Effect of Nitrogen Application Levels on Soil Organic Nitrogen Fractions and Nitrogen Utilization Rates

doi:10.7668/hbnxb.20194815

Abstract

Abstract:

The aim was to clarify the effects of different nitrogen application levels on soil organic nitrogen fractions and nitrogen use efficiency in maize fields in the central-western region of Inner Mongolia,so as to provide a reference for the scientific management of soil nitrogen and sustainable development of modern agriculture.Six nitrogen application levels were set up,N0(0 kg/ha),N8(120 kg/ha),N12(180 kg/ha),N16(240 kg/ha),N20(300 kg/ha),and N24(360 kg/ha).The dynamic changes with effects of nitrogen application on soil total nitrogen content,particulate organic nitrogen content,light fraction organic nitrogen content and heavy organic nitrogen content,as well as maize yield and nitrogen use efficiency were analyzed at different soil layers at pre-sowing and post-harvest.The results showed that soil total nitrogen,particulate organic nitrogen,light fraction organic nitrogen,and heavy fraction organic nitrogen content decreased with deepening of the soil layer at the same nitrogen application level;soil total nitrogen content at pre-sowing increased with the nitrogen application levels.Soil total nitrogen content in the N16,N20,and N24 treatments was significantly higher than that in the N0,N8,and N12 treatments at post-harvest.Soil particulate organic nitrogen content of N16 treatment was highest in the 0—10 cm,10—20 cm,and 20—40 cm soil layers at pre-sowing,with 0.14,0.13,and 0.09 g/kg,respectively.At post-harvest,N16 treatment had the highest content in the 10—20 cm,20—40 cm,and 40—60 cm soil layers,with 0.19,0.10,and 0.09 g/kg,respectively.The highest increase of soil light fraction organic nitrogen content of 37.27% was in the N16 treatment,and the highest increase of soil heavy fraction organic nitrogen content of 7.35% was in the N24 treatment,followed by the N16 treatment,at 6.84%.The N16 treatment had the highest maize biological yield of 31 443.50 kg/ha;the highest maize economic yield of 18 526.47 kg/ha;and the nitrogen use efficiency decreased with the increase in nitrogen fertilizer application levels,N16 treatment in the nitrogen harvest index was the highest, at 79.20%.In conclusion,the more suitable nitrogen fertilizer application level in the central-western region of Inner Mongolia should be maintained under 240 kg/ha,in order to achieve the best soil nitrogen management ang crop yield.

Key words: Nitrogen application level, Total nitrogen, Particulate organic nitrogen, Light fraction organic nitrogen, Heavy fraction organic nitrogen, Maize yield, Nitrogen use efficiency

LAN Huiqing, MENG Tiantian, ZHANG Xiangqian, WANG Weini, ZHANG Jun, CHEN Liyu, LU Zhanyuan, SUN Xia. Effect of Nitrogen Application Levels on Soil Organic Nitrogen Fractions and Nitrogen Utilization Rates[J]. Acta Agriculturae Boreali-Sinica, 2025, 40(1): 166-176. doi: 10.7668/hbnxb.20194815.

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Figures/Tables 7

Fig.1 Effect of nitrogen application levels on soil total nitrogen content Different lowercase letters indicate significant differences between treatments(P<0.05).The same as Fig.2—4.

Fig.2 Effect of nitrogen application levels on soil particulate organic nitrogen content

Fig.3 Effect of nitrogen application levels on soil light fraction organic nitrogen content

Fig.4 Effect of nitrogen application levels on soil heavy fraction organic nitrogen content

Tab.1 Difference analysis of the effects nitrogen application levels on maize yield and harvest index

处理 Treatment	生物产量/(kg/hm²) Biological yield	经济产量/(kg/hm²) Economic yield	收获指数 Harvest index
N0	20 987.25±380.95c	11 785.78±1 956.21b	0.560±0.071b
N8	27 446.75±2 366.72b	17 518.37±523.77a	0.640±0.038ab
N12	28 754.25±2 362.67ab	18 420.86±931.08a	0.640±0.043ab
N16	31 443.50±1 446.27a	18 526.47±470.66a	0.590±0.019ab
N20	27 078.50±2 171.35b	18 275.04±555.94a	0.680±0.072a
N24	25 898.00±780.66b	16 876.97±367.01a	0.650±0.034ab

Tab.2 Effect of nitrogen application levels on nitrogen use efficiency

处理 Treatment	氮收获指数/% NHI	氮肥表观回收效率/% ANRE	氮肥吸收效率/(kg/kg) NUPE	氮肥农学效率/(kg/kg) NAE	氮肥偏生产力/(kg/kg) NPFP
N0	75.12±0.88b	—	—	—	—
N8	77.56±0.84a	89.18±5.52a	2.050±0.055a	47.77±11.42a	145.99±4.36a
N12	77.02±1.24ab	71.59±4.00b	1.490±0.040b	36.86±8.18b	102.34±5.17ab
N16	79.20±0.90a	69.32±7.03b	1.270±0.070c	28.09±5.06c	77.19±1.96bc
N20	74.95±1.24b	38.03±2.11c	0.840±0.021d	21.63±7.17d	60.92±1.85c
N24	78.85±1.62a	22.34±2.26d	0.610±0.023e	14.14±4.91e	46.88±1.02c
F	7.362	104.330	439.810	8.630	422.900
P	^**	^**	^**	^**	^**

Fig.5 Correlation analysis of soil nitrogen fractions with yield and nitrogen use efficiency indexes NA.Nitrogen application level;TNC.Total nitrogen content;HFONC.Heavy fraction organic nitrogen content;LFONC.Light fraction organic nitrogen content;PONC.Particulate organic nitrogen content;Y.Yield;NHI.Nitrogen harvest index;ANRE.Nitrogen apparent recovery efficiency;NUPE.Nitrogen fertilizer uptake efficiency;NAE.Nitrogen fertilizer agronomic efficiency;NPFP.Nitrogen fertilizer bias productivity.*.P<0.05;**.P<0.01.

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