scholarly journals Advances in Plant Nutrition: Re-evaluating Hoagland's Hydroponic Recipe after a Half Century

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 523B-523
Author(s):  
Bruce Bugbee
Keyword(s):  
Mass Balance ◽  
Nutrient Solution ◽  
Plant Nutrition ◽  
Plant Nutrient ◽  
Nutrient Requirements ◽  
Half Century ◽  
Hydroponic Solution ◽  
Recent Advances ◽  
Chloride Concentrations

Although the principle of mass balance is well-understood, few people understand how Hoagland and Arnon used it to develop their famous nutrient solution recipes. Here I review: 1) the application of mass balance in deriving unique hydroponic solution recipes, 2) the dangers of dumping and replacing hydroponic solutions, 3) the need to alter the silicon and chloride concentrations in Hoagland's solution based on recent advances in our understanding of plant nutrient requirements.

A continuous nutrient flow technique for comparative studies in plant nutrition

1962 ◽  
Vol 13 (6) ◽  
pp. 1054 ◽  
Author(s):  
CS Andrew ◽  
WHJ Pieters
Keyword(s):  
Nutrient Uptake ◽  
Nutrient Solution ◽  
Comparative Studies ◽  
Plant Nutrition ◽  
Nutrient Concentration ◽  
Compressed Air ◽  
Plant Nutrient ◽  
Nutrient Flow ◽  
High Concentrations ◽  
The Individual

A continuous nutrient flow technique for comparative studies of plant nutrient uptake is described. In this technique the nutrient solution enters a common mixing bowl before passing to the separate containers that are used for each batch or species of plants. The solution is continuously transferred through the individual containers by compressed air or pump at rates approximating 24 l./hr/container, and the nutrient concentration can be maintained within 5-10% of requirement by the introduction of fresh solution via the mixing bowl. The apparatus ensures uniformity of nutrient concentration and is equally adaptable to low and high concentrations.

Road Salt Application in Highland Creek Watershed, Toronto, Ontario - Chloride Mass Balance

2010 ◽  
Vol 45 (4) ◽  
pp. 451-461 ◽  
Author(s):  
Nandana Perera ◽  
Bahram Gharabaghi ◽  
Peter Noehammer ◽  
Bruce Kilgour
Keyword(s):  
Mass Balance ◽  
Management Practices ◽  
Chloride Concentration ◽  
Aquatic Organisms ◽  
Terrestrial Ecosystems ◽  
Road Salt ◽  
Winter Period ◽  
Chloride Mass Balance ◽  
Creek Watershed ◽  
Chloride Concentrations

Abstract Occurrence of increasing chloride concentrations in urban streams of cold climates, mainly due to road salt application, has raised concerns on its adverse effects on aquatic and terrestrial ecosystems. Therefore, there is a need for a better understanding of processes associated with road salt application and subsequent discharge into the environment in order to develop management practices to minimize detrimental effects of chlorides. The chloride mass analysis for the Highland Creek watershed based on four years of hourly monitoring data indicates that approximately 60% of the chlorides applied on the watershed enter streams prior to subsequent salting period, 85% of which occurs during the period between November and March. Contribution of private de-icing operations on chloride mass input within Highland Creek watershed was estimated to be approximately 38%, indicating its significance in overall chloride mass balance. Salt application rates, as well as chloride output in the streams, vary spatially based on land use, influencing chloride concentrations in surface waters. The estimated groundwater chloride concentration of 275 mg/L indicates that some aquatic organisms in Highland Creek would potentially be at risk even outside the winter period under dry weather flow conditions.

New Work on Speech Acts

2018 ◽  
Keyword(s):  
Speech Acts ◽  
Speech Act ◽  
Speech Act Theory ◽  
New Work ◽  
Half Century ◽  
Recent Advances ◽  
Current Thinking ◽  
Semantics And Pragmatics ◽  
Recent Developments ◽  
The Relationship

The essays collected in this book represent recent advances in our understanding of speech acts-actions like asserting, asking, and commanding that speakers perform when producing an utterance. The study of speech acts spans disciplines, and embraces both the theoretical and scientific concerns proper to linguistics and philosophy as well as the normative questions that speech acts raise for our politics, our societies, and our ethical lives generally. It is the goal of this book to reflect the diversity of current thinking on speech acts as well as to bring these conversations together, so that they may better inform one another. Topics explored in this book include the relationship between sentence grammar and speech act potential; the fate of traditional frameworks in speech act theory, such as the content-force distinction and the taxonomy of speech acts; and the ways in which speech act theory can illuminate the dynamics of hostile and harmful speech. The book takes stock of well over a half century of thinking about speech acts, bringing this classicwork in linewith recent developments in semantics and pragmatics, and pointing the way forward to further debate and research.

scholarly journals Seedling Production of Pak Choy (Brassica rapa L. var chinensis) using Organic and Inorganic Nutrients

