The culture solution? Culture and common purpose in Australia

2013 ◽  
pp. 98-111
Keyword(s):  
Solution Culture ◽  
Culture Solution ◽  
Common Purpose

scholarly journals IMPROVEMENT OF HYDROPON INSTALLATIONS

2021 ◽  
pp. 119-127
Author(s):  
Ivan Sevostianov ◽  
Oleksandr Melnik
Keyword(s):  
Deep Water ◽  
Drainage System ◽  
Static Solution ◽  
Solution Culture ◽  
Culture Solution ◽  
Water Culture ◽  
Small Areas ◽  
Air Supply ◽  
Fresh Vegetables ◽  
Water Nutrients

Hydroponics is a promising area of development of modern agriculture, which provides long-term cultivation of basic vegetables and greenery in small areas with minimal consumption of water and fertilizers. This technology allows you to get a fairly large harvest of fresh vegetables within large cities, including office and residential premises. Entrepreneurs and researchers are paying close attention to developing more efficient hydroponics methods and equipment to implement them in order to reduce usable space, save water, nutrients and increase air supply and plant capacity. Several hydroponics systems are known: static solution culture, continuous flow solution (NFT) culture, deep water culture, passive irrigation, underwater and drainage irrigation systems, wastewater drainage system, deep-water fertilized culture, rotary system, aeroponics, wick system. The first three of the above methods were used commercially and industrially. The system of static culture solution does not provide the necessary saturation of plant roots with air. With the implementation of the method of continuous solution culture, minor buffering is possible due to interruptions in the flow (power outage), flooding of water in some canals, in addition, there are restrictions on the maximum length of canals (12 - 15 m). The system of deep-water culture on an industrial scale is used mainly for growing lettuce. Other mentioned systems are not efficient enough in terms of commercial use. The improved hydroponic installations presented in the article were developed taking into account the following requirements: universality of use (possibility of growing different types of plants); harmonization of optimal supply of crops with water, nutrients, light and air; maximum use of space; increasing the area for each plant and maintaining its stems and shoots. Also in the article the equation for definition of the basic parameters of the developed installations is given.

TOWARDS IMPROVING THE ALUMINIUM TOLERANCE OF WHITE CLOVER

1987 ◽  
pp. 163-169 ◽  
Author(s):  
J.R. Caradus ◽  
A.D. Mackay ◽  
M.W. Pritchard
Keyword(s):  
Intraspecific Variation ◽  
White Clover ◽  
Trifolium Repens ◽  
Shoot Growth ◽  
Solution Culture ◽  
Aluminium Tolerance ◽  
Growth Media ◽  
Culture Solution ◽  
Al Tolerance ◽  
Soil Culture

The objective of this study was to use two growth media to determine the extent of intraspecific variation for aluminium (Al).tolerance within white clover (Trifolium repens cv. Grasslands Huia). A further objective was to evaluate the sensitivity of the germinating and establishing seedling to Al. Addition of Al (500 mg kg-1 of soil) as Ah(SO,), to the Wainui silt loam (Typic Dystrochrept) which caused severe reductions in shoot growth of 30 d seedlings, only slightly reduced the germination or establishment of the seedling. This is an important finding as little would be gained from improving, by selection, Al tolerance in white clover if the plant was unable to germinate and establish in such unfavourable conditions. Sufficient intraspecific variation in Al tolerance exists within white clover to select for a superior Al-tolerant cultivar. Keywords: White clover, Trifolium repens, aluminium tolerance, soil culture, solution culture.

OBSERVATIONS ON THE ROOT NODULES OF SHEPHERDIA

1957 ◽  
Vol 35 (3) ◽  
pp. 305-314 ◽  
Author(s):  
I. C. Gardner ◽  
G. Bond
Keyword(s):  
Nitrogen Content ◽  
Root Nodules ◽  
Solution Culture ◽  
Nodule Development ◽  
Culture Solution ◽  
Atmospheric Nitrogen ◽  
Related Genus ◽  
Combined Nitrogen ◽  
Ecological Importance ◽  
Shepherdia Canadensis

Nodulated plants of Shepherdia canadensis have been raised in solution culture and shown to be able to grow and increase their nitrogen content in a solution free of combined nitrogen. A fixation of atmospheric nitrogen by the nodules is indicated by the data obtained, and under the prevailing conditions it attained a maximum of about 8 mg. per plant during the first season of growth from seed. The nodule development was secured by the application of an inoculum prepared from nodules of the related genus Hippophaë. Nodulation occurred at pH 6 and 7 but not at pH 5; it was also suppressed by the presence of small amounts of combined nitrogen in the culture solution. The capacity of the nodulated Shepherdia plant to fix nitrogen is probably of ecological importance.

