Bacterial flora of the root surface of wheat grown in nutrient solutions deficient in nitrogen and phosphorus

1961 ◽  
Vol 6 (4) ◽  
pp. 279-281 ◽  
Author(s):  
J. Macura
Keyword(s):  
Bacterial Flora ◽  
Root Surface ◽  
Nitrogen And Phosphorus ◽  
Nutrient Solutions

scholarly journals Nitrogen and Phosphorus Preconditioning of Small-plug Seedlings Influence Processing Tomato Productivity

HortScience ◽  
1990 ◽  
Vol 25 (6) ◽  
pp. 655-657 ◽  
Author(s):  
Ronald W. Garton ◽  
Irvin E. Widders
Keyword(s):  
Lycopersicon Esculentum ◽  
Root Growth ◽  
Seedling Establishment ◽  
Shoot Growth ◽  
Nitrogen And Phosphorus ◽  
Processing Tomato ◽  
Shoot Tissue ◽  
Growing Medium ◽  
Marketable Fruit ◽  
Nutrient Solutions

Seedlings of processing tomato `H 2653' (Lycopersicon esculentum Mill.) were cultured in 288-cell (< 6 cm3 volume) plug trays in a soilless growing medium. Pretransplant fertilization with nutrient solutions containing 10 or 20 mm N and 2 or 5 mm P for 10 days altered the total ammoniacal-N and P, and the soluble NO3-N and PO4-P concentrations in the shoot tissue at transplanting. Post-transplanting shoot and root growth were more rapid in late May plantings than in earlier plantings. The 20-mm N and 2-mm P pretransplant treatment caused the most rapid shoot growth following early season plantings in the field. Rapid seedling establishment after transplanting was generally not a good indicator of potential fruit yield. The 5-mm P pretransplant treatment produced higher marketable fruit yields in early plantings but not in later. Culture of seedlings under a low fertilization regime (5.4 mm N, 1.0 mm P, and 1.6 mm K) before pretransplant treatment produced as high or higher fruit yields than did seedlings from a higher regimen. Withholding fertilizer temporarily before transplanting resulted in a depletion in tissue N and P concentrations, slow post-transplanting shoot growth, and lower yields.

The influence of nitrogen and phosphorus levels on the phytotoxicity of phenolic compounds

1980 ◽  
Vol 58 (10) ◽  
pp. 1149-1153 ◽  
Author(s):  
Lawrence G. Stowe ◽  
Ann Osborn
Keyword(s):  
Phenolic Compounds ◽  
Phenolic Acids ◽  
Vanillic Acid ◽  
Sand Culture ◽  
Nutrient Concentrations ◽  
Coumaric Acid ◽  
Nitrogen And Phosphorus ◽  
Chemical Inhibitors ◽  
Nutrient Solutions ◽  
Phosphorus Levels

The interaction between the phytotoxicity of certain phenolic compounds and deprivation of certain nutrients was investigated by means of a factorial experiment. Two concentrations of p-coumaric acid and two of vanillic acid were added to nutrient solutions containing various quantities of nitrogen and phosphorus, and these solutions were tested on barley plants in sand culture. Phenolic toxicity appears to depend intimately on nutrient concentrations; the phenolic acids were uniformly and significantly inhibitory only at low nutrient concentrations. Allelopathy with phenolics as chemical inhibitors seems most likely to occur in nutrient-poor soils.

EFFECTS OF NUTRITION, OSMOTIC PRESSURE, AND TEMPERATURE OF THE NUTRIENT SOLUTION ON PLANT GROWTH AND CHEMICAL COMPOSITION: I. SPRING WHEAT AT THE 4- TO 6-LEAF STAGE

1963 ◽  
Vol 43 (1) ◽  
pp. 44-50 ◽  
Author(s):  
D. G. Woolley
Keyword(s):  
Chemical Composition ◽  
Osmotic Pressure ◽  
Dry Matter ◽  
Nitrogen And Phosphorus ◽  
Leaf Stage ◽  
Phosphorus Absorption ◽  
Matter Production ◽  
Nitrogen Treatments ◽  
Composition I ◽  
Nutrient Solutions

Thatcher wheat at the 4- to 6-leaf stage was grown in nutrient solutions and subjected to five osmotic pressure levels of 0.5, 2.5, 5.5, 8.5, and 11 atmospheres with polyethylene glycol "Carbowax 4000". Root temperatures of 45°, 54°, 67°, and 80°F. and nitrogen treatments of 5, 25, 50, and 100 p.p.m. were also applied. Osmotic pressure and nitrogen treatments had only a small effect on dry matter production, whereas increasing root temperatures significantly increased dry matter in the shoots and roots. Treatment effects on nitrogen and phosphorus absorption and translocation are discussed.

