scholarly journals Seed viability constants for Eucalyptus grandis

2007 ◽  
Vol 42 (1) ◽  
pp. 111-117
Author(s):  
Jussara Bertho Fantinatti ◽  
Roberto Usberti
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Inverse Relationship ◽  
Eucalyptus Grandis ◽  
Seed Viability ◽  
Growing Season ◽  
Seed Longevity ◽  
Aluminium Foil ◽  
Moisture Contents ◽  
Controlled Deterioration

This work aimed to analyse Eucalyptus grandis W.Hill ex Maiden seed behaviour, under controlled deterioration, and to estimate viability equation constants for the species. Seeds were harvested in the growing season of 1999, and the moisture contents were adjusted from 11.3% to a range between 1.2 and 18.1% at 25ºC. The subsamples were sealed into laminate aluminium-foil packets, for storage in incubators at 40, 50 and 65±0.5ºC. The seeds presented orthodox performance, in which the constants for predicting seed longevity of E. grandis were K E = 9.661, C W = 6.467, C H = 0.03498 and C Q = 0.0002330. The usual and inverse relationship between water content and seed longevity was also observed. The lowest moisture content limit for application of the viability equation at 65ºC was 4.9%, estimated under hygroscopic equilibrium with 23% of relative humidity in the storage environment.

scholarly journals Comparisons between two economically valuable forest species (Eucalyptus grandis and Pinus taeda) in relation to seed behaviour under controlled deterioration

2011 ◽  
Vol 35 (1) ◽  
pp. 77-84
Author(s):  
Jussara Bertho Fantinatti ◽  
Roberto Usberti
Keyword(s):  
Chemical Composition ◽  
Moisture Content ◽  
Pinus Taeda ◽  
Eucalyptus Grandis ◽  
Aluminium Foil ◽  
Forest Species ◽  
Initial Value ◽  
Moisture Contents ◽  
Controlled Deterioration ◽  
Seed Storability

The objectives of this work were to analyze seed behaviour under controlled deterioration and estimate viability equations for forest species Eucalyptus grandis and Pinus taeda. Desired moisture content levels were achieved from initial values after either rehydration over water or drying over silica gel, both at 25 ºC. Seed sub samples with 8 moisture contents each for E. grandis (1.2 to 18.1%, initial value of 11.3%) and P. taeda (1.5 to 19.5%, initial value of 12.9%) were sealed in laminate aluminium-foil packets and stored in incubators maintained at 40, 50 and 65 ºC. The seeds from these species exhibited true orthodox and sub-orthodox storage behaviour, respectively, however E. grandis showed higher seed storability, probably due to a different seed chemical composition. Lowest moisture content limits estimated for application of the viability equations at 65 ºC were 4.9 and 4.1 mc for E. grandis and P. taeda, on equilibrium with ±20% RH. The viability equation estimated quantified the response of seed longevity to storage environment well with K E = 9.661 and 8.838; C W = 6.467 and 5.981; C H = 0.03498 and 0.10340; C Q = 0.0002330 and 0.0005476, for E. grandis and P. taeda, respectively.

EFFECT OF MOISTURE CONTENT ON VIABILITY AND INFESTATION OF HULLESS TERRA OATS IN STORAGE

1979 ◽  
Vol 59 (4) ◽  
pp. 911-916 ◽  
Author(s):  
R. N. SINHA ◽  
N. D. G. WHITE ◽  
H. A. H. WALLACE ◽  
R. I. H. McKENZIE
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Mite Infestation ◽  
Tyrophagus Putrescentiae ◽  
Adsorption And Desorption ◽  
Safe Storage ◽  
Moisture Contents ◽  
Seed Moisture ◽  
Effect Of Moisture

The effects of various seed moisture contents in hulless (cv. Terra) and hulled oats (cv. Random) on susceptibility to mite infestation and on mycofloral growth and germination loss were studied at weekly intervals. Fat acidity values were determined for Terra oats only after 4 wk of storage. Moisture content-relative humidity adsorption and desorption curves were determined for Terra at 22 °C and at relative humidities of 35–100%. Terra oats, which had a higher level of Penicillium infection at 90–100% RH than Random oats, lost viability more rapidly than Random. Fat acidity values of Terra increased rapidly from 35 mg KOH/100 g of seed to 87–118 mg KOH/100 g of seed, only when seeds were stored at 90–100% RH. Terra offered a more favorable substrate for the multiplication of the mites Tyrophagus putrescentiae, Acarus farris, and Lepidoglyphus destructor than did Random. With the exception of susceptibility to mite infestation, safe storage criteria are similar for hulled and hulless oats at usual moisture contents.