2017 ◽  
Vol 9 (2) ◽  
Author(s):  
Dody Priadi ◽  
Fiqolbi Nuro
Keyword(s):  
Brassica Rapa ◽  
Nutrient Solution ◽  
Growth Parameters ◽  
Pearson Correlation ◽  
Leafy Vegetable ◽  
Inorganic Nutrients ◽  
Vegetable Production ◽  
Seedling Production ◽  
Hydroponic Solution ◽  
Organic Vegetable Production

<p>Pak Choy or Bok Choy (<em>Brassica rapa </em>L. var. chinensis) is one of favorite Chinese leafy vegetable for various dishes in Indonesia. In this study, it was used as a plant model to identify the appropriate organic hydroponic nutrient solution for leafy vegetable seedling production. The seed was sown on rock wool slabs submerged with 200 ml of a nutrient solution containing biofertilizer of <em>Beyonic StarTmik@Lob</em> (0, 25, 50, 75, and 100%). commercial hydroponic solution (0, 25, 50, 75, and 100%) and its combination (25, 50, and 75%). The experiments were arranged in a CRD. Meanwhile, the obtained data was analyzed using ANOVA followed by DMRT. The relationship among growth parameters was observed using Pearson correlation analysis.  The result of the study showed that the combination of organic and inorganic nutrient (25% <em>Beyonic StarTmik@Lob</em> and 75% commercial hydroponic solution) resulted in the highest seedling growth parameters and leaf indices as well as the perfectly positive correlations among growth parameters. This result indicated that the use of organic nutrient alone was not appropriate for hydroponic seedling production of Pak Choy. Therefore, further study needs to be done to identify the hydroponic solution without inorganic nutrients towards the organic vegetable production.</p>

scholarly journals CONTINUOUS USE OF PLANT NUTRIENT SOLUTION FOR HYDROPONIC CULTURE OF SWEETPOTATO:IMPLICATIONS AND EFFECTS

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 731d-731
Author(s):  
A.A. Trotman ◽  
P.P. David ◽  
D.G. Mortley ◽  
G.W. Carver
Keyword(s):  
Plant Growth ◽  
Nutrient Solution ◽  
Hydroponic Culture ◽  
Root Production ◽  
Plant Nutrient ◽  
Storage Root ◽  
Root Yield ◽  
Solution Composition ◽  
Greenhouse Study ◽  
Continuous Use

In a greenhouse study, continuous use of the same plant nutrient solution for hydroponic culture of sweetpotato was investigated to determine the effect on storage root yield, plant growth and nutrient solution composition. Plants were grown for 120 days under continuous flow from a 30.4-liter reservoir. Plant growth was compared when nutrient solution was changed at 14-day intervals and when nutrient solution was not changed but nutrients replenished through addition of a Modified half-Hoagland's (N:K=1:2.4) plant nutrient solution when volume in reservoir was -10 liters. Storage root yield was significantly decreased (181 vs 310.3 g/plant) and foliar biomass was significantly increased (372.4 vs 2% g/plant) when nutrient solution was not changed Nitrate and phosphate concentrations decreased in the plant nutrient over the duration of the experiment while sulfate and chloride concentrations increased. Salinity and electrical conductivity were monitored at 2-day intervals and increased with duration of the crop. Increased foliage production may have been the result of nitrogen replenishment going largely for foliage rather than storage root production. It may be that continuous use of the same plant nutrient solution as practiced in this study, resulted in lowered phosphate and nitrate concentrations that limited uptake of these ions by sweetpotato plants, thus reducing yield

scholarly journals Recent Advances in Chemical Sensors for Soil Analysis: A Review

Chemosensors ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 35
Author(s):  
Marina Nadporozhskaya ◽  
Ninel Kovsh ◽  
Roberto Paolesse ◽  
Larisa Lvova
Keyword(s):  
Chemical Sensors ◽  
Plant Nutrition ◽  
Soil Analysis ◽  
Soil Parameters ◽  
Multisensor Systems ◽  
The Past ◽  
Recent Advances ◽  
Sensitivity And Selectivity ◽  
Simple Measurement ◽  
Low Costs

The continuously rising interest in chemical sensors’ applications in environmental monitoring, for soil analysis in particular, is owed to the sufficient sensitivity and selectivity of these analytical devices, their low costs, their simple measurement setups, and the possibility to perform online and in-field analyses with them. In this review the recent advances in chemical sensors for soil analysis are summarized. The working principles of chemical sensors involved in soil analysis; their benefits and drawbacks; and select applications of both the single selective sensors and multisensor systems for assessments of main plant nutrition components, pollutants, and other important soil parameters (pH, moisture content, salinity, exhaled gases, etc.) of the past two decades with a focus on the last 5 years (from 2017 to 2021) are overviewed.

Plant Nutrition Recent Advances in Plant Nutrition R. M. Samish

BioScience ◽  
1973 ◽  
Vol 23 (5) ◽  
pp. 323-323
Author(s):  
Emanuel Epstein
Keyword(s):  
Plant Nutrition ◽  
Recent Advances
Sign in / Sign up

Export Citation Format

Share Document