Effects of one-time reduced basal application of urea on yield and nitrogen use efficiency of indica⁃japonica hybrid rice

doi:10.16178/j.issn.0528-9017.20250022

Abstract

Abstract:

This study aims to explore the effects of one-time basal combined application of resin-coated controlled-release urea and conventional urea on yield and nitrogen use efficiency of indica-japonica hybrid rice. Using Xiuyou 6（Jiashan）and Yongyou 1540（Fuyang）as test materials，three nitrogen treatments were set up：0N，no nitrogen fertilizer was applied throughout the growth period，only phosphorus and potassium were applied；LFP（control），representing the conventional fertilization practice of local farmers，where conventional urea was used as the nitrogen source with a nitrogen application of 200 kg·hm^-2 pure nitrogen；PCU，where resin-coated controlled-release urea and conventional urea were used as the nitrogen source with a nitrogen application rate reduced by 20% compared with LFP（equivalent to 160 kg·hm^-2 of pure nitrogen），and applied as a one-time basal mixed application. The results showed that there was no significant difference in yield between the two indica-japonica hybrid rice treated with PCU and LFP treatment at the two test sites. However，the PCU treatment significantly（p<0.05）improved agronomic nitrogen use efficiency，partial factor productivity of nitrogen fertilizer，yield utilization efficiency of nitrogen fertilizer，and nitrogen harvest index，while reducing two rounds of topdressing. Compared with LFP，PCU treatment significantly reduced the effective panicle number during rice maturity，while there was no significant difference in the number of grains per spike，but the seed setting rate and 1 000 grain weight were significantly increased. In conclusion，compared with the conventional fertilization practice of local farmers，a one-time basal combined application of resin-coated controlled-release urea and conventional urea offers stable yields，labor savings，and increased efficiency，demonstrating potential for wider adoption.

Key words: rice, resin-coated controlled-release urea, conventional urea, yield, nitrogen use efficiency

CLC Number:

S511

LU Xuefeng, XU Wei, CHEN Lin, YING Xiao, CHU Guang. Effects of one-time reduced basal application of urea on yield and nitrogen use efficiency of indica⁃japonica hybrid rice[J]. Journal of Zhejiang Agricultural Sciences, 2026, 67(2): 281-287.

Figures/Tables 8

References 18

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地点	处理	分蘖数/m^-2			分蘖成穗率/%
地点	处理	拔节期	齐穗期	成熟期	分蘖成穗率/%
嘉善	0N	193 c	142 c	140 c	72.5 a
	LFP	339 a	194 a	189 a	55.8 c
	PCU	279 b	180 b	175 b	62.7 b
富阳	0N	197 c	144 c	139 c	70.7 a
	LFP	360 a	208 a	205 a	56.9 c
	PCU	308 b	190 b	187 b	60.8 b

地点	处理	分蘖数/m^-2			分蘖成穗率/%
地点	处理	拔节期	齐穗期	成熟期	分蘖成穗率/%
嘉善	0N	193 c	142 c	140 c	72.5 a
	LFP	339 a	194 a	189 a	55.8 c
	PCU	279 b	180 b	175 b	62.7 b
富阳	0N	197 c	144 c	139 c	70.7 a
	LFP	360 a	208 a	205 a	56.9 c
	PCU	308 b	190 b	187 b	60.8 b

地点	处理	拔节期	齐穗期	成熟期
嘉善	0N	1.98 c	4.55 b	1.15 c
	LFP	4.82 a	6.95 a	1.55 b
	PCU	4.25 b	7.12 a	1.93 a
富阳	0N	1.79 c	4.29 b	0.98 c
	LFP	4.38 a	6.87 a	1.45 b
	PCU	4.05 b	6.97 a	1.88 a

地点	处理	拔节期	齐穗期	成熟期
嘉善	0N	1.98 c	4.55 b	1.15 c
	LFP	4.82 a	6.95 a	1.55 b
	PCU	4.25 b	7.12 a	1.93 a
富阳	0N	1.79 c	4.29 b	0.98 c
	LFP	4.38 a	6.87 a	1.45 b
	PCU	4.05 b	6.97 a	1.88 a

地点	处理	根氧化力/（μg·g^-1·h^-1）			剑叶净光合速率/（μmol·m^-2·s^-1）
地点	处理	灌浆早期	灌浆中期	灌浆后期	灌浆早期	灌浆中期	灌浆后期
嘉善	0N	521 b	375 c	194 c	18.9 b	17.2 c	15.3 c
	LFP	648 a	415 b	272 b	24.2 a	21.0 b	17.4 b
	PCU	652 a	511 a	380 a	24.5 a	22.3 a	20.5 a
富阳	0N	538 b	402 c	215 c	18.5 b	16.4 c	14.8 c
	LFP	677 a	511 b	318 b	24.1 a	19.8 b	16.7 b
	PCU	659 a	587 a	394 a	23.9 a	21.5 a	19.3 a