Integrated application of inorganic fertilizer with fulvic acid for improving soil nutrient supply and nutrient use efficiency of winter wheat in a salt-affected soil

被引:40
作者
Liu, Xiaoyuan [1 ,2 ]
Yang, Jingsong [1 ]
Tao, Jianyu [3 ]
Yao, Rongjiang [1 ]
机构
[1] Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Christian Albrechts Univ Kiel, Inst Plant Nutr & Soil Sci, Kiel, Germany
基金
中国国家自然科学基金;
关键词
Nutrient use efficiency; Salt-affected soil; Fulvic acid; Grain yield; Sustainability; Multiple regression; HUMIC-ACID; NITRATE CONTAMINATION; NITROGEN-BALANCE; CALCAREOUS SOILS; ORGANIC-MATTER; PLANT-GROWTH; CROP YIELDS; PHOSPHORUS; MANAGEMENT; SORPTION;
D O I
10.1016/j.apsoil.2021.104255
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Establishing better nitrogen (N) management strategies is of great significance for sustaining crop production and reducing environmental pollution. However, there is limited knowledge about N fertilizer management practices with soil nutrient supply, N leaching, crop productivity and nutrient use efficiency (NUE) reaching the desired level simultaneously. In this study, pot experiment was conducted to evaluate the effects of N fertilizer and in combination with fulvic acid (FA) on NUE and nutrient supply in a moderate-salinized soil (with total salt content 3.30 g kg- 1 and EC1:5 1.18 dS m-1). Ten treatments were included: treatment without any addition (CK); 100%, 85% and 70% of the conventional inorganic N fertilizer addition rate (100% CF, 85% CF and 70% CF); 100% CF, 85% CF and 70% CF combined with 75 kg ha-1 FA (100% CF + F1, 85% CF + F1, and 70% CF + F1), respectively; and 100% CF, 85% CF and 70% CF combined with 150 kg ha- 1 FA (100% CF + F2, 85% CF + F2, and 70% CF + F2), respectively. In order to further investigate the effects of combining N fertilizer and FA applications on soil N leaching losses, part of the fertilizer management practices were selected to conduct a soil leaching experiment. The results demonstrated that the Olsen-P for the upper 20 cm of soil was significantly affected by N fertilization (P <= 0.01). In the treatments with inorganic fertilization alone, the concentration of soil mineral N at 0-10 cm soil depth decreased with decreasing level of fertilizer N, while Olsen-P content and alkaline phosphatase activity decreased with increasing N fertilizer application rate. The application of FA significantly increased alkaline phosphatase activity. Overall, the total mineral N leaching losses increased exponentially with increasing annual fertilizer N application rates, while the addition of FA decreased the total mineral N leaching factor (TLFN). Furthermore, the results of multiple regression analysis revealed that wheat grain yield, plant P uptake, plant N uptake, harvest index of applied fertilizer N (HIN), partial factor productivity of applied fertilizer P (PFPP), recovery efficiency of P (REP) and recovery efficiency of N (REN) reached >= 85% of their maximum concurrently, when the application amounts of N fertilizer and FA varied from 300 to 370 kg ha- 1 and from 164 to 250 kg ha- 1, respectively. These results of this study provide a basis for appropriate nitrogen (N) management in salt-affected soils and for the improvement of the sustainability of agricultural development in China.
引用
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页数:13
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