Peranan GA3 terhadap Kerontokan dan Kualitas Buah Jeruk Pamelo Berbiji dan Tidak Berbiji

Ummu Kalsum; Slamet Susanto; Ahmad Junaedi; Nurul Khumaida; Heni Purnamawati

doi:10.24831/jai.v49i3.38306

Ummu Kalsum Program Studi Agroteknologi, Fakultas Teknologi Industri, Universitas Gunadarma Jl. Margonda Raya No. 100, Depok 16424, Indonesia https://orcid.org/0000-0003-4290-4799
Slamet Susanto Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor (IPB University), Jl. Meranti, Kampus IPB Darmaga, Bogor 16680, Indonesia
Ahmad Junaedi Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor (IPB University), Jl. Meranti, Kampus IPB Darmaga, Bogor 16680, Indonesia
Nurul Khumaida Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor (IPB University), Jl. Meranti, Kampus IPB Darmaga, Bogor 16680, Indonesia
Heni Purnamawati Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor (IPB University), Jl. Meranti, Kampus IPB Darmaga, Bogor 16680, Indonesia

DOI: https://doi.org/10.24831/jai.v49i3.38306

Abstract

Fruit drop occurs frequently and causes low fruit harvesting. The information about the use of the hormone GA3 in suppressing fruit drop in pummelo is still not available. This research aimed to examine the role of GA3 on fruit drop and fruit quality in seeded and seedless pummelo. This research was conducted from December 2019 until June 2020 in Tambakmas Village, Sukomoro District, Magetan Regency. The experiment used a nested design with two factors, i.e., cultivars as the main factor (Bali Merah 1 and Bali Merah 2) and spraying GA3 as a nested factor (without spraying GA3, sprayed with GA3 at 1st week after anthesis (WAA), and sprayed with GA3 at 1st and 3rd WAA). Bali Merah 1 belongs to seeded pummelo, while Bali Merah 2 is a seedless pummelo. The observation variables consisted of the concentration of GA3 at 4th, 5th, and 6th WAA, final set, the number of fruit drop, fruit weight and diameter, edible portion, total soluble solids (TSS), total titratable acidity (TTA), TSS/ATT ratio, and vitamin C. The result showed that the GA3 spraying increased the final set of pummelo but the treatment had no significant affected on fruit weight, fruit diameter, TTA, TSS/TTA ratio, and vitamin C content. The GA3 spraying at 1st and 3rd WAA suppressed fruit drop and increased the GA3 concentration of fruit at 4th, 5th and 6th WAA, the edible portion and TSS of pummelo fruit.

Keywords: final set, total titratable acidity, total soluble solids, vitamin C