Effect of phosphorus on the specific gravity of potato tubers (Solanum tuberosum L.) of cultivars Kennebec and Coliban

1989 ◽  
Vol 29 (6) ◽  
pp. 869 ◽  
Author(s):  
NA Maier ◽  
KA Potocky-Pacay ◽  
AP Dahlenburg ◽  
CMJ Williams
Keyword(s):  
Specific Gravity ◽  
Field Experiments ◽  
Solanum Tuberosum L ◽  
Phosphorus Concentration ◽  
Potato Tubers ◽  
Significant Relationships ◽  
Linear Relationships ◽  
Phosphorus Application ◽  
The Relationship ◽  
Tissue Phosphorus

The effect of phosphorus banded at planting, at rates up to 240 kg/ha, on the specific gravity of tubers of cvv. Kennebec (10 sites) and Coliban (5 sites) was investigated using field experiments conducted during 1984-85, 1985-86 and 1986-87. The relationship between specific gravity and phosphorus concentration in petioles of youngest fully expanded leaves (P-YFEL) was also determined. As the rate of applied phosphorus increased there were significant positive and negative trends in specific gravity. However, the size of the effect varied between sites; for example, the maximum and minimum ranges in specific gravity (based on treatment means) due to phosphorus application were 1.0762-1.0869 (site 13) and 1.0753-1.0772 (site 24), respectively for the cv. Kennebec and 1.0598-1.0683 (site 22) and 1.0715-1.0753 (site 17), respectively for the cv. Coliban. Rates of applied phosphorus, which resulted in maximum specific gravity, also varied between sites. Maximum specific gravities occurred at phosphorus rates in the ranges 0-100 and 40-240 kg/ha for cvv. Kennebec and Coliban, respectively. There were significant relationships (5 quadratic and 1 negative linear) between phosphorus concentration in P-YFEL and specific gravity for cv. Kennebec at all 6 responsive sites. Phosphorus concentrations in P-YFEL associated with maximum specific gravities were in the range 0.29-0.51%. For cv. Coliban, over similar tissue phosphorus concentration ranges, there were significant (P<0.05) positive linear relationships for 1 responsive and 2 non-responsive sites. When data for cv. Kennebec were pooled for all sites, there was a significant (P<0.05) quadratic relationship between specific gravity and tissue phosphorus concentration (range 0.22-0.77%). For the cv. Coliban the trend was not significant (P>0.05). We have concluded that the rate of phosphorus banded at planting can affect specific gravity and that the cvv. Kennebec and Coliban differ in their sensitivity to this effect.

scholarly journals APPLICATION OF PECTIC POLYSACCHARIDES AS STIMULANTS FOR GROWTH AND DEVELOPMENT OF SOLANUM TUBEROSUM L.

2018 ◽  
pp. 289-298
Author(s):  
Алексей (Aleksey) Геннадьевич (Gennad'yevich) Тулинов (Tulinov) ◽  
Елена (Elena) Андрияновна (Andrianovna) Михайлова (Mikhailova) ◽  
Анатолий (Anatoliy) Александрович (Aleksandrovich) Шубаков (Shubakov)
Keyword(s):  
Aqueous Solutions ◽  
Growth And Development ◽  
Field Experiments ◽  
Crop Yields ◽  
Lemna Minor ◽  
Solanum Tuberosum L ◽  
Humus Content ◽  
Potato Tubers ◽  
Pectic Polysaccharides ◽  
Potato Plants

Crop yields can be significantly increased by using pectic polysaccharides – natural ecologically safe and effective plant growth stimulants. In this paper, high growth-stimulating activity of pectins with respect to potatoes is shown. The research was conducted in 2012–2015 in the Komi Republic (Syktyvkar) on sod-podzolic soils with an average humus content of 2.8–3.4%. The objects of the study in the field experiments were zoned potato varieties: early-ripening Gloria variety and the middle-aged variety Nevsky. The following pectic polysaccharides served as stimulants of potato growth and development: heracleuman – pectin of Heracleum sosnowskyi Manden., lemnan – pectin duckweed Lemna minor L. and silenan – pectin of callus tissue of campion Silene vulgaris (M.) G. Processing of potatoes with aqueous solutions of pectic polysaccharides included pre-planting soaking of potato tubers in water and spraying potato plants in the phases of 3–5 leaves and tuber formation. For processing potatoes, working solutions were used, which were prepared from 100 times diluted 0.002% aqueous solutions of pectins. The consumption of the working solutions of pectins were 10 liters on 1 ton of tubers and 300 l/ha of planting potatoes. Tubers and potato plants treated with water instead of pectins were used as control samples. It is established that all tested pectins possess growth-stimulating activity and processing of potatoes with aqueous solutions of pectic polysaccharides increases the early and overall yield of this crop, as well as the content of dry matter, starch and vitamin C in potato tubers.

