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All Journal Vegetalika Jurnal Ilmu Pertanian Jurnal Ilmu-Ilmu Pertanian Indonesia jurnal Ilmu Pertanian (Agricultural Science)
Susila Putra, Eka Tarwaca
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Agriculture, Biological Sciences & Forestry

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Anatomical responses of roots and yield of cocoa (Theobroma cacao L.) to K fertilization doses Shodiq, Muhammad Syaiful; Susila Putra, Eka Tarwaca; Rofiqo Irwan, Siti Nurul
Jurnal Ilmu Pertanian Vol 9, No 2 (2024): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.76188

Abstract

Cocoa is one of important commodities for the economy of Indonesia. However, national exports of the commodity has declined due to decreasing of domestic cocoa production. For enhancing cocoa production, potassium fertilization is required. Potassium (K) is an essential macronutrient in the physiology, anatomy, and yields processes. Anatomically, K is needed in the elongation of meristem tissue as well as for increasing the yields of fruit and seed. The objectives of this research included the study of the effect of K fertilizer dose and determination of optimum K doses on root anatomy development as well as the yield of cocoa pods. This research was conducted on the cocoa plantation of PT. Pagilaran. Applied doses of K fertilization consisted of 0, 150, 300, 450, and 600 g KCl/plant in Randomized Complete Block Design (RCBD) with 5 replications. Observed variables consisted of root anatomy and yield of cocoa pods. The results indicated that the dose of K fertilization significantly influenced both stele and xylem diameters of cocoa roots but insignificantly effected the thickness of cork tissue, phloem diameter, and the thickness of cambium tissue. Moreover, the dose also showed significant effect on the number of beans per pod, the weight of 100 beans, as well as the fresh and dry weight of beans per plant. It was also revealed that the dose showed no significant effect on length, diameter, and weight of the cocoa pods. It implied that K fertilization dose had effect on root anatomical properties and yield of cacao. 
A TANGGAPAN FISIOLOGIS DAN HASIL EMPAT KULTIVAR PADI GOGO LOKAL SULAWESI TENGAH TERHADAP CEKAMAN KEKERINGAN Boy, Ruslan; Indra Dewa, Didik; Susila Putra, Eka Tarwaca; Kurniasih, Budiastuti
Jurnal Ilmu-Ilmu Pertanian Indonesia Vol 24 No 2 (2022)
Publisher : BPFP Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jipi.24.2.132-144

Abstract

[PHYSIOLOGICAL RESPONSES AND YIELDS OF FOUR LOCAL GOGO RICE CULTIVARS OF CENTRAL SULAWESI TO DROUGHT STRESS]. Rice is the most important staple food for Indonesians and can be grown in dry land agroecosystems as an upland rice. The research was conducted to study the physiological mechanisms related to drought resistant schemes on four local upland rice cultivars of Central Sulawesi. Field research was carried out using factorial Completely Randomized Block Design (CRBD) with two factors and three blocks as replication. The first factor was four cultivars of upland rice, i.e., Habo, Hiwanggu, Sunggul, and Lambara; while watering intervals of once in one, two, four and eight days was considered as second factor. The observed variables of this experiment were soil moisture, relative water content of leaf, stomatal conductance, concentration of leaf carbon dioxide, transpiration rate, photosynthesis rate, and yield of grain per grove. The collected data were analyzed with regression using independent variables of soil moisture and dependent variables of relative water content on leaf, stomatal conductance, concentration of carbon dioxide on leaf, transpiration rate, photosynthesis rate and yield of grain per grove. The relationship among observed variables was determined using correlation analysis. The results showed that drought resistant upland rice cultivars (Habo and Sunggul) required less optimum soil moisture than those of non-drought resistant cultivars (Hiwanggu and Lambara) to maximize relative water content, stomatal conductance, carbon dioxide, transpiration rate and photosynthesis rate. Soil moisture contributions to maximum yield of grain per grove on Habo, Sunggul, Hiwanggu and Lambara cultivars were 23.41%, 23.00%, 27.14% and 26.67%, respectively.  
Pengaruh Posisi Cabang Pembuahan terhadap Pertumbuhan, Hasil, dan Mutu Buah Melon (Cucumis melo L.) dalam Sistem Fertigasi Hidroponik Ikhwana, Muhammad Habib; Susila Putra, Eka Tarwaca; Ambarwati, Erlina
Vegetalika Vol 14, No 3 (2025): In Publish
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/veg.104670

