| Effects of agricultural use of sewage sludge on phosphorus fractions and crop yield in irrigated desert soil |
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| DOI：10.7606/j.issn.1000-7601.2026.04.28 |
| Key Words: sewage sludge irrigated desert soil phosphorus fractions wheat corn long\|term fertilization |
| Author Name | Affiliation | | YE Gengkang | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | E Shengzhe | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Institute of Soil and Fertilizer and Save Water Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | YUAN Jinhua | Institute of Soil and Fertilizer and Save Water Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | ZHAO Tianxin | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YANG Yuntao | Institute of Soil and Fertilizer and Save Water Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | BAI Yanping | Institute of Soil and Fertilizer and Save Water Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | XIAO Juan | Institute of Soil and Fertilizer and Save Water Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To investigate the regulatory effects of different sewage sludge application rates on soil phosphorus characteristics and crop yield, a long\|term field positioning experiment initiated in 2013 was conducted in the irrigated desert soil of the Hexi Corridor. Five treatments were established: conventional fertilization, conventional fertilization + 600 kg·hm-2 sewage sludge, conventional fertilization + 1 200 kg·hm-2 sewage sludge, conventional fertilization + 1 200 kg·hm-2 sewage sludge combined with green manure incorporation, and conventional fertilization + 1 200 kg·hm-2 sewage sludge combined with green manure removal. The results showed that sewage sludge application significantly increased wheat yield and plant phosphorus content, but had no significant effect on corn grain yield. Compared with the conventional fertilization treatment, the 5-year average grain yield of wheat under sewage sludge treatments increased by 17.99%-28.97%, phosphorus content in wheat straw and grain increased by 30.62%-54.45% and 18.00%-28.97%, respectively, and phosphorus content in corn straw increased by 6.51%-14.19%. Regarding soil phosphorus indicators, sewage sludge application increased soil total phosphorus and available phosphorus contents by 51.37%-76.25% and 80.00%-243.20%, respectively, compared with conventional fertilization, and increased Ca2-P, Ca8-P, and Fe-P contents by 87.76%-226.52%, 69.54%-134.18%, and 73.17%-176.23%, respectively. Among the four sludge treatments, the high\|rate sludge combined with green manure incorporation treatment exhibited the best effect on increasing the ratio of available phosphorus to total phosphorus, with an increase of 112.50%, compared with conventional fertilization. Correlation analysis indicated that Ca8-P exhibited the highest contribution to soil total phosphorus content (R2=0.821), while Ca2-P contributed most to soil available phosphorus content (R2=0.966). Available phosphorus content was significantly positively correlated with wheat yield. Considering both crop yield improvement and soil phosphorus amelioration benefits, the cultivation model of conventional fertilization + 1 200 kg·hm-2 decomposed sewage sludge combined with interplanted hairy vetch (Vicia villosa) green manure incorporation represents an optimal fertilization strategy for the irrigated desert area of the Hexi Corridor. |
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