Abstract. In tropical country likes in Indonesia, potato seeds that originated from temperate zone can only be produced in low temperature of highland. Besides this way has many limitation of productivity, it often causes soil erosion. To minimize environment destroying risk tuber seed production in lowland is a challenge. This research was done to trace that modified root zone cooling method of aerophonic system can be applied to produce high quality of tuber seeds in lowland. The First Generations (G0) of var. Atlantic and var. Granola were used as plant materials, and randomized block design (RBD) with four replications was applied in this research. Data regarding with vegetative as well as tuber production parameters were analyzed using Coefficient of variance (ANOVA) and continued with the least significant difference test (LSD; p = 5%). The results showed that aerophonic generated seeds (G0) had vigorous growth and could produce the normal G1. In term of tuber yield component and number of leaves var. Atlantic showed higher than var. Granola did. The comparison of seed weight between G0 and G1 was about 10 grams and 54 g on average, respectively. Since the size and weight of such G1 could be categorized as Large (L) in term of commercial seed market, It’s implied that the lowland modified aerophonic system could be nominated as a prospective method for producing G0 tuber seed in the future. Potensi Bibit G0 Dari Bibit Kentang Aeroponik Di Dataran Rendah Dengan Akar Zona Pendingin Menjadi G1 Di Dataran Tinggi Abstrak. Di negara tropis seperti di Indonesia, bibit kentang yang berasal dari zona sedang hanya dapat diproduksi pada suhu rendah di dataran tinggi. Selain itu cara ini memiliki banyak keterbatasan produktivitas dan sering menyebabkan erosi tanah. Meminimalkan resiko dampak kerusakan lingkungan akibat produksi benih umbi di dataran rendah adalah sebuah tantangan. Penelitian ini dilakukan untuk mengkaji bahwa metode zona akar pendingin sistem aeroponik dapat diterapkan untuk menghasilkan benih umbi kentang kualitas tinggi di dataran rendah. Generasi Pertama (G0) dari var. Atlantik dan var. Granola digunakan sebagai bahan penelitian, dan rancangan acak kelompok dengan empat ulangan digunakan dalam penelitian ini. Data mengenai vegetatif serta parameter produksi umbi dianalisis menggunakan Koefisien varians (ANOVA) dan dilanjutkan dengan uji BNT (LSD; p = 5%). Hasil penelitian menunjukkan bahwa aeroponik biji yang dihasilkan (G0) memiliki pertumbuhan yang kuat dan bisa menghasilkan G1 yang normal. Dari segi produktivitas dan jumlah daun, var. Atlantic menghasilkan produktivitas yang lebih tinggi serta jumlah daun yang lebih banyak dibandingkan var. Granola. Perbandingan berat biji antara G0 dan G1 adalah rata-rata sekitar 10 gram dan 54 g untuk masing-masing generasi. Ukuran dan berat dari G1 tersebut dapat dikategorikan sebagai ukuran besar dan berpotensi komersial untuk dipasarkan. Dari hasil penelitian yang telah dilakukan, dapat disimpulkan bahwa sistem aeroponik dataran rendah termodifikasi bisa diterapkan sebagai metode prospektif untuk memproduksi benih umbi kentang G0 di masa depan.
Aeroponic technology for wet tropical lowlands have been developed with the application root zone cooling (RZT). High temperatures in the lowlands trigger the disease. Biopesticides have been tested for red onions, tomatoes, peanuts and chili in Banyumas, but it is not known what effect, if applied to the aeroponic system with RZT in the lowlands. The research objective is to get the concentration biopestida for growth and the best results of the varieties grown in aeroponics to RZT in wet tropical lowlands. Factors to be tested: box aeroponic without RZT and biopesticides 1ml / liter (B1), box aeroponics RZT 10 °C biopesticides 4 ml / liter (B2), box aeroponics RZT 10 °C without biopesticides (B3), aeroponics box RZT 10 °C biopesticides 10 ml / liter (B4). The varieties of seed potatoes: Alantic varieties (V1), Variety Granola (V2). The study used a completely randomized design (CRD) and repeated 4 times. Analysis of data using analysis of variance followed by DMRT at the level of α = 5%. Results showed that the varieties of granola in aeroponic systemwith RZT and application of biopesticides 4 ml/ liter and 10 ml/ liter gave the highest plant height.Biopesticides 10 ml / liter on average produces the highest number of leaves, and biopesticides 4 ml / liter produces the highest number of tubers.
The function of water for plants is crucial, including playing the roles in metabolic reactions. The aims of this article are to give information on the effects of drought stress on plant morphology, physiology, and biochemistry, as well as mitigation methods in drought stress management for plant production. Plants manage drought stress using a mechanism, namely drought escape, drought avoidance and drought tolerance. Drought escape is the ability of plants to accelerate flowering or life cycle, drought avoidance is the ability of plants to reduce water loss and increase water absorption through morphological changes in the root system, drought tolerance is the plant adaptation to drought by changes in plant physiological and biochemical processes. Physiological changes that occur include closing the stomata and decreased photosynthesis. The biochemical responses include the synthesis of solute compounds as a form of osmotic adjustment in the cell called osmotic adjustment to reduce water loss from the cell. The biochemical indicators are the increased concentrations of abscisic acid (ABA), proline, and sugar (trehalose). ABA acts as a signal to stimulate stomatal closure to reduce the transpiration rate. Proline is an indicator of plants adapting to drought stress, playing a role in the osmotic adjustment of cells to retain in the cell. Trehalose is a compatible sugar acting as an osmoprotectant, it can maintain the integrity of cell membranes (water replacement) and form hydrogen bonds (water entrapment). Plants under drought stress conditions can adapt by making morphological, physiological, and biochemical responses by osmotic adjustment. These conditions need to be managed so that appropriate strategies and technologies are needed as mitigation measures.
Purwoceng sustainability is done in order to optimize its sustainable use. Therefore it is necessary to planting Purwoceng in a controlled and planned manner. Hydroponics is one of the alternative cultivation techniques for crop production without using soil, so it can be done in areas that are difficult to cultivate. Nutrient Film Technique (NFT) is one of the hydroponic techniques of water culture. The nutrients and water are administered to the plant in a circular in a shallow layer. NFT provides proper environmental control of root areas, as well as efficient water and plant nutrients. This study aims to obtain growth and development of medicinal plants Purwoceng NFT. The study was conducted from May to July 2017. The research location of Dieng Kulon at an altitude of 2.000 m asl. The Purwoceng plant was planted with NFT technique within 5 replications. The measurement results are shown in graphical. Indicators of nutritional adequacy using EC (Electrict Conductivity) and pH. EC nutrient used is 1-1.5 mS / cm for purwoceng 1-30 HST, 1.5-2 mS / cm for plants > 30 HST, pH used 5.5-6.5. The results showed that average growth of Purwoceng plants until the age of 50 HST reaches 7-9 cm. The number of branches of Purwoceng plants up to the age of 50 HST reaches 2-4 branches. The percentage of Purwoceng plants experiencing timber in the NFT system reached 40%. Therefore it is necessary to do further research how influence duration of nutrition to growth and result of Purwoceng.
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