Effects of Long-term Differential Fertilization on Soil Nitrogen in Irrigated Desert Soil

doi:10.7668/hbnxb.20195561

Abstract

Abstract:

To elucidate the distribution characteristics and evolution patterns of total nitrogen(TN)and hydrolytic nitrogen(HN)in irrigated desert soil profiles under long-term fertilization regimes,and to explore effective strategies for enhancing soil fertility and rational fertilization,it utilized soil samples(0-200 cm depth)collected in 2003 and 2022 from a long-term fertilization experiment established in 1982.TN and HN contents were measured across soil profiles,and their dynamic changes in the topsoil after 1,10,20,30,and 40 a of different fertilization treatments were analyzed.The results indicated that TN and HN contents gradually decreased with soil depth increasing under all fertilization regimes.Long-term combined application of organic manure and chemical fertilizers significantly increased TN content in surface soil.At the same time,treatments incorporating organic manure exhibited notably higher HN content in surface soil compared to those without organic inputs.Prolonged sole nitrogen fertilization led to TN profiles similar to those observed in unfertilized control plots.A significant positive correlation was identified between HN and TN across all fertilization regimes.Specifically,every 1.00 g/kg increase in TN under organic-amended treatments corresponded to a 71.57 mg/kg increase in HN.The findings demonstrate that long-term integrated organic-inorganic fertilization significantly enhances both TN and HN contents,thereby improving soil nitrogen fertility.Conversely,nitrogen depletion or excessive nitrogen-only applications reduced soil nitrogen fertility.These results highlight that combined organic and inorganic fertilization represents an effective approach for soil fertility improvement in irrigated desert soil regions.

Key words: Irrigated desert soil, Long term fertilization, Total nitrogen, Hydrolyzed nitrogen, Soil profile

CLC Number:

S158

DU Jian, ZHANG Jianwen, JIA Gaixiu, ZHAO Anyu, MA Lijun, SUO Dongrang, ZOU Yue, SUN Ningke. Effects of Long-term Differential Fertilization on Soil Nitrogen in Irrigated Desert Soil[J]. Acta Agriculturae Boreali-Sinica, 2025, 40(4): 157-165. doi: 10.7668/hbnxb.20195561.

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Figures/Tables 7

Fig.1 Analysis of dynamic changes in total nitrogen content in cultivated soil layer

Fig.2 Analysis of dynamic changes in hydrolyzed nitrogen content in cultivated soil layer

Fig.3 Total nitrogen content in soil profile Different letters indicate significant difference between treatments(P<0.05).The same as Fig.4.

Fig.4 Hydrolyzed nitrogen content in soil profile

Fig.5 Changes in total nitrogen content under long term different fertilization methods

Fig.6 Changes in hydrolyzed nitrogen content under long term different fertilization methods

Tab.1 The correlation between soil hydrolyzed nitrogen and total nitrogen

处理 Treatment	全氮均值/(g/kg) Average value of total nitrogen	水解氮均值/(mg/kg) Average value of hydrolyzed nitrogen	相关方程 Correlative equations	相关系数(r) Coefficient of correlation	样本数 Number of samples
2003	0.72	73.85	y=92.961x+6.803 3	0.862^**	56
2022	0.76	49.39	y=68.849x-2.643 5	0.980^**	56
不施有机肥No manure	0.67	56.49	y=81.288x+2.263 2	0.603^**	56
施有机肥Manure	0.81	66.74	y=71.571x+8.784 5	0.779^**	56
全部处理All treatment	0.74	61.62	y=74.016x+6.959 3	0.721^**	112

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