The water-retaining functional slow-release fertilizer modified by carboxymethyl chitosan

Mingshang Liu; Jinxi Li; Bincheng Ren; Yan Liu; Zihan Liu; Tongtong Zhou; Dongdong Cheng

doi:10.1016/j.carbpol.2023.121744

The water-retaining functional slow-release fertilizer modified by carboxymethyl chitosan

Carbohydr Polym. 2024 Mar 15:328:121744. doi: 10.1016/j.carbpol.2023.121744. Epub 2023 Dec 29.

Authors

Mingshang Liu¹, Jinxi Li¹, Bincheng Ren¹, Yan Liu¹, Zihan Liu¹, Tongtong Zhou¹, Dongdong Cheng²

Affiliations

¹ National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
² National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Tai'an, Shandong 271018, PR China. Electronic address: chengdongdong163@126.com.

PMID: 38220354
DOI: 10.1016/j.carbpol.2023.121744

Abstract

To solve the problem of shortage of agricultural water resources and low utilization rate of fertilizer, a slow-release fertilizer based on chitosan modified water retention function was developed. Solution polymerization and semi-interpenetrating network technology were used to load urea aldehyde into carboxymethyl chitosan superabsorbent resin network. This technology realizes the simultaneous slow release of nutrients and water by using modified chitosan, which has important implications for the application of chitosan in agriculture to regulate the soil water and fertilizer conditions. The optimal preparation conditions were: MBA 0.07 %, KPS 0.8 %, AM to AA mass ratio of 0.3:1, CMC content of 10 %, AA neutralization degree 85 %, UF 20 %, AA+AM mass sum of 10 g, reaction temperature 70 °C and reaction time 2 h. The maximum water absorption rate of the optimized NC reached 172.3 g/g. The cumulative release of nitrogen in 30 days was 83.67 %. The application of NC in sandy soil promoted seed germination and growth. The comprehensive results indicate that NC has broad application prospects in arid areas based on its excellent water retention and nutrient release performance.

Keywords: Chitosan; Nutrient-water carrier; Slow-release fertilizer; Superabsorbent resin.