scholarly journals Primed Lettuce Seeds Exhibit Increased Sensitivity to Moisture Content During Controlled Deterioration

HortScience ◽  
2007 ◽  
Vol 42 (6) ◽  
pp. 1436-1439 ◽  
Author(s):  
H.J. Hill ◽  
Jesse D. Cunningham ◽  
Kent J. Bradford ◽  
A.G. Taylor
Keyword(s):  
Moisture Content ◽  
Elevated Temperatures ◽  
Seed Viability ◽  
Seed Storage ◽  
Seed Priming ◽  
Storage Conditions ◽  
Seed Moisture Content ◽  
Moisture Contents ◽  
Lettuce Seeds ◽  
Rate Of Decline

The Ellis-Roberts seed viability equation is used to predict seed survival after storage at specified temperatures and moisture contents. Seed priming, which can break dormancy and accelerate germination, can also reduce seed storage life. Because primed seeds were not used in developing the Ellis-Roberts equation, the reciprocal nature of specific seed moisture content (MC, fresh weight basis) and temperatures that applies to nonprimed lettuce (Lactuca sativa L.) seeds may not apply to primed seeds. To determine how priming affects lettuce seeds in relation to the viability equation, an experiment was conducted using two cultivars, ‘Big Ben’ and ‘Parris Island Cos’. Seeds primed in polyethylene glycol 8000 (–1.45 MPa, 24 h at 15 °C) and nonprimed seeds were first adjusted to 6% and 9% moisture contents and then stored at 48 and 38 °C for up to 30 days, respectively. These storage conditions (6% MC and 48 °C; 9% MC and 38 °C) were predicted by the viability equation to result in equal longevities. Subsequent viability assays at 20 °C revealed that nonprimed seeds in both storage environments exhibited similar losses in viability over time, thus validating the Ellis-Roberts equation and the use of these conditions to apply different but equal aging stress. Primed seeds of both cultivars deteriorated faster than nonprimed seeds as expected. However, primed seeds did exhibit different rates of deterioration between the storage environments. Primed seeds stored at 9% MC and 38 °C deteriorated faster than primed seeds stored at 6% MC and 48 °C. The rate of decline in probit viability percentage was three times greater in primed ‘Big Ben’ seeds stored at 9% MC and 38 °C than for those stored at 6% MC and 48 °C (–1.34 versus –0.26 probits per day, respectively). ‘Parris Island Cos’ seeds stored at 9% MC and 38 °C had twice the rate of deterioration that those stored at 6% MC and 48 °C (–1.19 and –0.49 probits per day, respectively). The results indicate that primed lettuce seeds were more sensitive to the adverse effects of higher seed MC than were nonprimed seeds during storage at elevated temperatures.

scholarly journals Derivation of Constants (KE, CW) for the Viability Equation for Pepper Seeds and the Subsequent Test of Its Applicability

HortScience ◽  
2009 ◽  
Vol 44 (6) ◽  
pp. 1679-1682 ◽  
Author(s):  
Ibrahim Demir ◽  
B. Begüm Kenanoglu ◽  
Kazim Mavi ◽  
Tuba Celikkol ◽  
Fiona Hay ◽  
...  
Keyword(s):  
Moisture Content ◽  
Seed Viability ◽  
Weight Basis ◽  
Fresh Weight ◽  
Fresh Weight Basis ◽  
Subsequent Test ◽  
Viability Loss ◽  
Orthodox Seeds ◽  
Controlled Deterioration ◽  
Pepper Cultivar

The effect of moisture on seed longevity during experimental storage was investigated in pepper (Capsicum annuum) cultivar Demre. Seeds were stored hermetically at 7.0%, 8.6%, 9.5%, 10.5%, and 12.1% moisture content (MC; percent fresh weight basis) and 35 °C for up to 306 d. Viability (normal germination) was assessed periodically and the seed viability equation moisture constants, KE and CW, estimated by regression of log σ (the sd of distribution of seed death in time) with log MC. KE and CW values were found to be 7.767 and 4.670, respectively. The newly found moisture constants were combined with the temperature constants that had already been proposed as universal for all orthodox seeds (CH = 0.0329, CQ = 0.000478) and their validity was tested by predicting the viability loss in another pepper cultivar, Carliston. The Ki of the Carliston cultivar was determined by controlled deterioration at 40 °C and 14% MC. The observed viability loss between 30 and 270 d at 25 °C and 10% seed MC was closely related to that predicted by the equation R2 = 0.982 (P < 0.001).

