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TAKAHISA MATSUOKA

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Author-ID : 317937

Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Economics, Econometrics & Finance

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Articles

Application of Deep Sea Water for Multi-Trusses Cultivation of Tomato Using A Nutrient Film Technique YUDI CHADIRIN; TAKAHISA MATSUOKA; HERRY SUHARDIYANTO
HAYATI Journal of Biosciences Vol. 15 No. 2 (2008): June 2008
Publisher : Bogor Agricultural University, Indonesia

Deep sea water (DSW) that was applied to 3 trusses of cultivated tomato for 2 weeks affected fruits properties. However, advantageous effects on the soluble solids content, acidity, and dry matter content of the fruit tend to decline from 1st truss to the successive trusses. Thus it is necessary to study the effect of DSW application when it is applied for longer than 2 weeks in cultivated multi-trusses. In this study, DSW treatment was applied for different durations to obtain effect on fruits development and fruit properties of the 1st to 3rd truss in a 3 truss tomato cultivation system using a nutrient film technique. The results of the study show that DSW treatment has strong effect on fruit enlargement during the stage of rapid fruit growth, which lasts until the fruit almost reaches the final size. Treated plants produced tomatoes with better organoleptic with higher soluble solids content and higher acidity, higher dry matter content, a thicker and more resistant cuticle and also gave higher yields (weight and no of fruits) than in single truss tomato cultivation. Key words: tomato (Lycopersicon esculentum), deep sea water, fruit development, fruit properties, multi-trusses cultivation, nutrient film technique

Application of Deep Sea Water (DSW) for Nutrient Supplement in Hydroponics Cultivation of Tomato : Effect of supplemented DSW at Different EC Levels on Fruit Properties Yudi Chadirin; Takahisa Matsuoka; Herry Suhardiyanto; Anas D. Susila
Indonesian Journal of Agronomy Vol. 35 No. 2 (2007): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Deep sea water (DSW) has the potential characteristics for nutrient supplement in hydroponics cultivation. This experiment was carried out to evaluate the application of DSW as a nutrient supplement for tomato cultivation in hydroponics system. Tomatoes were grown on 4 beds in nutrient film technique (NFT) system circulated with 1.5 dS m-1(control), 10 dS m-1 15 dS m-1 and 20 dS m-1 of nutrient solution, respectively. DSW was supplemented into nutrient solution of control to obtain high EC level. Fresh weight of fruits decreased varied from 10-20% by increasing DSW concentration in nutrient solution, but the effect of the treatment was not found on size of 3rd truss fruits. The density of fruits increased as the DSW concentration increased in nutrient solution. Tomato stiffness of treated plants had almost the same value among EC levels although different among 3 trusses. Fruit quality parameters increased by increasing the DSW concentration in nutrient solution. Treated plants circulated with EC 20 dS m-1 supplemented nutrient solution for 2 weeks produced tomatoes with highest soluble solids, 8.0% Brix or increased 30% of control (1st truss). However there were no significant effect on fruits of 2nd and 3rd trusses. DSW could be used as nutrient supplement for hydroponics cultivation of tomato. Key words : Deep sea water, fruit quality, electrical conductivity, tomato

Developing A Calibration Moel of Leaf Water Potensial Determination in Tomato Plants Using Nir Spectroscopy with Temperature Compensation Diding Suhandy; Takahisa Matsuoka
Jurnal Keteknikan Pertanian Vol. 22 No. 1 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.022.1.%p

In this study a calibration model with temperature compensation for leaf water potential (LWP) determination in tomato plants was successfully developed. A number of 150 tomato plants (Lycopersicon esculentum ev. Momotaro T-93) were used as samples. The plants were cultivated under same EC level (0.8 dSm-1) in Deep Flow Technique (OFT) using Wagner's pot. For each leaf, the uon-plant" six spectral acquisitions from six positions were conducted. The measuring condition for spectral acquisitions was 10 ms for scanning time and 50 scans for averaging. Immediately after the lion plant" spectral acquisition, leaf was cut and its LWP value was measured using the pressure chamber method. The Partial Least Squares (PLS) Regression was used to develop a calibration model. The result showed that the best calibration model with temperature compensation was identified for the original spectra in the wavelength range of 700-1040 nm. This calibration model had R2 =0.83, SEC =0.091 and SEP =0.120. This calibration model resulted in low SEP and bias for prediction ofLWP for samples having temperature 15, 25 and 35°C. This study has shown the superiority of using calibration model with temperature compensation to that without temperature compensation. This result opened the possibility ofusing NIR spectroscopy as a tool for nondestructive on-plant LWP determination on the field. Keywords: calibration model, temperature compensation, leaf water potential, pressure chamber method, on-plant spectral acquisition, on-plant LWP determination Diterima: 10 Mei 2007; Disetujui: 15 Agustus 2007

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