INFLUENCE OF CULTURE SOLUTION TEMPERATURE ON UPTAKE OF PHOSPHORUS BY FLUE-CURED TOBACCO PLANTS

1960 ◽  
Vol 40 (2) ◽  
pp. 211-217 ◽  
Author(s):  
E. T. McEvoy
Keyword(s):  
Root Growth ◽  
Temperature Increase ◽  
Culture Medium ◽  
Solution Culture ◽  
Solution Temperature ◽  
Culture Solution ◽  
Tobacco Plants ◽  
Radioactive Phosphorus ◽  
Increasing Temperature

The influence of the temperature of the culture medium on the uptake of phosphorus by flue-cured tobacco plants was studied in solution culture, using radioactive phosphorus. P32 uptake increased significantly with temperature increase from 10° to 35 °C. for absorption periods of 2, 4, and 6 days. There was a further increase in P32 uptake at 40 °C. for absorption periods of 2 and 4 days but a decrease after 4 days. Increase in root growth during the absorption periods bore no relation to increase in P32 uptake with increasing temperature.

External calcium requirements for growth and nodulation of six tropical food legumes grown in flowing culture solution

1989 ◽  
Vol 40 (1) ◽  
pp. 85 ◽  
Author(s):  
RW Bell ◽  
DG Edwards ◽  
CJ Asher
Keyword(s):  
Root Growth ◽  
Inorganic Nitrogen ◽  
Phosphorus Deficiency ◽  
Solution Culture ◽  
Nutrient Concentrations ◽  
Nodule Formation ◽  
Culture Solution ◽  
Food Legumes ◽  
Maximum Root ◽  
External Calcium

Six tropical food legumes, peanut cv. Red Spanish, pigeonpea cv. Royes, guar cv. Brooks, soybean cv. Fitzroy, and cowpea cv. Vita 4 and CPI 282 15, were grown for 20 days at six constant solution calcium concentrations (2, 12, 50, 100, 500 and 2500 8M ) in flowing solution culture with adequate inorganic nitrogen (500 8M NO3 and with controlled nutrient concentrations. Bradyrhizobium CB756 was added at a rate of approximately 105 cells/ml of nutrient solution. Growth of all genotypes except guar was satisfactory at >12 8M calcium, with 75-100% of maximum root and shoot yield being obtained. Solution calcium concentrations required for maximum top growth were 12 8M for cowpea CPI 28215, 50 8M for peanut, 100 8M for soybean, and 2500 8M for cowpea cv. Vita 4, guar and pigeonpea. Root growth responded to solution calcium concentrations in the same way as top growth, except for cowpea cv. Vita 4 and pigeonpea, which both produced maximum root dry matter at 12 8M calcium. External calcium requirements for unrestricted growth may have been overestimated in guar because phosphorus deficiency appeared to limit growth at <500 8M calcium. Effects of suboptimal calcium concentrations included prevention of nodulation, delays in nodule appearance and a reduction in both nodule numbers and the proportion of plants which nodulated. Guar and pigeonpea formed nodules only at a 50 8M calcium, whereas cowpea and peanut formed nodules at 2 8M calcium. Maximum nodule numbers were recorded at lower (peanut), higher (cowpea cv. Vita 4, CPI 28215 and pigeonpea) or the same (guar) solution calcium concentration as that required for maximum root growth. Nodule formation in peanut was satisfactory at solution calcium concentrations as low as 12 8M. The results are discussed in relation to reports on the adaptation of these legumes to highly weathered soils low in calcium.

scholarly journals Effect of Applied Iron Concentration on Growth and Phylloclade Marginal Chlorosis of Holiday Cactus (Schlumbergera sp.)