Abstract

Melon have the potential to produce 10-20 fruits per plant; however, the quality of each fruit is often suboptimal due to inefficient assimilate distribution. This study aimed to determine the optimal fruiting branch position to maximize the growth, yield, and quality of melons in a fertigation hydroponic system. The research was conducted in a 168 m² greenhouse owned by PT Lentera Agropedia Nusantara, located in Pripih, Hargomulyo, Kulon Progo, Special Region of Yogyakarta, Indonesia. A split-plot experimental design was used, with melon cultivars (Sweet Hami and Kirin) as the main factor and fruiting branch positions (lower, middle, and upper) as the sub-factor. The results showed that middle (9th to 10th nodes) and upper (11th to 12th nodes) fruiting branches exhibited greater fruit weight, length, and diameter compared to lower branches (7th to 8th nodes). Kirin cultivar had thicker flesh, and the interaction between cultivar and branch position significantly influenced the fruit cavity diameter. Middle and upper branches produced fruits of similar quality when harvested at 70 days after planting. Fruiting on the lower branches (7th to 8th nodes) produces fruits with lower weight, length, and diameter.Considering the risks associated with fruiting on upper branches, it is recommended to maintain melons on middle branches, specifically at the 9th to 10th nodes.
Agroclimatic characteristics, nutrient uptake, morphology, and yield of abaca plants (Musa textilis nee) which managed agroforestry in Ngawi Najibunniam, Arly; Susila Putra, Eka Tarwaca; Kurniasih, Budiastuti
Jurnal Ilmu Pertanian Vol 10, No 2 (2025): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.104864

Abstract

This research aimed to measure microclimate characteristics,  evaluate abaca plants nutrient uptake, morphology and yield, and determine the optimal microclimate characteristics on abaca cultivation land managed using teak-based agroforestry in the middle and advanced phases in Ngawi. The research was arranged in a nested design. The parameters observed include agroclimatic characteristics, nutrient uptake, physiology and morphology, as well as yield of abaca plants. The middle phase of abaca-teak agroforestry shows higher humidity and lower temperatures than the advanced phase with a difference of 3% and 1.57ºC, respectively. This is because microclimate in the middle phase is more suitable due to the multistrata canopy structure and greater plant diversity. The absorption all of macro and micro nutrients in the middle phase was better than in the advanced phase, indicating that abaca in the middle phase had more nutrient uptake. The morphological traits of abaca in the middle phase were better and significantly different compared to those in the advanced phase, with the differences in plant height variables of 110.11 cm, apparent stem circumference of 7.99 cm, and number of suckers of 5. Furthermore, in terms of yield characteristics, all variables showed that abaca planted in the middle phase was better than the advanced phase, it can be seen the respective differences in the number of banana fronds is 4 blade, the weight of banana fronds is 2.95 kg/plant, the fresh weight of fiber is 353.66 g/plant, and the weight of dry fiber is 120.67 g/plant.
Agroclimatic characteristics, nutrient uptake, morphology, and yield of abaca plants (Musa textilis nee) which managed agroforestry in Ngawi Najibunniam, Arly; Susila Putra, Eka Tarwaca; Kurniasih, Budiastuti
Jurnal Ilmu Pertanian Vol 10, No 2 (2025): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.104864

Abstract

This research aimed to measure microclimate characteristics,  evaluate abaca plants nutrient uptake, morphology and yield, and determine the optimal microclimate characteristics on abaca cultivation land managed using teak-based agroforestry in the middle and advanced phases in Ngawi. The research was arranged in a nested design. The parameters observed include agroclimatic characteristics, nutrient uptake, physiology and morphology, as well as yield of abaca plants. The middle phase of abaca-teak agroforestry shows higher humidity and lower temperatures than the advanced phase with a difference of 3% and 1.57ºC, respectively. This is because microclimate in the middle phase is more suitable due to the multistrata canopy structure and greater plant diversity. The absorption all of macro and micro nutrients in the middle phase was better than in the advanced phase, indicating that abaca in the middle phase had more nutrient uptake. The morphological traits of abaca in the middle phase were better and significantly different compared to those in the advanced phase, with the differences in plant height variables of 110.11 cm, apparent stem circumference of 7.99 cm, and number of suckers of 5. Furthermore, in terms of yield characteristics, all variables showed that abaca planted in the middle phase was better than the advanced phase, it can be seen the respective differences in the number of banana fronds is 4 blade, the weight of banana fronds is 2.95 kg/plant, the fresh weight of fiber is 353.66 g/plant, and the weight of dry fiber is 120.67 g/plant.
Co-Authors Erlina Ambarwati Ikhwana, Muhammad Habib Indra Dewa, Didik Kurniasih, Budiastuti Muhammad Syaiful Shodiq Najibunniam, Arly Ruslan Boy Siti Nurul Rofiqo Irwan