scholarly journals Impact of fast and slow desiccation on Garcinia imberti seed and seedling vigour

2018 ◽  
Vol 5 (3) ◽  
pp. 95-102
Author(s):  
M Anto ◽  
C Anilkumar
Keyword(s):  
Moisture Content ◽  
Initial Moisture Content ◽  
Germplasm Conservation ◽  
Seedling Vigour ◽  
Critical Moisture Content ◽  
Normal Seedling ◽  
Southern Western Ghats ◽  
Mean Germination Time ◽  
Critical Moisture ◽  
Activated Silica Gel

Garcinia imberti Bourd. endemic to the southern Western Ghats is classified as endangered by the IUCN (2018). The seeds as the sole means of propagation with initial moisture content (MC) of 62.8% are sensitive to desiccation. Studies on the responses of the seed to drying require ascertaining of the critical moisture content (CMC) as a basic requisite for germplasm conservation. Responses of G. imberti seeds to fast drying with activated silica gel (25 ± 2 °C, 6 ± 1% RH) and to slow drying under laboratory conditions (28 ± 2°C, 60 ± 2% RH) were evaluated for seed and seedling vigour. When the MC was reduced to 56% by 48 hours of slow drying or 6 hours of fast drying, 75 to 90% normal seedlings were produced respectively. In the case of fast dried seed (6 hours), seed associated parameters except mean germination time showed peak values with maximum germination and enhanced root length. Below the CMCs of 16.4 and 26.3% (fast and slow drying respectively), half of the tested seeds become non viable. Thus for germplasm conservation the present study proposes 6 hour’s of fast drying to retain viability and normal seedling development of G. imberti.

scholarly journals Pendugaan Umur Simpan Benih Padi (Oryza sativa L) Menggunakan Metode ASLT (Accelerated Shelf Life Testing) dengan Pendekatan Model Kadar Air Kritis

2019 ◽  
Vol 7 (2) ◽  
pp. 228
Author(s):  
I Putu Mas Pradnyana Wibawa ◽  
Ida Bagus Putu Gunadnya ◽  
I Made Anom Sutrisna Wijaya
Keyword(s):  
Moisture Content ◽  
Shelf Life ◽  
Oryza Sativa L ◽  
Initial Moisture Content ◽  
Total Solid ◽  
Rice Seed ◽  
Life Testing ◽  
Critical Moisture Content ◽  
Critical Moisture ◽  
Rice Seeds

Tujuan dari dilakukanya penelitian Ini adalah untuk menduga umur simpan benih padi menggunakan metode ASLT (Accelerrated Shelf Life Testing) dengan pendekatan model kadar air kritis. Adapun benih yang digunakan adalah benih varietas Ciherang dan varietas Inpari 30. Kemasan dari benih padi adalah plastic jenis Polipropilen (PP). Benih padi disimpan pada kondisi lingkungan (suhu 290C dan RH 75%). Pengamatan benih dianggap kritis ketika persentase daya berkecambah di bawah 80%. Ditemukan dari hasil pengukuran bahwa nilai permeabilitas kemasan (k/x) dari plastic PP adalah 0,013 gH2O/m2.day.mmHg. Pengamtan kadar air awal (Ma) adalah 13 %, kadar air kritis (Mc) adalah 29 %, total padatanya (WS) adalah 8,8 kg, dan perbedaan tekanan (?P) 1,15 mmHg. Sementara Inpari 30 memiliki nilai kadar air awal (Ma) 14%, kadar air kritis 29%, total padatannya (WS) 8,7 kg, dan ?P 0,9 mmHg.  Dari nilai tersebut dapat diduga umur simpan dua varietas benih bersertifikat yang dikemas dalam plastik PP dan disimpan pada suhu 29oC dan RH 75% adalah 156 hari (5,03 bulan) untuk varietas Ciherang dan 254 hari (8,19 bulan)  untuk 30 varietas Inpari.   The purpose of this study was to prediction the shelf life of certified rice seeds using the ASLT (Accelerated Shelf Life Testing) method based on the critical moisture content approach. The varieties of rice seeds used in this research were Ciherang and Inpari 30 varieties which packed with polypropylene (PP) plastic packaging. The rice seeds packages were stored at environmental condition (temperature of 29oC and RH of 75%). Observation on seeds germination was done daily until the seeds have a germination percentage below 80%. When the seeds under this condition, moisture content of the seeds was measured and refer as critical moisture content. It was found that the packaging permeability (k/x) of PP plastic was 0.013 g H2O/m2.day.mmHg. Observation on rice seed of Ciherang variety revealed that its values of initial moisture content (Ma) was 0.133 %, its critical moisture content (Mc) was 0.291 %, its total solid (Ws) was 8.8 kg, and pressure difference  (?P) was 1,15 mmHg. While, for Invary 30 variety the values of its shelf life parameters were as follows: Ma 0.144 %, Mc 0.293 %, Ws 8.7 kg, and ?P 0.9 mmHg. The prediction of shelf life the two certified rice seeds which were packed in PP plastic and stored at 29oC and RH of 75% were 156 days (5.03 months) for Ciherang variety and 254 days (8.19 months). ) for Inpari 30 variety.

