Pre-planting Treatment of Seed Potato Tuber Pieces to Break Dormancy, Control Tuber Piece Decay and Improve Yield

1989 ◽  
Vol 25 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Mysore N. Shashirekha ◽  
Pattisapu Narasimham
Keyword(s):  
Gibberellic Acid ◽  
Potato Tuber ◽  
Trace Element ◽  
Crop Yield ◽  
Laboratory Tests ◽  
Laboratory Experiments ◽  
Field Tests ◽  
Salt Mixture ◽  
Breaking Dormancy ◽  
Microbial Agents

SUMMARYLaboratory experiments and field tests were used to study the effects of seven anti-microbial agents and a trace element salt mixture (TEM) on the decay of cut pieces of seed potatoes. The effect of a mixture of gibberellic acid and ethrel (GA + E), TEM, and TEM with GA + E on the sprouting behaviour and yield of tubers was also studied. All the anti-microbial agents inhibited decay, although TEM and oxine were superior to other treatments. There was an increase in crop yield when seed tubers were treated with TEM. In laboratory tests, the GA + E mixture and TEM were effective in breaking dormancy.

scholarly journals Point Load Test of Half-Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Fengyu Ren ◽  
Huan Liu ◽  
Rongxing He ◽  
Guanghui Li ◽  
Yang Liu
Keyword(s):  
Numerical Model ◽  
Laboratory Tests ◽  
Failure Load ◽  
Field Tests ◽  
Point Load ◽  
Diameter Ratio ◽  
Load Test ◽  
Index Test ◽  
Point Load Test ◽  
Calculation Procedures

The point load test (PLT) is intended as an index test for rock strength classification or estimations of other strength parameters because it is economical and simple to conduct in the laboratory and in field tests. In the literature, calculation procedures for cylinder cores, blocks, or irregular lumps can be found, but no study has researched such procedures for half-cylinder cores. This paper presents the numerical model and laboratory tests for half-cylinder and cylinder specimens. The results for half-cylinder and cylinder specimens are then presented, analysed, and discussed. A correlation of failure load between half-cylinder and cylinder specimens is established with a suitable size suggestion and correction factor. It is found that the failure load becomes stable when half-cylinder specimens have a length/diameter ratio higher than 0.9. In addition, the results show that the point load strength index (PLSI) of half-cylinder cores can be calculated using the calculation procedures for diametral testing on cylinder cores, and it is necessary to satisfy the conditions that the length/diameter ratio be higher than 0.9 and the failure load be multiplied by 0.8.

scholarly journals Comparison analysis of using micrometers and strain gauges for measuring deformations and loads in the method of monitoring the stress-strain state

2021 ◽  
Vol 18 (3) ◽  
pp. 71-75
Author(s):  
M. O. Lobovskiy ◽  
◽  
A. L. Tukkiya ◽  
P. A. Pyatkin ◽  
◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Strain Gauge ◽  
Laboratory Tests ◽  
Strain State ◽  
Field Tests ◽  
Strain Gauges ◽  
Construction Site ◽  
Comparison Analysis ◽  
Stress Strain ◽  
Stress Strain State

The micrometer method for measuring deformations and loads in bar elements has proved to be effective not only in laboratory tests, but also in field tests on a real construction site. Having carried out a comparative analysis of the method proposed by the authors for monitoring the stress-strain state (SSS) with the strain gauge method which is widely used at present, the authors have proved that the method for measuring deformations and loads using a micrometer is not inferior in accuracy to the strain gauge method, although it is much cheaper.

scholarly journals Acoustic nondestructive testing and measurement of tension for steel reinforcing members

2021 ◽  
Author(s):  
Michael McInerney ◽  
Matthew Brenner ◽  
Sean Morefield ◽  
Robert Weber ◽  
John Carlyle
Keyword(s):  
Laboratory Tests ◽  
Quantitative Methods ◽  
Longitudinal Velocity ◽  
Measurement Techniques ◽  
Field Tests ◽  
Shear Velocity ◽  
Structural Members ◽  
Unstressed State ◽  
Testing And Measurement ◽  
Theory And Model

Many concrete structures contain internal post-tensioned steel structural members that are subject to fracturing and corrosion. The major problem with conventional tension measurement techniques is that they use indirect and non-quantitative methods to determine whether there has been a loss of tension. This work developed an acoustics-based technology and method for making quantitative tension measurements of an embedded, tensioned steel member. The theory and model were verified in the laboratory using a variety of steel rods as test specimens. Field tests of the method were conducted at three Corps of Engineers dams. Measurements of the longitudinal and shear velocity were done on rods up to 50 ft long. Not all rods of this length were able to be measured and the quality and consistency of the signal varied. There were fewer problems measuring the longitudinal velocity than shear velocity. While the tension predictions worked in the laboratory tests, the tension could not be accurately calculated for any of the field sites because researchers could not obtain the longitudinal or shear velocities in an unstressed state, or precise measurements of the longitudinal and shear velocities due to the unknown precise length of the rods in the tensioned state.