THE EFFECT OF NITROGEN AND PHOSPHORUS NUTRITION ON pH OF TOMATO

1966 ◽  
Vol 46 (6) ◽  
pp. 681-684 ◽  
Author(s):  
J. S. Matthews ◽  
L. G. Denby
Keyword(s):  
Low Ph ◽  
The Other ◽  
Phosphorus Nutrition ◽  
Nitrogen And Phosphorus ◽  
Tomato Fruits ◽  
High Ph ◽  
Ph Values ◽  
Low Levels ◽  
Nutrient Solutions

Tomato fruits, grown under glass in inert media, and supplied with nutrient solutions containing high and low levels of N and P, varied in pH from 4.21 to 4.61. Fruits from plants receiving low levels of both nutrients consistently had low pH values. Those from plants fed high levels of P or N had high pH whenever the level of the other element was not limiting.

scholarly journals Effectiveness of domestic wastewater treatment using floating rafts a promising phyto-remedial approach: A review

2017 ◽  
Vol 9 (4) ◽  
pp. 1931-1942 ◽  
Author(s):  
Praveen Solanki ◽  
Maitreyie Narayan ◽  
R. K. Srivastava
Keyword(s):  
Wastewater Treatment ◽  
Aquatic Plants ◽  
Domestic Wastewater ◽  
Root Surface ◽  
Chemical Degradation ◽  
Nitrogen And Phosphorus ◽  
Water Lily ◽  
Development Orientation ◽  
Polluted Wastewater ◽  
Floating Rafts

Treatment of wastewater will lead to the problems again, if we will not use new more efficient alternative technologies/methods to avoid drawback of old technologies. Loss of water can be reduced through application of easy, inexpensive and eco-friendly technologies for wastewater treatment. Using Floating rafts to purify polluted wastewater is a process/method of ecological restoration at in-situ, as well as a complicated physical (attachment of pollutants to the root surface), chemical (degradation of metals into less toxic form) and biological process (microbial processes). Its core is utilizing aquatic plants such as Canna and Water lily and root attached microbes such as bac-teria, fungi and algae to absorb pollutants such as nitrogen and phosphorus, degrade organic matter and accumulates heavy metals in their biomass. Phytoremediation of polluted wastewater using the Floating rafts technique is an Eco-friendly method of wastewater treatment, which is economically effective to construct, requires little maintenance and increase the biodiversity as different types of plants are used. Floating rafts technique has been applied to some water pollution control projects at domestic and abroad. However, there are some factors such as plants, temperature, seasons, hydraulic retention time, coverage and initial concentration of pollutants etc. influenced to the pollutants removal efficiency of Floating rafts. In the future, the development orientation has been subjected to plant and its combinations, the transformation of Floating rafts structure and the utilization of aquatic plants, and probed the technology of Floating rafts building and management, to implement the win-win of landscape benefit and ecological function.

Effect of iron plaque on the root surface of hydrophyte on nitrogen and phosphorus transformation

2020 ◽  
Vol 12 ◽  
pp. 100566
Author(s):  
Xiaodong Wan ◽  
Yi Li ◽  
Chaoyu Li ◽  
Huijun Xie ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Root Surface ◽  
Iron Plaque ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Transformation

Influence of nitrogen and phosphorus supply on foliage growth and internal recycling of nitrogen in conifer seedlings (Prumnopitys ferruginea)

2003 ◽  
Vol 30 (1) ◽  
pp. 49 ◽  
Author(s):  
Fiona E. Carswell ◽  
Peter Millard ◽  
Graeme N. D. Rogers ◽  
David Whitehead
Keyword(s):  
Growth Habit ◽  
Nutrient Supply ◽  
First Year ◽  
Nitrogen Storage ◽  
Nitrogen And Phosphorus ◽  
Indeterminate Growth ◽  
Indeterminate Growth Habit ◽  
Second Year ◽  
Nutrient Solutions ◽  
Internal Cycling

The dynamics of internal cycling of nitrogen were studied in the southern hemisphere conifer miro [Prumnopitys ferruginea (G. Benn. ex D. Don) de Laub.], which has an indeterminate growth habit. In a 2-year experiment, P. ferruginea seedlings were supplied with nutrient solutions consisting of two different concentrations of nitrogen (5 and 0.5 mM) and phosphorus (1.33 and 0.133 mM) in the first year, and two concentrations (5 and 0.5�mM) of a 15N-labelled nitrogen solution in the second year. Growth and nitrogen content of new foliage were shown to be largely dependent on seedling nitrogen status at the end of the first year, and only weakly dependent on nutrient supply in the second. An average of 70% of total nitrogen in new foliage was remobilised from storage in the first 63 d after flushing began. The remainder of new-foliage nitrogen was derived by root uptake from the nutrient supply in the second year. There was some response of nitrogen uptake to high nitrogen supply in the second year where seedlings had been nitrogen deficient at the end of the first year. However, it was concluded that the indeterminate growth habit of P. ferruginea did not distinguish its pattern of nitrogen storage and remobilisation from that of determinate conifers.

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