Effort to increase off-season production and fruit quality of siam orange (Citrus nobilis var. microcarva L.) through application of mycorrhizal inoculants and auxin Ni Komang Alit Astiari 1*, Ni Putu Anom Sulistiawati 1, and I Nyoman Rai 2
1 Agrotechnology Study Program, Faculty of Agriculture, Warmadewa University, Denpasar, Bali
2 Agroecotechnology Study Program, Faculty of Agriculture, Udayana University, Denpasar, Bali
Abstract
This study aims to determine the efforts to overcome the death of fruit and improve the quality of siam oranges outside the season through the application of mycorrhizal inoculants and concentrations of auxin growth regulators. This experiment used a randomized block design with 2 factors. The first factor: mycorrhizal inoculant dose (0, 50, and 100 g/tree), while the second factor: auxin concentration (0, 50, 100, and 150 ppm/tree), repeated 3 times. The results showed that the interaction of mycorrhizal inoculant dose and auxin concentration did not significantly affect all observed variables. Dosage of mycorrhizal inoculant 100 g/tree can increase fruit production out of-season and the quality of conjoined citrus fruit, as reflected in the increasing number of fruits harvested per tree (152.27 fruits), weight per fruit (98.00 g), fruit harvest weight per tree (15.53 kg) and total dissolved solids (14.10%), or an increase of 44.21%; 11.89%; 57.87% and 21.03%, compared without mycorrhizal inoculants (108.58 pieces; 88.80 g; 10.57 kg and 11.65% brix). Concentration of 100 ppm auxins/tree can increase off-season production and the quality of conjoined citrus fruits, reflected in the higher number of fruits/trees harvested (165.22 fruits), fruit weight per tree (17.03 kg)), weight per fruit (99.50 g) and total dissolved solids (14.43%brix), compared without auxin, 112.11 sheets; 10.44 kg; 84.66 g; and 11.15% brix.
Keywords: fruit quality, IBA, mycorrhizae, off-season, Siam orange
