title: Nitrate, ascorbic acid, mineral and antioxidant activities of Cosmos caudatus in response to organic and mineral-based fertilizer rates.
abstract: The source and quantity of nutrients available to plants can affect the quality of leafy herbs. A study was conducted to compare quality of Cosmos caudatus in response to rates of organic and mineral-based fertilizers. Organic based fertilizer GOBI (8% N:8% P₂O₅:8% K₂O) and inorganic fertilizer (15% N, 15% P₂O₅, 15% K₂O) were evaluated based on N element rates at 0, 30, 60, 90, 120 kg h⁻¹. Application of organic based fertilizer reduced nitrate, improved vitamin C, antioxidant activity as well as nitrogen and calcium nutrients content. Antioxidant activity and chlorophyll content were significantly higher with increased fertilizer application. Fertilization appeared to enhance vitamin C content, however for the maximum ascorbic acid content, regardless of fertilizer sources, plants did not require high amounts of fertilizer.
authors: Department of Crop Science, Universiti Putra Malaysia, Serdang Selangor 43400, Malaysia. aishah@agri.upm.edu.my
authors: Siti Aishah
authors: SA
authors: Hassan
authors: Salumiah
authors: S
authors: Mijin
authors: Umi Kalsom
authors: UK
authors: Yusoff
authors: Phebe
authors: P
authors: Ding
authors: Puteri Edaroyati Megat
authors: PE
authors: Wahab
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D001205:Ascorbic Acid / Q000032:analysis*; D019659:Asteraceae / Q000737:chemistry* / Q000187:drug effects; D002734:Chlorophyll / Q000032:analysis; D005308:Fertilizers; D007501:Iron / Q000737:chemistry; D008903:Minerals / Q000494:pharmacology*; D009566:Nitrates / Q000032:analysis*; D009930:Organic Chemicals / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry / Q000187:drug effects; D013858:Thiobarbiturates / Q000737:chemistry; D013861:Thiocyanates / Q000737:chemistry
chemical_list: D000975:Antioxidants; D005308:Fertilizers; D008903:Minerals; D009566:Nitrates; D009930:Organic Chemicals; D013858:Thiobarbiturates; D013861:Thiocyanates; D002734:Chlorophyll; C103724:ferric thiocyanate; D007501:Iron; C029684:thiobarbituric acid; D001205:Ascorbic Acid