scholarly journals Temperature and Relative Humidity Govern Germination and Storage of Gladiolus Seed

HortScience ◽  
1991 ◽  
Vol 26 (8) ◽  
pp. 1054-1057 ◽  
Author(s):  
W.J. Carpenter ◽  
G.J. Wilfret ◽  
J.A. Cornell
Keyword(s):  
Relative Humidity ◽  
Seed Treatment ◽  
No Reduction ◽  
Germination Rate ◽  
Seed Viability ◽  
Seed Storage ◽  
Moisture Contents ◽  
Seed Moisture ◽  
Germination Temperature ◽  
And Storage

Gladiolus (G. grandiflorus) seed germination was light-independent, but temperature influenced the germination rate. Constant 20C promoted higher total germination (97%), fewer days (4.3) to 50% of final germination, and shorter span of days (4.8) between 10% and 90% germination than other constant temperatures, although similar results were achieved by alternating 12-h cycles of 20 to 25C. Total germination was unchanged after seed treatment for 7 days at 10 to -20C, but longer germination periods were required after treatments below -10C. Reducing seed moisture contents from 11.8% to 4.2% caused no reduction in total germination, but moisture contents below 6.6% delayed achieving 50% of final germination and extended the periods from 10% to 90% of germination. Temperature and relative humidity (RH) during storage were important in retaining seed viability, with RH having a larger effect. Smallest declines in total germination during 12 months of storage occurred at 11% and 33% RH at 15C. The statistical analysis estimated the optimum seed storage at 14C and 26% RH.

scholarly journals Mechanical damage caused by the use of grain carts for transport during soybean seed harvest

2018 ◽  
Vol 40 (4) ◽  
pp. 422-427
Author(s):  
Rodrigo Albaneze ◽  
Francisco Amaral Villela ◽  
Jean Carlo Possenti ◽  
Karina Guollo ◽  
Ivan Carlos Riedo
Keyword(s):  
Moisture Content ◽  
Seed Production ◽  
Seed Coat ◽  
Seed Viability ◽  
Mechanical Damage ◽  
Soybean Seed ◽  
Soybean Seeds ◽  
High Quality ◽  
Moisture Contents ◽  
Seed Harvest

Abstract: Mechanical damage constitutes one of the factors limiting production of high quality soybean seeds. The aim of this study was to evaluate the effects on seed viability and mechanical damage caused to soybean seeds when using a grain cart, together with an auger unloading system, as a means of transporting grain from the combine to the truck. Seed samples were collected in two seed production fields in the region of Abelardo Luz, SC, Brazil, at three different times (10:00, 12:30, and 16:00) and from three places (in the combine grain tank, in the grain wagon, and in the truck). The percentages of broken seeds, moisture content, mechanical damage to the seed coat, and germination were evaluated. The use of auxiliary grain cart equipment contributed to an increase in breakage and mechanical injury in seeds, worsening seed viability. Seeds collected at lower moisture contents had higher breakage and higher rates of mechanical damage.

Moisture relations of hay species

1958 ◽  
Vol 9 (4) ◽  
pp. 436 ◽  
Author(s):  
W Shepherd
Keyword(s):  
Chemical Composition ◽  
Relative Humidity ◽  
Moisture Content ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Experimental Conditions ◽  
Lolium Perenne L ◽  
Moisture Contents ◽  
Medicago Sativa L ◽  
Trifolium Repens L

Moisture relations of four species used for making hay—white clover (Trifolium repens L.), subterranean clover (Trifolium subterraneum L.), lucerne (Medicago sativa L.), and perennial ryegrass (Lolium perenne L.)—have been investigated. Shapes and positions of equilibrium moisture content-relative humidity curves differed between species; and in general, moisture contents were lower for fast-cured than for slow-cured material and lower for over-mature than for less mature material. Sorption hysteresis effects were observed. Under the experimental conditions employed, equilibrium moisture contents were lower for material subjected to conditioning atmospheres immediately after mowing than for material cured prior to conditioning. Variations in the shape and position of equilibrium curves were frequently in accordance with known variations in chemical composition.

