Effect of side-deep application of urea on yield and nitrogen use efficiency of double-season rice

doi:10.16178/j.issn.0528-9017.20250318

Abstract

Abstract:

A field experiment was conducted to investigate the effects of urea side-deep application on the yield and nitrogen use efficiency of double-season rice，and to provide a theoretical basis for efficient nitrogen fertilizer utilization in double-season rice production in southern Zhejiang Province. Four treatments were established：1）no nitrogen fertilizer（CK）；2）conventional fertilization（CF）；3）urea side-deep application（UD1）；4）urea side-deep application with 10% nitrogen reduction（UD2）. The results showed that compared with the CK treatment，nitrogen fertilization significantly （p<0.05）increased the yield of early-season rice and late-season rice by 31.7%-41.6% and 42.9%-47.9%，respectively. Compared with the CF treatment，urea side-deep application significantly increased the yield of early-season rice，while no significant difference in double-season rice yield was observed between the UD1 and UD2 treatments. Under urea side-deep application treatments，both grain nitrogen uptake and total nitrogen uptake of early-season and late-season rice were significantly higher than those under the CF treatment. Compared with the CF treatment，urea side-deep application significantly increased the apparent nitrogen use efficiency and nitrogen contribution rate of early-season rice，as well as the apparent nitrogen use efficiency of late-season rice. In addition，the UD2 treatment significantly increased the agronomic efficiency and partial factor productivity of nitrogen fertilizer for early-season rice，and the partial factor productivity of nitrogen fertilizer for late-season rice. Therefore，the adoption of urea side-deep fertilization technology in double-season rice production in southern Zhejiang Province can achieve the goals of high and stable rice yield and efficient nitrogen fertilizer utilization.

Key words: double-season rice, nitrogen fertilizer, yield, nitrogen uptake, nitrogen use efficiency

CLC Number:

S511

YANG Haiqin, YE Tingyun, HU Zefan, MA Liya, CHEN Zhaoming. Effect of side-deep application of urea on yield and nitrogen use efficiency of double-season rice[J]. Journal of Zhejiang Agricultural Sciences, 2026, 67(6): 1438-1442.

Figures/Tables 3

References 19

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处理	早稻产量	晚稻产量
CK	5 134 c	5 204 b
CF	6 760 b	7 434 a
UD1	7 251 a	7 696 a
UD2	7 271 a	7 550 a

处理	早稻产量	晚稻产量
CK	5 134 c	5 204 b
CF	6 760 b	7 434 a
UD1	7 251 a	7 696 a
UD2	7 271 a	7 550 a

处理	早稻吸氮量			晚稻吸氮量
处理	籽粒	秸秆	总	籽粒	秸秆	总
CK	58.9 c	27.8 c	86.7 c	68.4 c	19.5 b	87.9 c
CF	88.6 b	33.9 b	122.5 b	98.3 b	30.3 a	128.6 b
UD1	104.9 a	37.3 ab	142.1 a	115.4 a	31.8 a	147.2 a
UD2	104.7 a	43.2 a	147.9 a	119.8 a	30.8 a	150.7 a

处理	早稻吸氮量			晚稻吸氮量
处理	籽粒	秸秆	总	籽粒	秸秆	总
CK	58.9 c	27.8 c	86.7 c	68.4 c	19.5 b	87.9 c
CF	88.6 b	33.9 b	122.5 b	98.3 b	30.3 a	128.6 b
UD1	104.9 a	37.3 ab	142.1 a	115.4 a	31.8 a	147.2 a
UD2	104.7 a	43.2 a	147.9 a	119.8 a	30.8 a	150.7 a

处理	早稻				晚稻
处理	氮肥表观利用率/%	氮肥农学效率/ （kg·kg^-1）	氮肥偏生产力/ （kg·kg^-1）	氮肥贡献率/ %	氮肥表观利用率/%	氮肥农学效率/（kg·kg^-1）	氮肥偏生产力/ （kg·kg^-1）	氮肥贡献率/%
CF	19.9 c	9.0 b	37.6 b	23.9 b	22.6 b	12.4 a	41.3 b	30.0 a
UD1	30.8 b	11.8 ab	40.3 ab	29.1 a	32.9 a	13.8 a	42.8 ab	32.3 a
UD2	37.8 a	13.2 a	44.9 a	29.4 a	38.8 a	14.5 a	46.6 a	31.0 a