1997 ◽  
Vol 122 (3) ◽  
pp. 438-444 ◽  
Author(s):  
Dario Ramirez ◽  
Harvey J. Lang
Keyword(s):  
Nutrient Solution ◽  
Symptom Severity ◽  
Ethylenediaminetetraacetic Acid ◽  
Iron Concentration ◽  
Solution Culture ◽  
Culture Solution ◽  
Symptom Development ◽  
Potting Medium ◽  
Monosodium Salt ◽  
Versus Solution

Two studies were conducted to determine the effect of applied Fe concentration on the occurrence of phylloclade marginal chlorosis in holiday cactus. Schlumbergera sp. `White Christmas', `Twilight Tangerine', `Christmas Charm', and `Lavender Doll' were grown in either solution culture or a peat-based medium and supplied with a nutrient solution containing Fe-EDTA at either 0, 0.18, 0.36, 0.54, or 0.72 mm. Growth decreased while marginal chlorosis increased on all cultivars as Fe-EDTA treatment levels increased. Phylloclade marginal chlorosis developed more severely and consistently in plants grown in peat-based media versus solution culture. Marginal chlorosis and accumulation of Fe in the potting medium occurred very slowly, and first symptoms were not observed until after about 2 months of treatment. Symptomatic phylloclade tissue had a greater Fe concentration than corresponding asymptomatic phylloclade tissue. Cultivars varied in tissue Fe concentration and symptom severity across Fe-EDTA treatments. There were no significant correlations in other tissue micronutrient concentrations with either Fe treatment or symptom development. The pH of either the culture solution or peat-based medium leachate did not change significantly throughout either study, and there were no significant amounts of Fe+2 detected in solution. Chemical name used: ferric ethylenediaminetetraacetic acid, monosodium salt (Fe-EDTA).

A general practice provider federation in a mixed health economy in England: a case study investigation

2018 ◽  
Vol 68 (suppl 1) ◽  
pp. bjgp18X696929
Author(s):  
Jill Mitchell
Keyword(s):  
General Practice ◽  
Shared Vision ◽  
Health Economy ◽  
Structured Interviews ◽  
The North ◽  
Common Strategy ◽  
Common Purpose ◽  
Collaborative Working ◽  
The Impact

BackgroundThere is an emerging debate that general practice in its current format is out-dated and there is a requirement to move to a federated model of provision where groups of Practices come together. The emergence of federations has developed over the past 5 years but the factors that influence how federations develop and the impact of this new model is an under researched area.AimThe study explored the rationale around why a group of independent GP practices opted to pursue an alternative business venture and the benefits that this strategy offered.MethodA single organisational case study of a federation in the North of England was conducted between 2011–2016. Mixed methods data collection included individual and group semi-structured interviews and quantitative surveys.ResultsFederations promote collaborative working, relying on strategic coherence of multiple individual GP practices through a shared vision and common purpose. Findings revealed many complexities in implementing a common strategy across multiple independent businesses. The ability of the federation to gain legitimacy was two dimensional – externally and internally. The venture had mixed successes, but their approach to quality improvement proved innovative and demonstrated outcomes on a population basis. The study identified significant pressures that practices were experiencing and the need to seek alternative ways of working but there was no shared vision or inclination to relinquish individual practice autonomy.ConclusionOrganisational development support is critical to reform General Practice. Whether central funding through the GP Five Year Forward View will achieve the scale of change required is yet to be evidenced.

Systemic Hybridity in the Mediation of the American Presidential Campaign

2017 ◽  
Author(s):  
Andrew Chadwick
Keyword(s):  
Data Gathering ◽  
Real Space ◽  
Presidential Campaign ◽  
Newspaper Coverage ◽  
The Internet ◽  
Major Theme ◽  
Power Resources ◽  
Electoral Outcomes ◽  
Media System ◽  
Common Purpose

Chapter 7 continues the revisionist approach of chapter 6, but paints the 2008 U.S. presidential campaign on a broader canvas. Through a detailed analysis of key episodes in the mediation of the campaign, the chapter shows how the real-space spectacles of candidate appearances continue to generate the important television, radio, and newspaper coverage that remains so crucial for projecting the power of a candidate and conveying enthusiasm, movement, authenticity, and common purpose to both activists and nonactivists alike. The chapter discusses how these television-fuelled spectacles now also integrate with newer media logics of data-gathering, online fundraising, tracking, monitoring, and managed volunteerism. A major theme running through this chapter is the growing systemic integration of the internet and television in presidential campaigns. It also shows how the hybrid media system can shape electoral outcomes by providing new power resources for campaigns that can create and master the system's modalities.

Sign in / Sign up

Export Citation Format

Share Document