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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Buletin Agrohorti Jurnal Fitopatologi Indonesia Jurnal Hortikultura Indonesia (JHI) Jurnal Hortikultura Journal of Tropical Crop Science

Ketty Suketi

Departemen Agronomi Dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Program Studi Agronomi Dan Hortikultura, Sekolah Pascasarjana Institut Pertanian Bogor, Jl. Meranti Kampus IPB Dramaga, Bogor 16680, Indonesia.

Author-ID : 390299

Agriculture, Biological Sciences & Forestry Economics, Econometrics & Finance Medicine & Pharmacology

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Fruit Coating with Chitosan and Beeswax to Increase Papaya Shelf Life Mukdisari, Yurisqi; Suketi, Ketty; Widodo, Winarso Drajad
Journal of Tropical Crop Science Vol 3 No 3 (2016): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Papaya (Carica papaya) is a climacteric fruit with an increased respiration rate during ripening process. Papaya respiration rate can be inhibited by providing a coating on the surface of the fruits, including chitosan, a polysaccharide derived from shrimp shell waste, or beeswax.The purpose of this research was to examine the effects of chitosan and beeswax coating on the shelf life and quality of papaya Callina fruit during storage. Results of the experiments showed that fruit coating with chitosan and beeswax can extend the shelf life of papaya Callina by four to five days compared to control due to inhibition respiration rate of papaya fruits during storage.The use of chitosan and beeswax was beneficial to maintain the physical and chemical quality of papaya Callina fruits.

Growth and Development of Potted Ornamental Chilli (Capsicum annuum L.) with Different Types of Fertilizer and Growing Media Putra, Bagas Akmala; Suketi, Ketty; Syukur, Muhamad
Journal of Tropical Crop Science Vol 4 No 2 (2017): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Chilli has great potential to be marketed as ornamental potted plants due to their diversity in colours and shape of the fruits. The purpose of this research was to determine the optimum growing media and types of fertilizer to improve the performance of three varieties of potted ornamental chilli, ”Syakira”, “Lembayung”, and “Ayesha”. This research was conducted in Cikabayan greenhouse, Bogor Agricultural University, from December 2016 until May 2017. The experiment was arranged in a split plot design with fertilizer as the main factor (without fertilizer, P0; AB mix; P1, and NPK + Gandasil D, P2) and growing media as sub plots, i.e. charcoal husk : soil : manure (M1), perlite: soil : manure (M1), and cocopeat : soil: manure (M3) with proportion of 2:1:1 (v/v). NPK fertilizer and foliar fertilizer Gandasil D showed the maximum plant height, number of branches, number of flowers and fruits. “Ayesha” treated with AB mix fertilizer had the largest fruit diameter whereas “Syakira” and “Ayesha” had the longest fruit under the same treatment. Ornamental chilli grown on charcoal husk and cocopeat had the maximum number of branches and flowers per plant. “Syakira” grown on charcoal husk with AB mix and NPK + Gandasil D, “Lembayung” using cocopeat with AB mix fertilizer, and “Ayesha” varieties using charcoal husk with AB mix fertilizer were the most preferred by the consumers.

Potassium Sources and Rates for Drip Irrigated Polyethylene Mulched Chilli Pepper Hamdani, Kiki Kusyaeri; Susila, Anas Dinurrohman; Purwono, Purwono; Suketi, Ketty
Journal of Tropical Crop Science Vol 6 No 02 (2019): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Fertigation with drip irrigation is one of the technologies to solve fertilization and irrigation problems in chilli pepper production using polyethylene mulch. Potassium (K) is one of the important macro nutrients that affect plant growth and development due to its roles in the biochemical and the biophysical processes in plants. The objective of this study was to determine the best sources and the optimum rates of potassium for drip irrigated polyethylene mulched chilli pepper field production. The study was conducted in January until July 2018 at Tajur Experimental Farm, Center for Tropical Horticulture Study, Bogor Agricultural University. The experimental design was a split plot with the K sources (KCl, ZK, NPK) as main plots and K rates that consisted of five levels (0, 68, 136, 204, 272 kg K2O. ha-1) as sub-plots. The results showed that the best optimum rate of K to produce fruit is 101.11 kg K2O.ha-1 with a maximum yield of 2.26 t.ha-1. Chilli crops fertilized with NPK and KCl had the greatest fruit weight per plant, fruit weight per plot, and fruit weight per hectare.

