Using　natural　clinoptilolite　(NCP)　as　a　carrier　and　alginate　(Alg)-calcium　as　an　active　species,　the　porous　silicon　calcium　alginate　nanocomposite　(Alg-Ca-NCP)　was　successfully　fabricated　via　adsorption-covalence-hydrogen　bond.　Its　structural　features　and　physicochemical　properties　were　detailed　investigated　by　various　characterizations.　The　results　indicated　that　Alg-Ca-NCP　presented　the　disordered　lamellar　structures　with　approximately　uniform　particles　in　size　of　300–500　nm.　Specially,　their　surface　fractal　evolutions　between　the　irregular　roughness　and　dense　structures　were　demonstrated　via　the　SAXS　patterns.　The　results　elucidated　that　the　abundant　micropores　of　NCP　were　beneficial　for　unrestricted　diffusing　of　Alg-Ca,　which　was　conducive　to　facilitate　a　higher　loading　and　sustainable　releasing.　The　Ca　content　of　leaf　mustard　treated　with　Alg-Ca-NCP-0.5　was　484.5　mg/100g　on　the　21st　day,　higher　than　that　by　water　(CK)　and　CaCl2　solution　treatments,　respectively.　Meanwhile,　the　prepared　Alg-Ca-NCPs　presented　the　obvious　anti-aging　effects　on　peroxidase　drought　stress　of　mustard　leaves.　These　demonstrations　provided　a　simple　and　effective　method　to　synthesize　Alg-Ca-NCPs　as　delivery　nanocomposites,　which　is　useful　to　improve　the　weak　absorption　and　low　utilization　of　calcium　alginate　by　plants.　©　2024　Elsevier　Masson　SAS