Induksi Pembuahan Mutan Sinar Gamma Entres Jeruk Tawangmangu Dengan Perlakuan Nano Nutrien

Declining yields of Tawangmangu tangerine (Citrus reticulata var. Tawangmangu) are linked to sub?optimal growing environments, especially high temperatures that suppress the crop’s transition into the generative phase. This study evaluated the effects of gamma?ray mutagenesis and nano?nutrient fertiliser on flowering and fruiting of grafted (entres) scions. A randomised complete block design with a 2 × 4 factorial arrangement was employed in Kembanglimus Village, Magelang (Nov 2023 – Sep 2024). Factor A comprised two gamma doses (50 Gy and 60 Gy), while Factor B comprised four nano?nutrient concentrations (0, 1, 2, and 3 mL L?1). Eight treatment combinations were replicated five times. Data for eleven generative parameters were subjected to ANOVA; significant effects were followed by LSD and orthogonal polynomial tests. The 50 Gy dose produced heavier fruit (147.01 g), thicker peel (3.02 mm), larger juice volume (51.17 cm3), and higher vitamin C content (66.24 mg 100 g?1) than 60 Gy. Nano?nutrient application significantly increased flower, fruit and seed numbers, showing linear to quadratic gains up to 3 mL L?1; model extrapolation indicated a flowering optimum at 3.594 mL L?1. No significant gamma × nano interaction was detected. These results suggest that moderate gamma exposure (50 Gy) combined with targeted nano?nutrient supplementation can effectively stimulate the generative phase and improve fruit quality of Tawangmangu tangerine grown under warm?temperature conditions.