Relation of Ascorbic Acid to Nitrate Content of Turnip Greens and to Methemoglobin Formation

1964 ◽  
Vol 14 (1) ◽  
pp. 52-55 ◽  
Author(s):  
LOIS KILGORE ◽  
ANN R. STASCH ◽  
B. F. BARRENTINE
Keyword(s):  
Ascorbic Acid ◽  
Nitrate Content ◽  
Methemoglobin Formation ◽  
Turnip Greens

scholarly journals Appraisal of Biodegradable Mulching Films and Vegetal-Derived Biostimulant Application as Eco-Sustainable Practices for Enhancing Lettuce Crop Performance and Nutritive Value

Agronomy ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 427 ◽  
Author(s):  
Eugenio Cozzolino ◽  
Maria Giordano ◽  
Nunzio Fiorentino ◽  
Christophe El-Nakhel ◽  
Antonio Pannico ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Plant Extract ◽  
Foliar Application ◽  
Agricultural Practices ◽  
Leafy Vegetables ◽  
Nitrate Content ◽  
Environmental Damage ◽  
Tropical Plant ◽  
Biodegradable Mulch ◽  
Mulching Films

Scientists, extensions specialists, and growers are seeking sustainable agricultural practices that are able to cope with these objectives in order to ensure global food security and minimize environmental damage. The use of mulching films and plant biostimulants in agriculture seems to be a valid solution for tackling these rising concerns. A greenhouse experiment was conducted in order to elucidate the morpho-physiological and nutritive characteristics of lettuce (Lactuca sativa L.) in response to foliar application of a tropical plant extract (PE) biostimulant and the use of plastic mulches. Two biodegradable mulch treatments (Mater-Bi® 1 and Mater-Bi® 2) were compared to black polyethylene (LDPE) and bare soil. Biodegradable mulch film Mater-Bi® 1 produced a comparable marketable fresh yield to the commercial standard polyethylene (LDPE), whereas Mater-Bi® 2 exhibited the highest crop productivity. When averaged over biostimulant application, lettuce plants grown with biodegradable film Mater-Bi® 2 exhibited superior quality traits in terms of K, Ca, total ascorbic acid, and carotenoids content. The combination of film mulching (LDPE, Mater-Bi® 1 or Mater-Bi® 2) with the tropical plant extract biostimulant exhibited a positive and significant synergistic effect (+30%) on yield. The PE-biostimulant induced higher values of SPAD index and total chlorophyll content when compared to untreated greenhouse lettuce. The mineral content of leaf tissues was greater by 10% and 17% (for P and Ca, respectively) when compared to the untreated lettuce (no PE application). Nitrate content was significantly reduced by 23% in greenhouse lettuce plants receiving PE as compared to the untreated control. The positive effect of Mater-Bi® 2 film on the ascorbic acid content has also been highlighted when combined with the biostimulant application, where a major amplification of total ascorbic acid (+168%) was recorded in comparison to the untreated lettuce. Overall, our work can assist leafy vegetables growers in adopting good agricultural practices, such as biodegradable plastic mulches and vegetal-derived biostimulants, to improve the sustainability of greenhouse production.

scholarly journals The effects of PLA biodegradable and polypropylene nonwoven crop mulches on selected components of tomato grown in the field

2014 ◽  
Vol 26 (2) ◽  
pp. 163-167 ◽  
Author(s):  
Izabela Zawiska ◽  
Piotr Siwek
Keyword(s):  
Ascorbic Acid ◽  
Dry Matter ◽  
Soluble Sugar ◽  
Soluble Sugars ◽  
Growing Season ◽  
Field Studies ◽  
Nitrate Content ◽  
Yield And Quality ◽  
Cotyledon Stage

ABSTRACT The results of two years (2010-2011) of field studies using two types of nonwoven mulches (one biodegradable, polylactic acid PLA 54 g m-2, and traditional polypropylene PP 50 g m-2) on the yield and quality of tomato are presented. Seeds of tomato (‘Mundi’ F1) were sown in a greenhouse, in containers filled with perlite and sand, and then the plants at the cotyledon stage were replanted in multipot trays filled with substrate for vegetable plants. In the last week of May, seedlings were planted on mulches in the field at a spacing of 50 × 100 cm. The mulch was maintained throughout the growing season. A plot that remained unmulched served as the control. Tomatoes were harvested once a week. The fruits were evaluated for L-ascorbic acid, dry matter, soluble sugars and nitrate content. In 2011, the analysis of the plant material showed that the concentration of L-ascorbic acid was about 23% higher in the tomato fruits harvested from plants grown on biodegradable PLA 61 g m-2 mulch in comparison to the control. A similar effect was demonstrated for the soluble sugar concentration in 2011 for both types of nonwovens.

