	7.70c	30.36c	4.01c	13.25c	34.88b	76.10b
2018	Ⅰ	变幅 Range	1.156-1.541	8.90-10.28	30.10-45.79	7.71-13.97	19.83-30.96	39.43-44.26	83.75-91.58
		变异系数 CV (%)	7.16	3.59	9.78	16.09	11.49	2.47	1.81
		平均值 Mean	1.256a	9.50a	39.45a	9.95a	25.20a	41.30a	87.02a
	Ⅱ	变幅 Range	0.940-1.130	7.47-9.51	26.92-41.97	5.76-10.12	15.83-26.32	36.28-42.81	79.93-88.64
		变异系数 CV (%)	5.54	4.19	9.96	13.69	11.54	3.57	2.89
		平均值 Mean	1.042b	8.65b	36.51b	8.02b	22.02b	39.69b	84.35b
	Ⅲ	变幅 Range	0.628-0.924	6.82-8.71	21.06-35.58	2.27-7.31	10.76-22.47	36.53-43.13	77.15-91.93
		变异系数 CV (%)	9.12	5.16	12.71	24.33	19.98	4.09	3.98
		平均值 Mean	0.823c	7.94c	30.62c	5.13c	16.68c	38.87b	83.27b

年份 Year	产量-氮效率类型 GYNET	指标 Trait	有效穗数 Number of effective panicles (×10⁴ hm^-2)	千粒重 1000-grain weight (g)	穗粒数 Spikelet per panicle	结实率 Percentage of filled grains (%)
2017	Ⅰ	变幅 Range	313.50-410.25	24.15-29.88	94.55-136.08	83.55-93.44
		变异系数 CV (%)	7.21	5.63	8.85	3.21
		平均值 Mean	363.20a	26.81a	111.18a	88.77a
	Ⅱ	变幅 Range	317.34-429.58	24.00-29.13	83.32-128.31	82.43-95.61
		变异系数 CV (%)	6.61	5.01	9.48	3.25
		平均值 Mean	369.49a	26.46a	102.36b	88.99a
	Ⅲ	变幅 Range	302.58-467.52	20.60-29.38	75.38-112.30	84.52-95.77
		变异系数 CV (%)	11.03	7.04	9.54	3.43
		平均值 Mean	359.82a	25.86a	97.31c	90.80a
2018	Ⅰ	变幅 Range	286.46-386.83	24.15-30.17	95.95-134.88	88.93-97.03
		变异系数 CV (%)	7.84	5.91	8.99	2.43
		平均值 Mean	347.67a	27.09a	112.31a	94.31a
	Ⅱ	变幅 Range	308.83-425.53	23.98-30.06	90.77-119.47	90.22-97.92
		变异系数 CV (%)	7.46	6.83	8.42	2.48
		平均值 Mean	350.85a	26.69a	103.94b	94.42a
	Ⅲ	变幅 Range	268.51-456.36	20.78-29.65	74.19-126.02	86.84-98.56
		变异系数 CV (%)	9.88	6.61	10.70	2.85
		平均值 Mean	352.78a	26.26a	97.14c	94.93a

年份 Year	产量-氮效率类型 GYNET	指标 Trait	茎干重 SDM (t·hm^-2)	叶干重 LDM (t·hm^-2)	穗干重 PDM (t·hm^-2)	总干重 TDM (t·hm^-2)	茎吸氮量 SNC (kg·hm^-2)	叶吸氮量 LNC (kg·hm^-2)	穗吸氮量 PNC (kg·hm^-2)	总吸氮量 TNC (kg·hm^-2)
2017	Ⅰ	变幅 Range	5.63-7.44	2.96-4.37	8.68-10.99	18.56-21.25	52.45-84.95	43.89-67.41	113.42-149.51	227.38-270.38
		变异系数 CV (%)	7.33	9.14	6.01	3.98	12.20	11.69	7.38	4.72
		平均值 Mean	6.44a	3.54a	9.95a	19.93a	64.35a	53.48a	131.60a	249.42a
	Ⅱ	变幅 Range	4.79-6.97	2.49-4.14	7.35-9.76	15.28-20.11	49.90-76.20	36.62-67.06	99.58-135.63	207.82-253.72
		变异系数 CV (%)	7.41	10.16	5.54	4.72	11.22	12.47	5.97	4.44
		平均值 Mean	6.06b	3.32b	8.90b	18.27b	63.44a	52.04a	120.88b	236.37b
	Ⅲ	变幅 Range	4.62-6.28	2.24-3.89	6.93-9.02	14.56-18.31	43.92-66.82	38.06-70.98	89.19-129.54	194.77-242.98
		变异系数 CV (%)	7.93	13.00	6.08	5.94	10.31	13.48	8.14	5.44
		平均值 Mean	5.54c	2.97c	8.30c	16.80c	55.60b	50.58a	114.75c	220.93c
2018	Ⅰ	变幅 Range	5.61-7.11	3.02-3.83	9.29-11.63	18.63-21.23	46.63-68.80	37.03-55.14	108.10-144.78	208.18-246.13
		变异系数 CV (%)	5.78	6.15	5.16	3.18	9.65	8.92	7.37	3.79
		平均值 Mean	6.37a	3.33a	10.32a	20.02a	57.48 a	44.64 a	128.00 a	230.12 a
	Ⅱ	变幅 Range	5.16-6.94	2.42-3.83	7.78-10.08	16.54-20.12	44.90-73.85	35.27-58.01	99.49-133.55	193.36-239.16
		变异系数 CV (%)	7.68	11.09	5.16	4.49	11.62	15.57	7.68	4.93
		平均值 Mean	6.03 b	3.10 b	9.25 b	18.39 b	57.20 a	43.44 a	117.48 b	218.11 b
	Ⅲ	变幅 Range	4.78-6.64	2.15-3.30	7.20-9.73	14.77-18.50	37.95-66.34	25.96-49.08	89.37-125.45	175.72-220.35
		变异系数 CV (%)	7.67	9.89	6.44	5.30	12.13	12.56	8.14	5.46
		平均值 Mean	5.70 c	2.83 c	8.48 c	17.01 c	54.03 a	39.97 b	110.49 c	204.50 c

Comprehensive Evaluation of Nitrogen Efficiency and Screening of Varieties with High Grain Yield and High Nitrogen Efficiency of Inbred Middle-Ripe Japonica Rice in the Middle and Lower Reaches of Yangtze River

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