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Pseudoplastic liquid mulch film incorporating waste lignin and starch to improve its sprayability and available soil nitrogen.
- Source :
-
Chemical Engineering Journal . Nov2023, Vol. 475, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- • Lignin incorporated into starch-based liquid mulch became a pseudoplastic fluid. • Pseudoplastic liquid mulch was easily sprayed and formed a complete film on soil. • Prepared LSA liquid mulch increased the content of available soil nitrogen. • Chinese cabbage yield was increased using the LSA mulch with slow-release urea. Because traditional slow-release fertilizers cannot effectively retain soil heat and moisture, their ability to increase crop yields is limited. To solve this problem, novel sprayable liquid mulch films (lignin-starch-acrylate, LSA) were prepared with a slow-release urea function, created by emulsion polymerization between lignin (extracted from papermaking waste liquor), starch, and acrylate monomers. The introduction of lignin transformed the LSA emulsion into a pseudoplastic fluid with enhanced sprayability. The presence of lignin in LSA film increased the elongation at break and lowered the Young's modulus, resulting in a film that is more easily pierced by crop seedlings and preserves the heat and moisture of the soil after seedling piercing. Experimental results showed that at a mass ratio of lignin to acrylate monomers of 3/7, the LSA mulch film had good sprayability and film-forming properties, suitable mechanical properties, and the lowest urea release rate. This optimized LSA film exhibited better soil insulation and water retention performance than other slow-release fertilizers. The contents of available soil nitrogen, including NH 4 +-N and NO 3 −-N, in soil covered with LSA film were 44.82 and 45.49% higher than those in soil covered with urea, respectively, and the corresponding cabbage yields increased by 33.73%. The results of this study provide a new method for preparing agricultural materials with urea slow-release as well as soil moisture and heat preservation functions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 475
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 173233465
- Full Text :
- https://doi.org/10.1016/j.cej.2023.146392