scholarly journals PENDUGAAN UMUR SIMPAN GULA SEMUT DALAM KEMASAN DENGAN PENDEKATAN ARRHENIUS (Shelf Life Prediction of Palm Sugar on Packaging using Arrhenius Equation)

2018 ◽  
Vol 6 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Hary Kurniawan ◽  
Nursigit Bintoro ◽  
Joko Nugroho W.K.
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Shelf Life ◽  
Initial Moisture Content ◽  
Storage Period ◽  
Critical Parameters ◽  
Arrhenius Model ◽  
Critical Moisture Content ◽  
Palm Sugar ◽  
Critical Moisture

The purpose of this research was to determined the shelf life of packaged palm sugar at various temperatures and relative humidity (RH) storage using Arrhenius model based on changes in water content. The palm sugars were packed with 0.675 mm polyethylene packaging and stored at 15, 25, 30 and 35°C at RH of 77% and 98%. Measured parameters included the determination of critical parameters of palm sugar, initial moisture content and critical moisture content of palm sugar, changes in moisture content during storage. The Arrhenius model approach was used in this study to predict the shelf life period of palm sugar. The results showed that the texture was one of palm sugar critical parameters. Initial moisture content and critical moisture content of palm sugar were obtained at 1.51% (db) and 6.80% (db), respectively. Increase in moisture content of palm sugar occurred in various temperature variations and RH storage. The higher the storage temperature, the higher the moisture content of the palm sugar, which was characterized by the greater slope of moisture content relationship graph with respect to storage period at both RH 77% and 98%. The longest duration of palm sugar occurredat 15°C, RH 77%; the shortest duration occurred at 35°C, RH 98%. Keywords: palm sugar, packaging, relative humidity, temperature, shelf life   ABSTRAK Tujuan dari penelitian in adalah menentukan umur simpan gula semut dalam kemasan pada berbagai suhu dan RH penyimpanan mengunakan model Arrhenius berdasarkan perubahan kadar air. Gula semut dikemas menggunakan kemasan polietilen ketabalan 0,675 mm dan disimpan pada suhu 15, 25, 30 dan 35oC pada RH 77% dan 98%. Parameter yang diukur antara lain penetuan parameter kritis gula semut, kadar air awal dan kadar air kritis gula semut, perubahan kadar air selama penyimpanan. Pendekatan model Arrhenius digunakan dalam penelitan ini untuk memprediksi umur simpan gula semut. Hasil menunjukkan bahwa tekstur merupakan salah satu parameter kritis gula semut. Kadar air awal dan kadar air kritis gula semut diperoleh masing-masing 1,51 % (db) dan 6,80% (db). Terjadi peningkatan kadar air gula semut pada berbagai variasi suhu dan RH penyimpanan. Semakin tinggi suhu penyimpanan maka kenaiakn kadar air gula semut semakin besar yang ditandai dengan semakin besar kemiringan grafik hubungan kadar air terhadap waktu penyimpanan baik pada RH 77% dan 98%. Umur simpan gula semut paling lama terjadi pada suhu 15oC RH 77% dan umur simpan gula semut yang paling pendek terjadi pada suhu 35oC RH 98%.     Kata kunci: gula semut, kelembaban relatif, kemasan, temperatur, umur simpan

scholarly journals The Drying Rate of Chlorella pyrenoidosa Using an Oven in Bioethanol Production

2021 ◽  
Vol 80 (1) ◽  
pp. 128-136
Author(s):  
Megawati ◽  
Astrilia Damayanti ◽  
Putri Radenrara D. A. ◽  
Pradnya Irene N. ◽  
Khusnul Hotimah ◽  
...  
Keyword(s):  
Moisture Content ◽  
Total Energy ◽  
Initial Moisture Content ◽  
Dry Weight ◽  
Chlorella Pyrenoidosa ◽  
Drying Rate ◽  
Bioethanol Production ◽  
Rate Model ◽  
Critical Moisture Content ◽  
Critical Moisture

The production of bioethanol from microalgae goes through several stages, including cultivation, harvesting, drying, storage, and conversion to bioethanol. Nearly 40% of the total energy consumed in the bioethanol production from microalgae is from drying. This research aims to study the drying rate model of Chlorella pyrenoidosa using an oven. The drying is carried out at the temperatures of 50, 60, and 70 oC. The initial moisture content of Chlorella pyrenoidosa was 317.798% dry weight. The results showed that at the temperatures of 50, 60, and 70 oC, the critical moisture content was 9.108, 7.583, and 6.93% dry weight, while the equilibrium moisture content was 3.172, 3.158, and 3.109% dry weight. The most optimal drying is at 70 oC and the drying rate gets faster as the temperature does too. The Page model is better at describing the drying rate of Chlorella pyrenoidosa using an oven than the Newton model. The drying speed constants (k) were 0.00056, 0.00061, and 0.00208, at 50, 60, and 70 oC, respectively.

