scholarly journals Effect of white fleece on the selected quality parameters of early potato (Solanum tuberosum L.) tubers

2011 ◽  
Vol 49 (No. 8) ◽  
pp. 370-377 ◽  
Author(s):  
J. Laxhman ◽  
K. Hamouz ◽  
A. Hejtmánek ◽  
J. Dudjak ◽  
M. Orsák ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Solanum Tuberosum L ◽  
Ascorbic Acid Content ◽  
Field Trials ◽  
Quality Parameters ◽  
Cultivated Plants ◽  
Nitrate Content ◽  
Early Potato ◽  
Potato Tubers ◽  
Potato Genotype

The effects were tested of white fleece on the contents of ascorbic acid, nitrates, and polyphenols in 1999 and 2000, and on the carotenoids content in 2000 and 2001 intubers of two early potato varieties (Adora and Impala) in field trials on two cultivation sites (Přerov n/Labem and Prague-Troja). Early irrigated potatoes were cultivated according to the uniform methodology for field trials. Two variants were compared – cultivated plants covered with white fleece (Pegas-Agro UV 17) and the controls without any covering. The tubers were harvested three times in intervals of 7–16 days. The results were statistically tested by ANOVA and Tukey’s methods. Ascorbic acid content showed a tendency to higher values in the potatoes covered with white fleece as compared with the control samples (average increase by 12.3%). The effect of the fleece was significantly affected by the potato genotype and the year of cultivation (cv. Adora showed a content higher by 12.54% in comparison with the control). The tendency to reduce nitrate levels was observed in potato tubers cultivated under the fleece, especially in the second term of harvest (on average by 14.34%). The decrease between the first and the third term of harvest was apparent. The higher was the maturity of potato tubers, the lower nitrate content was found. Significant differences were found between the varieties (P = 0.0058) and the cultivation sites (P = 0.0399). The effect of white fleece on polyphenol content was not statistically significant. However, the effect of the year of cultivation on the polyphenols content was significant (P = 0.0094). The effect of white fleece on the carotenoids content was not statistically significant but a tendency to lower contents in the variant with white fleece was found (by 7.2%). The sites and the varieties affected the carotenoids contents significantly (P = 0.0028 and P = 0.0417, respectively).

scholarly journals Comparison of the effectiveness of digestate and mineral fertilisers on yields and quality of kohlrabi (Brassica oleracea, L.)

2011 ◽  
Vol 59 (3) ◽  
pp. 117-122 ◽  
Author(s):  
Tomáš Lošák ◽  
Andrea Zatloukalová ◽  
Monika Szostková ◽  
Jaroslav Hlušek ◽  
Jiří Fryč ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Ascorbic Acid Content ◽  
Quality Parameters ◽  
Nitrate Content ◽  
Fresh Matter ◽  
Urea Treatment ◽  
Yield And Quality ◽  
Triple Super Phosphate ◽  
One Year

In a one-year vegetation pot experiment we compared the effect of the digestate from a biogas station and mineral fertilisers on yield and quality parameters of kohlrabi, variety Seguza. Four treatments were used in the trial: 1) untreated control, 2) urea, 3) digestate, 4) urea, triple super phosphate, KCl, MgSO4. The rate of N was the same in treatments 2–4, 1.5 g N/pot. In treatment 4 the rate of P, K and Mg corresponded with the rate of these nutrients in the digestate treatment (3). The weight of single bulbs of the control unfertilised treatment were significantly the lowest (22.9%), as well as the nitrate (6.0%) and ascorbic acid content (66.2%) compared to the urea treatment (100%) and the other fertilised treatments. After the application of the digestate (treatment 3) and mineral fertilisers (treatment 4) the weight of single bulbs significantly increased by 27.9 and 29.2%, respectively, compared to the urea treatment (2). The content of ascorbic acid in the fertilised treatments did not differ (772–789 mg/kg) but it increased significantly compared to the unfertilised treatment (511 mg/kg). There were no significant differences between the two treatments fertilised with mineral fertilisers in the bulb nitrate content (678 and 641 mg NO3−/kg fresh matter, respectively). After digestate application their contents decreased significantly to 228 mg NO3−/kg fresh matter. Digestate treatment resulted in comparable or better yield and qualitative parameters compared to treatment with mineral fertilisers.

Polyacrylamid-Elektrophorese zur Beurteilung von Proteinen der Kartoffel (Solanum tuberosum L.)