Nitrogen Sources and Rate for Drip Irrigated Polyethylene Mulched Chilli Pepper Deli, Syekh Zulfadli Arofah; Susila, Anas Dinurrohman; Purwono, Purwono; Suketi, Ketty
Journal of Tropical Crop Science Vol 6 No 02 (2019): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Chilli pepper is the one of most important vegetable crops in Indonesia, and nitrogen is an essential macronutrient ‎to support plant growth. This study was conducted to determine the best source of nitrogen (N) and its optimum rate ‎for drip irrigated polyethylene mulched chilli pepper at. The study site is located at ‎‎ Tajur II ‎Experimental Field of Center for Tropical Horticulture Studies Bogor Agricultural University, West Java, Indonesia, 250 m above the sea level (-6.6364580S, 106.8231460E) from January to August 2018. The experiments were organized in a factorial split-plot with sources of‎ N fertilizer as the main plots (Urea, ‎NPK, and ZA) and rates of N as a sub-plots (0, 115, 230, 345, and 460 kg.ha-‎‎1). The ‎results showed that NPK fertilizer had the best source of N compared to ‎other sources. The maximum yield of 9.01 kg per plot, or equivalent to ‎10.46 t.ha-1, was obtained with N fertilization at 265 to 295 kg.ha-1.‎

Correlations of Nitrogen, Phosphorus, Potassium, Pigments and Total Flavonoids of Moringa oleifera Lam. Leaves in the Vegetative and Generative Phases Rasmani, Rasmani; Aziz, Sandra Arifin; Suketi, Ketty
Journal of Tropical Crop Science Vol 7 No 02 (2020): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Moringa oleifera is universally known as the miracle plant or the tree of life. Moringa leaf extract contains phenolic acids and flavonoids, especially flavonols (quercetin, kaempferol, isorhamnetin glycosides) and flavones (apigenin). This study aimed to elucidate any correlations between nutrient, pigment, and flavonoid concentrations for different leaf positions and different growth phases. The results showed that pigment and total flavonoid concentrations increased from the 1st leaf to the 5th leaf, while nutrient concentration decreased. Pigment concentration, total flavonoid, and nutrient concentration were higher in the vegetative phase than the generative phase. The concentration of nutrients in the generative plants displayed a significant positive correlation with chlorophyll concentration. The 1st to 5th leaf of the vegetative plants can be used as indicator leaves for tissue analysis of the moringa plant.

Correlations between Leaf Nitrogen, Phosphorus and Potassium and Leaf Chlorophyll, Anthocyanins and Carotenoids Content at Vegetative and Generative Stage of Bitter Leaf (Vernonia amygealina Del.) Betty Tjhia; Sandra Arifin Aziz; Ketty Suketi
Journal of Tropical Crop Science Vol. 5 No. 1 (2018): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Vernonia amygdalina Del. (Asteraceae) is a nutritional and medicinal plant that is used widely throughout tropical Africa and other countries. The leaves are proved to have strong antioxidant property. The concentration of chlorophyll a, chlorophyll b, anthocyanins and carotenoids in five different leaf positions of vegetative and generative phases were studied. The aim of the study is to understand and to correlate the content of the three nutrients and the bioactive compounds along the five leaf positions at vegetative and generative stage of the crop growth. The study showed that the concentration of chlorophyll a and b was higher, and anthocyanin concentration was almost zero in the generative than in the vegetative stage. The leaf concentration of N, P, and K were higher in vegetative than in generative stage. At vegetative stage, N positively correlated with chlorophyll a at the 1st leaf; K had strong correlations with anthocyanins at the 2nd and 3rd leaf and with chlorophyll a at the 2nd and 5th, and with chlorophyll b and carotenoids at the 5th leaf. At the generative stage, P had a strong positive correlation with carotenoids at 4th and 5th leaves, and K positively correlated with chlorophyll a and b at 5th leaf. The findings suggest that bitter leaf is better to be harvested at vegetative stage, and that potassium level is important to increase anthocyanins and carotenoids content.

