Effects of reduced nitrogen application on yield and nitrogen agronomic efficiency of Yongyou indica-japonica hybrid rice

doi:10.3969/j.issn.1004-1524.2021.06.03

Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (6): 984-992.DOI: 10.3969/j.issn.1004-1524.2021.06.03

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Effects of reduced nitrogen application on yield and nitrogen agronomic efficiency of Yongyou indica-japonica hybrid rice

WANG Feng¹(), SHEN Jianghua¹, CHEN Ruoxia¹^,^*(), SHI Jun¹, REN Shaopeng¹, JIN Shuquan¹, YAO Hongyan¹, ZHU Defeng², DAI Yaolu¹

1. Institute of Eco-Environmental Sciences, Ningbo Academy of Agricultural Sciences, Ningbo 315040, China
2. China National Rice Research Institute, Hangzhou 310006, China

Received:2020-12-25 Online:2021-06-25 Published:2021-06-25
Contact: CHEN Ruoxia

Abstract

Abstract:

A field experiment was carried out in two sites (Xiangshan and Yinzhou),which represented different soil type of single-season rice area in east Zhejiang from 2017 to 2019, with four Yongyou indica-japonica hybrid rice cultivars (YY1540, YY7850, YY12 and YY538) and two conventional japonica rice cultivars (N84 and XS134) as materials. Four treatments were set with varying levels of N application rates: HN (N: 240 kg·hm^-2 for hybrid rice and 200 kg·hm^-2 for conventional rice); MN (N reduction of 17% compared with HN), LN (N reduction of 34% compared with HN), N0 (control without N). It was shown that the grain yield (GY) decreased with the reduction of nitrogen application rate in both sites. The yield of Yongyou hybrid rice under MN treatment in Xiangshan and Yinzhou was 10.8 t·hm^-2 and 9.9 t·hm^-2, respectively, which was only 1.2% and 2.6% lower than that under HN, with no significant difference. N reduction (MN and LN) decreased effective panicle (EP) in both sites, but increased seed setting rate (SSR) and 1 000-grain weight (GW) in Xiangshan. Correlation analysis showed that the GY of Yongyou indica-japonica hybrid rice was significantly (P<0.05) positively correlated with EP, number of spikelets per panicle (NSP) and maximum number of tillers and stems (MNTS) in Xiangshan, and was significantly (P<0.05) positively correlated with EP, SSR and panicle-bearing tiller rate (PBTR) in Yinzhou. N agronomic efficiency (NAE) of Yongyou indica-japonica hybrid rice was not significantly affected by N application rate, but increased rapidly with the trial age in Xiangshan, indicating that long-term reduction of N input without other technical assistance had a potential risk. For Yongyou indica-japonica hybrid rice under the conventional practice in the coastal region of east Zhejiang, nitrogen application rate could be reduced by 17% with no significant reduction of the grain yield. But, for the long-term run, comprehensive effects of soil fertility, rice varieties and fertilizer utilization should be well considered.

Key words: Yongyou indica-japonica hybrid rice, yield, nitrogen

CLC Number:

S143.1

WANG Feng, SHEN Jianghua, CHEN Ruoxia, SHI Jun, REN Shaopeng, JIN Shuquan, YAO Hongyan, ZHU Defeng, DAI Yaolu. Effects of reduced nitrogen application on yield and nitrogen agronomic efficiency of Yongyou indica-japonica hybrid rice[J]. Acta Agriculturae Zhejiangensis, 2021, 33(6): 984-992.

Figures/Tables 5

References 21

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地点 Site	pH	EC/(μS· cm^-1)	OM/(g· kg^-1)	TN/(g· kg^-1)	AN/(mg· kg^-1)	AP/(mg· kg^-1)	AK/(mg· kg^-1)	CEC/(cmol· kg^-1)
象山Xiangshan	5.91^**	463^**	29.2	2.33	205	12.9	204	27.9^**
鄞州Yinzhou	5.67	141	50.4^**	4.24^**	357^**	92.2^**	228	22.0

地点 Site	pH	EC/(μS· cm^-1)	OM/(g· kg^-1)	TN/(g· kg^-1)	AN/(mg· kg^-1)	AP/(mg· kg^-1)	AK/(mg· kg^-1)	CEC/(cmol· kg^-1)
象山Xiangshan	5.91^**	463^**	29.2	2.33	205	12.9	204	27.9^**
鄞州Yinzhou	5.67	141	50.4^**	4.24^**	357^**	92.2^**	228	22.0