1966 ◽  
Vol 21 (9) ◽  
pp. 879-888 ◽  
Author(s):  
Volkmar Loeschcke ◽  
Hermann Stegemann
Keyword(s):  
Ascorbic Acid ◽  
Solanum Tuberosum ◽  
Pore Size ◽  
Plant Material ◽  
Solanum Tuberosum L ◽  
Protein Pattern ◽  
Potato Tubers ◽  
Active Inhibitor ◽  
Electrophoretic Behavior ◽  
Acidic Proteins

Up to 25 proteins have been found in the sap of potato tubers by polyacrylamid electrophoresis. The mode of preparation and concentration of the plant material was investigated as well as the pretreatment of the polyacrylamid gel to avoid undue retardation of the migrating bands.Sulfite was the most active inhibitor of sap-browning compared with ascorbic acid and cysteine. which did not influence the protein pattern except for one line. The juice had to be dialyzed or filtered through Sephadex G 25 to remove an unkown acidic material which interferes with the more acidic proteins and causes spreading and diffusing of bands. Proteins were concentrated by means of Carbowax MW 20000. For best results ionic contaminations inherent in the gels was removed by electrophoresis before applying the proteins or dyes. Very few proteins were affected by decreasing the pore size of the gel. Ammonium sulfate (40% saturation) precipitated mainly those proteins which are similar in electrophoretic behavior to the albumin- and transferrinregion of human plasma.

scholarly journals Evaluation of Cherry Tomato Genotypes for Qualitative Traits under Open Field and Protected Condition

2020 ◽  
pp. 9-16
Author(s):  
. Chandni ◽  
Deepti Singh ◽  
Shirin Akhtar ◽  
Shiv Shankar Mahesh
Keyword(s):  
Ascorbic Acid ◽  
Open Field ◽  
Ascorbic Acid Content ◽  
Quality Parameters ◽  
Soluble Solids ◽  
Vegetable Crops ◽  
Cherry Tomato ◽  
Total Soluble Solids ◽  
Maximum Value ◽  
Β Carotene

Vegetable, due to higher neutraceutical component, are termed as protective food against various major and minor diseases. Scientific agro-techniques under optimum growing condition like temperature, relative humidity and light intensity, positively influence the qualitative and quantitative attributes of most of the vegetable crops including cherry tomato. It is one of potential vegetable crop, which is extensively utilized for table purpose and for preparing recipies in five star restaurants. Cherry tomato fetches higher prices in market due to good taste and higher nutrients, thus making qualitative attributes as an important factor to give higher returns to the farmers. Thus, this experiment was conducted to estimate the qualitative attributes in eighteen genotypes of cherry tomato grown under both open field and polyhouse conditions. The result of the study revealed that under open field condition, BRCT-30 was the best genotype with maximum value for lycopene content (6.62 mg 100-1 g FW) and β-carotene (2.30 mg 100-1 g FW), second maximum value for total soluble solids (7.85°Brix), third maximum value for reducing sugar and fourth highest position for ascorbic acid content (43.65 mg/100 g FW). Under polyhouse condition, the best genotype for quality parameters was BRCT-36 with maximum total soluble solids (10.81°Brix), lycopene (7.48 mg 100-1 g FW) and β-carotene (2.49 mg 100-1g FW) along with average range of values for ascorbic acid (72.36 mg 100-1 g FW) and titrable acidity (0.55 mg 100-1 g FW).

scholarly journals Agronomic and Environmental Aspects of Conservation Agriculture on Wheat Crop Production

2019 ◽  
Vol 7 (2) ◽  
pp. 161-166
Author(s):  
A. Bista ◽  
T.N. Joshi ◽  
K. Biswokarma ◽  
S. Yadav
Keyword(s):  
Crop Production ◽  
Solanum Tuberosum L ◽  
Sugar Content ◽  
Hollow Heart ◽  
Quality Parameters ◽  
Wheat Crop ◽  
Optimum Dose ◽  
Potato Tubers ◽  
Tuber Production ◽  
Potassium Application