Heat Unit Establishment as Harvest Criteria on “Mas Kirana” Banana at Various Times of Anthesis Muhammad Syaifuddin Abdurrohim; Winarso Drajat Widodo; Ketty Suketi
Journal of Tropical Crop Science Vol. 5 No. 2 (2018): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

The method for determining the appropriate time to harvest banana could affect the shelf life and quality of banana fruits during storage. The objectives of this study were to establish the heat unit as harvesting criteria of banana “Mas Kirana” and to evaluate how heat unit affects fruit shelf life and postharvest maturity characteristics. The research was conducted at PTPN VIII Parakansalak Plantation, Sukabumi, West Java, Indonesia, in November 2017 to February 2018. Laboratory analysis was conducted in Postharvest Laboratory, Department of Agronomy and Horticulture IPB in February to April 2018. The experiment was organized in a completely randomized design with a single factor of eight different flower tagging times after anthesis. Each treatment was replicated five times totaling 40 experimental units. The results showed that the different times of anthesis did not affect fruit size, weight per hand, number of fruits per hand and weight per fruit. Different time of anthesis did not affect respiration rate, fruit shelf life, physical and chemical quality. The minimum heat unit of 650ºC degree days can be used as harvesting criteria for banana “Mas Kirana”. The number of day after anthesis was 39 to 43 with fruit shelf life of 12 to 16 days.

Effects of Pruning, Branch Bending, and Biofertilizer Application on Flowering and Fruiting of Guava “Crystal” Natalia, Cristina Evi; Susanto, Slamet; Suketi, Ketty; Hapsari, Dhika Prita
Journal of Tropical Crop Science Vol. 12 No. 01 (2025): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.12.01.185-194

Guava “Crystal” is one of Indonesia’s most popular varieties; its demand continues to increase, so it is important to examine methods to increase fruit production. This research aims to increase the flowering and fruiting of guava “Crystal” through branch-bending and application of biofertilizer. The results showed that pruning + bending significantly increased the number of shoots by 15.8%, shoot length by 11.16%, and leaf number by 15.09%. This treatment also increased flower number by 88.84%, fruit number by 77.9%, and double the fruit weight. Biofertilizers significantly increased vegetative growth in the form of the number of shoots (5.12%), shoot length (9.21%), and number of leaves (10.29%). Pruning + bending and biofertilizer did not significantly affect weight per fruit, fruit diameter, fruit volume, fruit firmness, total soluble solids, total titratable acids, and vitamin C content.

Phenological Study of Flowering and Fruiting in Banana “Rejang” (Musa acuminata Colla) Asmah, Nur; Widodo, Winarso Drajad; Suketi, Ketty
Journal of Tropical Crop Science Vol. 12 No. 02 (2025): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.12.02.451-461

Banana “Rejang” originates from Rejang Lebong Regency in Bengkulu Province, Sumatra, at elevations ranging from 600 to 700 meters above sea level. Banana “Rejang” is known for its sweet taste, high fibre in the pseudo stems, resistance to Fusarium spp., with slender and long fruits, and tapering fruit tips. This study aims to examine the phenological patterns of Rejang bananas and establish appropriate harvest criteria using the heat unit method. A descriptive research design was employed to illustrate the phenological development during the generative phase without external treatments. A total of 25 Rejang banana plants were observed and measured, spanning the developmental stages from flag leaf emergence to flowering and fruiting. Data were collected daily at 7:00 a.m., 10:00 a.m., 1:00 p.m., and 4:00 p.m. The average daily temperature was recorded to calculate heat units in degrees Celsius (°C). Phenological development begins with the emergence of the flag leaf at 102 days after planting, corresponding to an accumulated heat unit of 1,800-degree days. Flower initiation occurs at 134 days after planting, with 2,330-degree days accumulated as heat units. The period from flower initiation to anthesis lasts approximately 4 days, followed by a period of 4 days after anthesis (DAA). Bract opening occurs 3 DAA, followed by bract rolling at 7 DAA and banana heart emergence at 10 DAA. The bunch stalk forms 7 days after anthesis, after the banana heart emerges. Fertilization occurs 165 days after planting (DAP), with a total heat unit accumulation of 2,833 degree-days. This stage involves the formation of the bunch stalk and the emergence of the fruit cluster, which occurs 5 DAA. The rachis appears at 5 days after anthesis, and fruit development is reached at 12 DAA after rachis emergence. The optimal harvest.

