| Effects of different straw returning methods on organic nitrogen in potato farmland in semi\|arid rainfed areas |
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| DOI：10.7606/j.issn.1000-7601.2025.03.18 |
| Key Words: potato straw mulching return soil total nitrogen soil acidolysis organic nitrogen yield |
| Author Name | Affiliation | | XIAO Xinyue | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | PANG Lei | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | YANG Jin | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | HU Nannan | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | WANG Xiaoyan | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | YANG Yanbin | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | SHAO Zehe | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | ZHENG Haofei | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | LU Jianlong | College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | TAN Xuelian | Institute of Dryland Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730000, China | | ZHANG Boyu | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China | | ZHAO Mingying | Key Laboratory of Dry Habitat Crop Science in Gansu Province, Lanzhou, Gansu 730000, China； College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730000, China； Experimental Teaching Center of Plant Production, Gansu Agricultural University, Lanzhou, Gansu 730000, China |
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| Abstract: |
| To examine the effects of different straw returning methods on soil acid\|hydrolysable organic nitrogen and potato yield in rainfed potato fields in the semi\|arid region of Northwest China, a field experiment was conducted from 2022 to 2023 with four treatments: bare land (CK), plastic film mulching (PM), crushed straw returning (SR), and whole\|straw strip mulching (SM). The study analyzed soil total nitrogen (TN), acid\|hydrolysable organic nitrogen fractions—including amino acid nitrogen (AAN), ammonium nitrogen (AN), hydrolysable unknown nitrogen (HUN), and amino sugar nitrogen (ASN)—as well as the C/N ratio, soil organic matter (SOM) content, and potato yield. The results showed that SR and SM treatments significantly enhanced the accumulation of TN and total hydrolysable nitrogen (HN) in the 0~60 cm soil layer. Specifically, SM increased TN and HN by 4.33% and 12.51%, respectively, compared to SR. In contrast, PM negatively affected TN and HN accumulation in the 0~60 cm layer, reducing them by 7.85% and 8.48% relative to CK. The concentrations of acid\|hydrolysable organic nitrogen fractions across all treatments followed the order: AAN > AN > HUN > ASN. Both SR and SM treatments increased the contents of AAN, AN, and ASN to varying degrees. Compared to CK, PM and SR elevated the soil C/N ratio in the 0~60 cm layer in 2023, while SM reduced it. SR and SM significantly improved SOM content in the 0~60 cm layer, with SR exhibiting a 9.82% higher SOM than SM. However, PM reduced SOM content in the 0~20 cm layer by 5.32% compared to CK. In 2023, potato yields under SR and SM treatments increased significantly by 23.97% and 16.81%, respectively, compared to CK, with benefit\|cost ratios rising by 18.85% and 21.31%. In conclusion, whole\|straw strip mulching (SM) more effectively enhances soil nitrogen supply capacity, improves soil fertility, and increases potato yield, making it the recommended straw\|returning practice for rainfed potato fields in semi\|arid regions. |
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