地点 Site	水稻类别 Rice category	处理 Treatment	实测产量 Grain yield/ (t·hm^-2)	有效穗 Effective panicle number/(10⁴ hm^-2)	每穗粒数 Number of spikelets per panicle	结实率 Seed setting rate/%	千粒重 1 000-grain weight/g
象山	甬优杂交稻	HN	11.0 a	189 a	317 a	87.2 b	21.9 c
Xiangshan	Yongyou	MN	10.8 a	184 ab	313 a	88.4 ab	22.3 b
	hybrid rice	LN	10.5 a	179 b	303 a	90.2 ab	22.4 b
		CK	9.1 b	157 c	285 b	91.9 a	22.9 a
	常规粳稻	HN	8.5 a	277 a	147 a	84.1 a	26.3 c
	Conventional	MN	8.4 a	266 ab	149 a	85.5 a	26.5 bc
	japonica rice	LN	8.0 a	255 b	146 a	85.5 a	26.8 b
		CK	6.9 b	227 c	132 b	89.4 a	27.6 a
鄞州	甬优杂交稻	HN	10.1 a	212 a	309 ab	74.6 b	22.6 a
Yinzhou	Yongyou	MN	9.9 a	205 a	306 ab	74.5 b	22.7 a
	hybrid rice	LN	9.4 b	196 b	301 b	75.5 b	22.5 a
		CK	8.7 c	159 c	313 a	80.4 a	22.7 a
	常规粳稻	HN	8.6 a	256 a	154 a	85.0 a	26.2 a
	Conventional	MN	8.3 a	246 a	150 a	86.5 a	26.6 a
	japonica rice	LN	7.6 ab	221 b	154 a	85.1 a	26.6 a
		CK	6.7 b	198 c	159 a	84.8 a	26.5 a

地点 Site	水稻类别 Rice category	处理 Treatment	实测产量 Grain yield/ (t·hm^-2)	有效穗 Effective panicle number/(10⁴ hm^-2)	每穗粒数 Number of spikelets per panicle	结实率 Seed setting rate/%	千粒重 1 000-grain weight/g
象山	甬优杂交稻	HN	11.0 a	189 a	317 a	87.2 b	21.9 c
Xiangshan	Yongyou	MN	10.8 a	184 ab	313 a	88.4 ab	22.3 b
	hybrid rice	LN	10.5 a	179 b	303 a	90.2 ab	22.4 b
		CK	9.1 b	157 c	285 b	91.9 a	22.9 a
	常规粳稻	HN	8.5 a	277 a	147 a	84.1 a	26.3 c
	Conventional	MN	8.4 a	266 ab	149 a	85.5 a	26.5 bc
	japonica rice	LN	8.0 a	255 b	146 a	85.5 a	26.8 b
		CK	6.9 b	227 c	132 b	89.4 a	27.6 a
鄞州	甬优杂交稻	HN	10.1 a	212 a	309 ab	74.6 b	22.6 a
Yinzhou	Yongyou	MN	9.9 a	205 a	306 ab	74.5 b	22.7 a
	hybrid rice	LN	9.4 b	196 b	301 b	75.5 b	22.5 a
		CK	8.7 c	159 c	313 a	80.4 a	22.7 a
	常规粳稻	HN	8.6 a	256 a	154 a	85.0 a	26.2 a
	Conventional	MN	8.3 a	246 a	150 a	86.5 a	26.6 a
	japonica rice	LN	7.6 ab	221 b	154 a	85.1 a	26.6 a
		CK	6.7 b	198 c	159 a	84.8 a	26.5 a

水稻类别 Rice category	指标 Index	GY	EP	NSP	SSR	GW	MNTS	PBTR
甬优杂交稻	GY	—	0.790^**	-0.087	0.674^**	-0.813^**	-0.612^**	0.812^**
Yongyou hybrid rice	EP	0.581^**	—	-0.466^*	0.492^*	-0.784^**	-0.221	0.510^*
	NSP	0.437^**	-0.160	—	-0.470^*	0.091	0.167	-0.160
	SSR	-0.069	-0.036	-0.735^**	—	-0.584^**	-0.875^**	0.813^**
	GW	-0.425^**	-0.490^**	-0.501^**	0.554^**	—	0.446^*	-0.671^**
	MNTS	0.353^*	0.479^**	0.379^**	-0.556^**	-0.580^**	—	-0.912^**
	PBTR	-0.160	-0.065	-0.470^**	0.521^**	0.377^**	-0.884^**	—
常规粳稻	GY	—	0.524^**	-0.400	0.287	0.013	0.185	0.245
Conventional	EP	0.138	—	-0.782^**	-0.380	0.052	0.561^**	0.393
japonica rice	NSP	-0.196	0.087	—	-0.080	0.199	-0.011	-0.191
	SSR	0.360^*	-0.767^**	-0.526^**	—	-0.519^**	-0.765^**	-0.219
	GW	0.289^*	-0.274	-0.099	0.323^*	—	0.398	0.242
	MNTS	-0.001	0.783^**	0.067	-0.611^**	-0.314^*	—	0.134
	PBTR	0.244	0.402^**	0.039	-0.292^*	0.048	-0.247	—

Effects of reduced nitrogen application on yield and nitrogen agronomic efficiency of Yongyou indica-japonica hybrid rice

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