Potato (Solanum tuberosum L.) is one of the major vegetable crops of Nepal. Potato is grown all over the globe and consumed as either vegetable or staple food depending upon the crop production scenario. It is also an integral part of human diet. Potato is a high nutrient mining crop and needs higher fertilization for economic tuber production. Despite sufficient application of Nitrogen (N) and Phosphorus (P2O5), low replenishment and widespread potassium deficiency are limiting the potato production in Nepalese condition. Growth parameters such as plant height, leaf area and chlorophyll% was positively correlated with potassium application. Potassium alleviated stresses of frost and drought and reduced incidence of diseases like late blight, black scurf and hollow heart. Potassium also decreased the reducing sugar content and improved chips color and quality. Similarly, potassium application before harvest was found to increase storage life of potato tubers. Furthermore, potassium application significantly increased the yield of potato tubers and quality parameters such as Vitamin C content and specific gravity. Source of potassium and method of potassium application also affected growth, yield and quality parameters. Soil application of potassium in splits coupled with foliar spay was found to perform better.  Optimum dose of potassium was recommended for economic tuber production Int. J. Appl. Sci. Biotechnol. Vol 7(2): 161-166  

scholarly journals The effect of selected factors on the content of protein and nitrates in potato tubers

2011 ◽  
Vol 51 (No. 10) ◽  
pp. 431-438 ◽  
Author(s):  
J. Lachman ◽  
K. Hamouz ◽  
P. Dvořák ◽  
M. Orsák
Keyword(s):  
Protein Content ◽  
Total Protein ◽  
Dry Matter ◽  
Field Trials ◽  
Nitrate Content ◽  
Potato Tubers ◽  
Total Proteins ◽  
Lower Region ◽  
Significant Difference

The aim of the study was to determine the effect of region, variety, year and ecological and conventional way of cultivation on the content of total protein and nitrates in potato tubers in three-year field trials. The effects of selected factors on nitrate and protein contents were similar, more significant for nitrates. Growing regions, varieties and years of cultivation caused statistically significant effects whereas the effect of ecological way of cultivation was less pronounced and showed a tendency without significance. Higher region showed lesser average nitrate (113.4 mg/kg) and protein content (4.27% dry matter) in comparison with lower region (143.7 mg/kg and 4.72% dry matter). The highest nitrate content was found in Impala and Karin varieties (199.2 and 167.6 mg/kg); Karin variety was also rich in total proteins (4.86% dry matter). Ecological way of cultivation showed no significant difference on nitrate content (136.9 mg/kg) and protein content (4.41%) as compared with conventional way of cultivation (153.9 mg/kg, 4.32%).

scholarly journals QUALITY, BIOACTIVE COMPOUNDS AND ANTIOXIDANT ACTIVITY DURING MATURATION OF ORANGES PRODUCED IN THE BORBOREMA TERRITORY

2019 ◽  
Vol 32 (2) ◽  
pp. 526-536 ◽  
Author(s):  
ANTÔNIO FERNANDO DA SILVA ◽  
BRUNO MARTINS DA SILVA ◽  
ALEX SANDRO BEZERRA DE SOUSA ◽  
VANDA MARIA DE AQUINO FIGUEIREDO ◽  
REJANE MARIA NUNES MENDONÇA ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Bioactive Compounds ◽  
Ascorbic Acid Content ◽  
Titratable Acidity ◽  
Quality Parameters ◽  
Soluble Solids ◽  
Total Antioxidant Activity ◽  
Family Farming ◽  
Total Antioxidant

ABSTRACT The family farming from the Borborema Territory-PB, Brazil, produces sweet oranges that supply the regional market. In this context, it is necessary to define standards of identity and quality, as well as to quantify the bioactive compounds in the fruit, in view of adding value and creating more competitive markets. This work sought to evaluate the quality, bioactive compounds and total antioxidant activity (TAA) of oranges from family farming. A 3x3 factorial completely randomized design was used, with three cultivars (Baía, Comum, Mimo-do-Céu) and three maturity stages (predominantly green, green/yellow, yellow), with 60 replications of 1 fruit for the physical evaluations, and 4 of 15 fruit for the others. The whole fruits were evaluated by color index, length, diameter, fresh weight and firmness. The juice was assessed for yield, pH, soluble solids (SS), titratable acidity (TA), SS/AT ratio, and ascorbic acid. Total extractable polyphenols (TEP) and ABTS•+ and DPPH• total antioxidant activity (TAA) were measured in the juice and albedo. The 'Baía' and 'Mimo-do-Céu' oranges presented quality parameters aligned with the CEAGESP standards. On average, the ascorbic acid content was higher than 45 mg 100 g-1, with ‘Mimo-do-Céu’ presenting the highest content (50.26 mg 100 g-1). During maturation, the firmness decreased, and the SS, TEP and TAA of the juice and the albedo increased. In general, the TEP content was about eight-fold higher in the albedo than juice, corresponding to the much higher TAA in this portion, thereby highlighting its higher functional potential, especially for ‘Baía’ orange.

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.

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