SOME EFFECTS OF FOUR CHLORINATED POLYCYCLIC INSECT TOXICANTS ON THE PHYSIOLOGY OF POTATOES, CARROTS AND RADISH

1961 ◽  
Vol 41 (3) ◽  
pp. 578-586 ◽  
Author(s):  
A. M. Unrau ◽  
G. Howell Harris
Keyword(s):  
Ascorbic Acid ◽  
Phosphorus Content ◽  
Physiological Activity ◽  
Ascorbic Acid Content ◽  
Nitrate Content ◽  
Epoxide Ring ◽  
Oxygenated Compounds ◽  
Application Rates ◽  
Agar Media ◽  
Radish Seed

The physiological effects on certain plants of the chlorinated polycyclic insect toxicants aldrin, isodrin, dieldrin and endrin, when these were mixed with soil, were investigated. Under field conditions 3.5 and 6.5 pounds of toxicant per acre allowed maximum yields with potatoes and carrots; and at 9.5 pounds per acre yields were greater than those for the controls.Only minor changes in carotene and ascorbic acid content were observed. The chlorine content of both test plants was increased. In radish, ascorbic acid was generally depressed by the four compounds but nitrate uptake was increased by the epoxy compounds, dieldrin and endrin. The non-oxygenated compounds, aldrin and isodrin, depressed the nitrate content. Phosphorus content was depressed at higher application rates while at lower levels moderate increases in phosphorus content were observed in some cases.Within certain concentration limits, all four compounds stimulated germination of radish seed in soil. On agar media, 40 p.p.m. aldrin inhibited germination of radish seed, while 40 to 200 p.p.m. of dieldrin, endrin and isodrin stimulated germination.The presence of the epoxide ring appeared to be associated with physiological activity whereas, with one exception, the stereo-chemical configuration of the compounds was not associated with their activity.

Nitrate Content of Beets, Collarets, Turnip Greens

1963 ◽  
Vol 43 (1) ◽  
pp. 39-42
Author(s):  
Lois Kilgore ◽  
Ann R. Stasch ◽  
B.F. Barrentine
Keyword(s):  
Nitrate Content ◽  
Turnip Greens

scholarly journals Comparative Nutritional and Antioxidant Compounds of Organic and Conventional Vegetables during the Main Market Availability Period

Nitrogen ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 18-29
Author(s):  
Constantinos Roumeliotis ◽  
Anastasios S. Siomos ◽  
Dimitrios Gerasopoulos
Keyword(s):  
Ascorbic Acid ◽  
Antioxidant Capacity ◽  
Cropping System ◽  
Sampling Time ◽  
Soluble Solids ◽  
Nitrate Content ◽  
Total Phenolic ◽  
Antioxidant Compounds ◽  
Total Antioxidant ◽  
Conventional Systems

Seven winter and five summer vegetables produced under organic and conventional systems were collected from a supermarket seven times between January and April and between July and October for winter and summer vegetables, respectively, and their ascorbic acid and total phenolic content (compounds with proven antioxidant activity) as well as total antioxidant capacity, soluble solids and nitrates were determined. The results clearly indicated that, from the three factors studied (vegetable species, cropping system and sampling time), vegetable species made the highest contribution to ascorbic acid, phenolics, antioxidant capacity, soluble solids and nitrates. Results for each vegetable species showed that most organic vegetables appear to have lower nitrate content, some have higher phenolics, antioxidant capacity and soluble solids, and only few have higher ascorbic acid compared with conventional vegetables. The significance of the differences in nutritional and antioxidant value between organic and conventional vegetables is questionable, since vegetable species and sampling time can affect their nutritional value to a great or greater extent than the cropping system.

scholarly journals The potential of greenhouse diffusing cover material on yield and nutritive values of lamb’s lettuce grown under diverse nitrogen regimes

Italus Hortus ◽  
2020 ◽  
Vol 27 ◽  
pp. 55-67
Author(s):  
Eugenio Cozzolino ◽  
Christophe El-Nakhel ◽  
Eugenio Ottaiano ◽  
Ida Di Mola ◽  
Mauro Mori
Keyword(s):  
Ascorbic Acid ◽  
Nutritive Value ◽  
Ascorbic Acid Content ◽  
Mediterranean Area ◽  
N Fertilization ◽  
Nitrate Content ◽  
Diffuse Light ◽  
Commission Regulation ◽  
Lettuce Yield ◽  
Nitrogen Rates

Light and nitrogen are the main factors commanding horticulture production. Therefore, this study aims at evaluating the effects of two different greenhouse cover films (clear-Film A and diffuse light-Film B) on yield and nutritive value of a ready-to-eat salad lamb’s lettuce (Valerianella locusta L.), grown under several nitrogen regimes (no nitrogen [N0], sub-optimal [N25] and optimal N fertilization [N50] corresponding to 0, 25 and 50 kg ha-1 , respectively). The combination N50 and Film B boosted SPAD index by 10.3% and yield by 91.9% compared to N0 × Film A. Concerning antioxidant activity and bioactive compounds, only total ascorbic acid was positively affected by Film B (9.4%), while there was no effect of this cover film on carotenoids and chlorophyllous pigments, which increased along the increment of nitrogen rates. Nitrate content in leaves was influenced by both factors and it showed increasing values, when nitrogen doses increased, reaching the highest value under N50-Film B conditions (3312.3 mg kg-1 fw). Our study showed that in the Mediterranean area, the use of greenhouse diffuse light film improved lamb’s lettuce yield, but on the other hand incurred significant increase in nitrate level, nonetheless remaining constantly under the legal threshold imposed by the commission regulation (EU). Secondary metabolites, such as total phenols and carotenoids, showed similar values under both films, instead the diffuse light film improved total ascorbic acid content.

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