Chili Yields, Nutrient Use, and Water Use Efficiency under Precision Fertigation at Different Plant Density and Drip Irrigation Lines Susila, Anas Dinurrohman; Suketi, Ketty; Purnamawati, Heni; Rusdan, Risna
Journal of Tropical Crop Science Vol. 12 No. 03 (2025): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.12.03.594-603

The study aimed to evaluate the effects of irrigation line number and plant density on the growth and yield of curly red chili pepper (Capsicum annuum L.) cv. Tangguh. The study was conducted from August 2023 to January 2024 at the Cikarawang Experimental Station of IPB University (6°32’56” S; 106°43’54” E; 240 m above sea level) on Ultisol characterized by severely low phosphorus (1.1 ppm) and high potassium content (66 ppm). A split-plot design within a randomized complete block design was employed, with irrigation line number (single or double drip lines per bed) as the main plot and four planting densities (26,666, 53,322, 80,000, and 106,666 plants.ha-1) as subplots. Each treatment was replicated three times, resulting in 24 plots (each 1.5 m × 10 m). Fertilizers applied included Urea (45% N), SP-36 (36% P2O5 ), cattle manure, dolomite, biofertilizers (Trichoderma spp.), and PGPR. Irrigation and fertigation were managed using the Nutrigads automatic drip system. The data collected included plant growth, yield components, nutrient use efficiency, water use efficiency, and partial factor productivity for nitrogen (N) and phosphorus (P). The results showed that the irrigation line number had no significant effect on individual plant growth parameters. However, using double lines significantly increased total fruit yield per bed and hectare, indicating its contribution to overall productivity. Conversely, the double line system reduced water use efficiency (WUE = 2.07 kg.mm-1) compared to the single line system (WUE = 3.64 kg.mm-1; P<0.0001). Higher planting densities (up to 106,666 plants.ha-1) enhanced total yield by promoting vertical growth but reduced individual plant performance, and had a positive effect on WUE, NUE, and PUE.

Co-Authors , Mukhlas Abdullah Bin Arif Aidil Fitriansyah Alveno, Vitho Anas Dinurrohman Susila Ani Kurniawati Arista, Mei Lianti Awang Maharijaya Azzuhdy, Muhammad Zakiyuddin Siroj betty betty Betty Tjhia Cenra Intan Hartuti Tuharea Chandi Tri Akbar DADANG DADANG Deli, Syekh Zulfadli Arofah Dhika Prita Hapsari Dian Pratanda Rizki Didy Sopandie Efendi, Darda Elke Camelia Halim Faqih Udin Farah Maulida Febjislami, Shalati Fidianinta , Fitria Andini Hamdani, Kiki Kusyaeri Imanda, Nandya Jamaluddin, Moh Agus Jian Ayu Pratiwi Juang G. Kartika Juang Gema Kartika Krisantini Krisantini , Krisantini Lestari, Mutiara Dwi Lia Rachmawati M. Luthfan Taris Mathias Pratama Mei Lianti Arista Moh Agus Jamaluddin Mohamad Rahmad Suhartanto Muhamad Noor Azizu, Muhamad Noor Muhamad Syukur Muhammad Syaifuddin Abdurrohim Mukdisari, Yurisqi Mustika Dwi Rahayu Muthi’ah Khairun Nisa Nadiyah Mawaddah Ayuningtyas Nandya Imanda Nasib, Samson Bin Natalia, Cristina Evi Neni Musyarofah Nian Rimayanti H. Nicha Muslimawati Nidya Putri Zulia Kusuma Wardani Nilam Mayasari Nur Asmah, Nur Nurkholis Nurkholis Purwono Purwono, Purwono Putra, Bagas Akmala Rahardjo, Rizky RAHMI YUNIANTI Rahmi Yunianti Rasmani, Rasmani Riana Jumawati Risna rusdan Rizki, Dian Pratanda Rizky Rahardjo Roedhy Poerwanto Samson Bin Nasib Sandra Arifin Aziz Septy Yurihastuti Setyadjit Shalati Febjislami Slamet Susanto Sobir Sobir Sriani Sujiprihati SRIANI SUJIPRIHATI Suryo Wiyono Susanti, Lea Susanto, Renaldy Tanari, Yulinda Turi Handayani Winarso D. Widodo Winarso Drajat Widodo Yurihastuti, Septy Yusnita Sari

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