Study on Critical Moisture Content of Unsaturated Evaporation

2014 ◽  
Vol 513-517 ◽  
pp. 2643-2646
Author(s):  
Hua Zhang ◽  
Wen Long Hu ◽  
Jin Lu Cao
Keyword(s):  
Moisture Content ◽  
Thin Layer ◽  
Measuring System ◽  
Evaporation Process ◽  
Critical Moisture Content ◽  
Whole Process ◽  
Critical Moisture ◽  
Three Stages ◽  
Soil Water Characteristic Curves ◽  
Water Contents

Thin layer evaporation tests of three types of soil were conducted by a newly designed humidity-controllable evaporation and penetration measuring system and lasted for 8 days. The whole process of sample mass variation from wet to dry was recorded in the laboratory. The critical moisture content and air-dried moisture content were obtained from evaporation curve, which divided the evaporation process of thin layer unsaturated soil into three stages, including stable rate stage, reducing rate stage and residual stage. The soil water characteristic curves of soils were predicted by Arya and Paris model, the results showed that the critical moisture contents of evaporation process were the same with the water contents corresponding to residue values of SWCC, it is significant to studying on unsaturated evaporation process.

Experimental Study of Static Disintegration on Unsaturated Soil

2014 ◽  
Vol 580-583 ◽  
pp. 68-72 ◽  
Author(s):  
Nian Qin Wang ◽  
Qing Tao Wang ◽  
Qian Xue ◽  
Xiao Ling Liu
Keyword(s):  
Experimental Study ◽  
Moisture Content ◽  
Unsaturated Soil ◽  
Initial Moisture Content ◽  
Effective Porosity ◽  
Disintegration Rate ◽  
Porosity Ratio ◽  
Water Rate ◽  
Critical Moisture ◽  
Relationship Of

In order to explore the disintegration characteristics of compacted loess, through the unsaturated soil disintegration instrument by independently developed,conduct the soaking disintegration experimental study on remolded soil unsaturated samples,obtained a series of experimental results:①The curves can be divided into the slow disintegration, rapid disintegration and stabilization of disintegration in three stages，the degree of compaction and water rate impact on rapidly disintegrating stage;②When the degree of compaction is certain,the disintegration rate decreased with the water contented increasing,the decreased amplitude is increasing with the moisture content increased to18%,the disintegration characteristics disappeared with the moisture content increased to 22%;③When the initial moisture content is certain, the disintegration rate decreased with the degree of compaction increasing, The time significantly prolonged when the disintegration completed. the decreased amplitude is increasing with the degree of compaction increased to 95%,the disintegration characteristics basically disappeared. Based on the relationship of degree of compaction and the moisture content to void ratio, the thesis establishes the model between the disintegration rate and the effective porosity ratio,the formula can be used to calculate the disintegration rate of compacted loess.The specific conclusions are:①When the critical moisture content increased to 22%,the disintegration characteristics disappeared;②When the critical degree of compaction increased to95%，the disintegration characteristics also disappeared.

scholarly journals Testing methods of moisture content, critical moisture content, and germination of jamblang (Syzygium cumini (L.) Skeels) seed

2019 ◽  
Vol 8 (1) ◽  
pp. 47
Author(s):  
Miraz Nur Indraeni ◽  
Faiza Chairani Suwarno ◽  
Abdul - Qadir
Keyword(s):  
Seed Germination ◽  
Moisture Content ◽  
Seed Quality ◽  
Block Design ◽  
Syzygium Cumini ◽  
Critical Moisture Content ◽  
Testing Method ◽  
Randomized Complete Block Design ◽  
Final Count ◽  
Critical Moisture

Jamblang (Syzygium cumini (L.) Skeels) researches are still focused to identify the plant benefits, but that leads to efforts to obtain good seed quality hasn’t been done. This study aims to determine the moisture content testing method, the critical moisture content, and germination testing method (sowing media and first and final count of seed germination). Improving procedure for moisture content testing and identified the best media for germination testing was arranged in a Completely Random Design.  Determining jamblang seeds critical moisture content was arranged in a Randomized Complete Block Design. The experiments were repeated four times. Moisture content with slicing method obtained 49.57%. Jamblang seeds critical water content is 41.61% with 50% germination. The best method of germination was sand medium with fresh seeds (90%). The first count of jamblang seed germination occurs on 32 days after sowing and final count on 83 days after sowing.

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