Air speed effects during drying of harvested pasture material

1965 ◽  
Vol 16 (3) ◽  
pp. 385 ◽  
Author(s):  
W Shepherd
Keyword(s):  
Moisture Content ◽  
Laboratory Tests ◽  
External Surface ◽  
Field Tests ◽  
High Moisture Content ◽  
High Moisture ◽  
High Speeds ◽  
Field Investigations ◽  
Air Speed ◽  
Drying Rates

Laboratory and field investigations indicated effects of air speed on the drying rates of harvested clover and ryegrass. In laboratory tests, the drying rates of material of high moisture content increased with increasing air speed to 0.4 m sec-1 past single units or through bulked material, and to 4 m sec-1 over bulked material. These critical air speeds decreased as drying progressed. Critical through-speeds, initially unattainable even with high speeds over bulked material, could then be attained at moderate over-speeds. The effects were confirmed during field tests involving material bulked into swaths and windrows such as are employed in the field drying of mown pasture for conservation as hay. Effective external (surface) resistances of material in swaths and windrows were estimated to be 8–12 times those of plant units exposed singly. Evidence is presented that "turning" of material during field drying, to release entrapped water vapour, is necessary even on windy days in the early stages of drying, and on still days in the later stages. Under still but otherwise favourable conditions, turning appears necessary also as a substitute for the continuous supply of warm air to spaces within the bulk.

Biological control of Eutypa armeniacae. 4. Design and performance of an applicator for metered delivery of protective aerosols during pruning

1978 ◽  
Vol 18 (91) ◽  
pp. 287 ◽  
Author(s):  
MV Carter ◽  
LF Mullett
Keyword(s):  
Biological Control ◽  
Laboratory Tests ◽  
Field Tests ◽  
Piston Pump ◽  
Light Weight ◽  
Biological Matter ◽  
And Performance ◽  
Time Required ◽  
Aerosol Form ◽  
Three Components

The paper describes the development of a prototype applicator for delivery of protective mixtures, in aerosol form, to the wounded sapwood surfaces exposed during pruning. The equipment has three components : a 2 litre day-service tank, a light weight belt-mounted piston pump, and a modification of a standard pneumatic-powered pruning handgun. Laboratory tests of the applicator have proved its ability to deliver, repeatedly, a uniform dose of aerosol containing sufficient particulate chemical and/or biological matter to protect apricot sapwood from invasion by Eutypa armeniacae. Field tests of the equipment in two orchards demonstrated that from 90-100 per cent of wounds can be treated for the addition of less than 20 per cent to the time required to prune a tree. Over a period of three weeks' use no mechanical defects developed. Estimated volume of protective fluid required per day, treating up to 90 per cent of wounds, is less than two litres.

Kaolin Particle Film Prevents Galling by Gynaikothrips uzeli

2009 ◽  
Vol 10 (1) ◽  
pp. 21 ◽  
Author(s):  
David W. Held ◽  
Corey Wheeler ◽  
David W. Boyd
Keyword(s):  
Laboratory Tests ◽  
Laboratory Experiments ◽  
Ornamental Plant ◽  
Effective Alternative ◽  
Ficus Benjamina ◽  
Choice Tests

Feeding by Gynaikothrips uzeli Zimmerman (Thysanoptera: Phlaeothripidae), a pest thrips, induces galls on the ornamental plant Ficus benjamina, which disfigures plants and can facilitate incidental transport of pests. This study evaluated foliar applications of azadirachtin (Azatin XL), bifenthrin (Talstar), or kaolin (Surround WP) to prevent galling in field and laboratory experiments. Azadirachtin did not significantly prevent galling, but kaolin-treated cuttings had 80% reduction in number of galls in laboratory tests, and in the field, kaolintreated plants had ≥ 74% reduction in number of galls versus unprotected plants. Weekly applications of kaolin provided comparable protection to bifenthrin. Laboratory choice and no-choice tests indicate kaolin is not lethal and adult G. uzeli do not avoid kaolin-treated surfaces. Particle film products are an effective alternative to insecticides for preventing leaf galls on weeping fig. Accepted for publication 18 February 2009. Published 7 April 2009.

scholarly journals Evaluation of Energy Recovery from Laboratory Experiments and Small-scale Field Tests of Underground Coal Gasification (UCG)

2015 ◽  
Vol 131 (5) ◽  
pp. 203-218 ◽  
Author(s):  
Faqiang SU ◽  
Ken-ichi ITAKURA ◽  
Gota DEGUCHI ◽  
Koutarou OHGA ◽  
Mamoru KAIHO
Keyword(s):  
Energy Recovery ◽  
Laboratory Experiments ◽  
Coal Gasification ◽  
Field Tests ◽  
Small Scale ◽  
Underground Coal Gasification ◽  
Scale Field
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