Seed survival in Chilean Nothofagus in response to desiccation and storage

2005 ◽  
Vol 15 (2) ◽  
pp. 113-123 ◽  
Author(s):  
Pedro León-Lobos ◽  
Richard H. Ellis
Keyword(s):  
Moisture Content ◽  
Seed Quality ◽  
Seed Viability ◽  
Seed Storage ◽  
Forest Tree ◽  
Ex Situ ◽  
Hermetic Storage ◽  
Moisture Contents ◽  
Tree Seeds ◽  
Initial Seed

Nothofagus alpina,N. obliqua,N. glauca,N. leonii,N. dombeyiandN. pumilioseeds exhibited consistent, albeit slight, sensitivity to extreme desiccation, but nevertheless maintained viability at low moisture contents and cool temperatures (–10° to –20°C) over 2 years.Nothofagus alpina,N. obliqua,N. glauca,N. leoniiandN. dombeyiconformed to the seed viability equation of Ellis and Roberts; sensitivity of longevity to temperature was quantitatively similar to that of crop seeds, sensitivity to moisture was somewhat less, and a low-moisture-content limit to the equation was detected at 4.8% moisture content in hermetic storage at 65 °C, and possibly similar moisture contents at 30–40°C. These five species show orthodox seed storage behaviour. Therefore,ex-situconservation of theseNothofagusspecies in seed banks is possible, but the quality of seed lots collected requires attention. Seed storage behaviour was not defined inN. pumilio: initial seed quality was poor and loss of viability was detected over 2 years at 0°, –10° and –20°C at 2.7% moisture content, but not at 5.2%. The results confirm that the economy of nature in seed storage physiology extends to forest tree seeds, but the repeated observation of reduced sensitivity of longevity to moisture in forest tree seeds requires further investigation.

Changes in seed quality during seed development and maturation in tomato

1992 ◽  
Vol 2 (2) ◽  
pp. 81-87 ◽  
Author(s):  
I. Demir ◽  
R. H. Ellis
Keyword(s):  
Lycopersicon Esculentum ◽  
Moisture Content ◽  
Developmental Stage ◽  
Seed Development ◽  
Seed Quality ◽  
Seed Viability ◽  
Dry Weight ◽  
Seed Filling ◽  
Moisture Contents ◽  
Seed Moisture

AbstractChanges in tomato (Lycopersicon esculentumMill.) seed quality were monitored during seed development and maturation in glasshouse experiments in 2 years. The end of the seedfilling period (mass maturity) occurred 35–41 d after anthesis (differing among trusses) in 1989 and 42 d after anthesis in 1990. Seed moisture contents at this developmental stage were 53–72% (wet basis), while the onset of ability to germinate (during 21-d tests at 20°/30°C) and the onset of tolerance to rapid enforced desiccation occurred just before (1990) or just after (1989) mass maturity. In 1989, seed quality was assessed primarily by seedling size in a glasshouse experiment; maximum mean seedling dry weight 25 d after sowing was not achieved until 24–40 d after mass maturity. In 1990, seed quality was assessed primarily by germination following storage; maximum normal germination after 35 d in storage at 40 °C with 14 ± 0.5% moisture content was attained 23 d after mass maturity, but with little difference among seed lots harvested 10 d earlier or up to 30 d later. The results contradict the hypothesis that maximum seed quality is attained at the end of the seed-filling period and that seed viability and vigour begin to decline immediately thereafter.

scholarly journals MIGRATION OF SOLUBLE SALTS IN AN IRRIGATED FIELD IN RELATION TO RAINFALL AND IRRIGATION

1970 ◽  
Vol 50 (1) ◽  
pp. 43-45
Author(s):  
D. N. GRAVELAND
Keyword(s):  
Moisture Content ◽  
Water Table ◽  
Inverse Relationship ◽  
Soil Moisture Content ◽  
Salt Content ◽  
Growing Season ◽  
Soluble Salt ◽  
Soluble Salts ◽  
Sodic Soil ◽  
Precipitation Records

A saline sodic soil with a fluctuating water table was sampled once a week during the growing season and once every ten days until January to study the migration of soluble salts. The area, which was in pasture, was irrigated three times during the summer. The changes in soluble salt concentration were compared with the precipitation records, soil moisture content and water table levels. During the growing season, the soluble salt content varied over 100% and had an inverse relationship with moisture content.

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