Effects of nitrogen, phosphorus, and potassium on yield, specific gravity, crisp colour, and tuber chemical composition of potato (Solanum tuberosum L.) cv. Kennebec

1994 ◽  
Vol 34 (6) ◽  
pp. 813 ◽  
Author(s):  
NA Maier ◽  
AP Dahlenburg ◽  
CMJ Williams
Keyword(s):  
Chemical Composition ◽  
Specific Gravity ◽  
Field Experiments ◽  
Tuber Yield ◽  
Solanum Tuberosum L ◽  
Vascular Ring ◽  
Total Yield ◽  
First Order ◽  
Curvilinear Relationships ◽  
Main Effects

Five field experiments were conducted over 3 years in the Mt Lofty Ranges (4 sites) and the Upper South East (1 site) to examine the significance of main effects and interactions between nitrogen (N, up to 360 kg N/ha), phosphorus (P, up to 320 kg P/ha), and potassium (K, up to 480 kg K/ha) on total yield, yield of 80-350 g size grade, specific gravity, crisp colour, and chemical composition of tubers of potato cv. Kennebec. There were significant (P<0.05) main effects of increasing rates of applied N on total tuber yield and yield of 80-350 g tubers at 2 of the 5 experimental sites; the effect of applied P was significant at 3 sites, and applied K also at 3 sites. Application of N, P, and K increased total tuber yield by 13-432%, 19-145%, and 19-89%, respectively, at responsive sites. Increases in the yield of 80-350 g tubers were similar to those for total yield. There were significant first-order interactions (N x K, N x P, K x P) at 2 sites. The interactions were (i) response to the application of 1 nutrient limited by suboptimal rates of another; and (ii) yield depression, due to high rates of 1 or more nutrients. Nitrogen and P increased specific gravity at only 1 of the sites where they were applied. Potassium increased specific gravity at 1 site but decreased it at another. There were significant N x K, N x P, and K x P interactions at 2 sites. Vascular ring colour index (CI) and medulla CI were significantly (P<0.05) affected by rates of applied N, P, and K at 1, 3, and 4 experimental sites, respectively. Application of K (up to 480 kg K/ha) decreased vascular ring CI and medulla CI. Application of P increased the colour indices; for example, increasing the rate of P from nil to 160 kg/ha increased mean (� s.e.) vascular ring CI from 51 � 18 to 117 � 17. No interactions between N, P, and K in their effects on medulla CI were significant. For vascular ring CI, significant first-order interactions (K x N, K x P) were observed at 2 sites, at which application of N and P at nil K significantly increased vascular ring CI. At 240 or 480 kg K/ha, there was no change. Significant (P<0.001) curvilinear relationships were found between specific gravity and the concentrations of N, P, and K in the stem-end region of tubers; the coefficients of determination (r2) were 0.27, 0.62, and 0.76, respectively. For the combined medulla CI and vascular ring CI data, the corresponding values were 0.19 (P<0.001), 0.29 (P<0.001), and 0.05 (n.s.), respectively.

scholarly journals ASSESSMENT OF THE IMPACT OF VERMICOMPOST AND PEAT EXTRACTS ON NUTRIENT ACCUMULATION IN TUBERS AND POTATO YIELD

2018 ◽  
Author(s):  
Lidija VOJEVODA ◽  
Anita OSVALDE ◽  
Gunta ČEKSTERE ◽  
Andis KARLSONS
Keyword(s):  
Field Experiments ◽  
Foliar Application ◽  
Seed Tuber ◽  
Solanum Tuberosum L ◽  
Foliar Spray ◽  
Mineral Nutrient ◽  
Research Centre ◽  
Potato Tubers ◽  
The Impact ◽  
Tuber Treatment

Investigations on the potential beneficial effect of humic substances on crop plant cultivation under extremely diverse soil and climatic conditions is of global character, thereby knowledge obtained on the basis of local investigations are of great importance world-wide. The aim of the research was to evaluate the effect of different application methods (seed tuber treatment and foliar application) of commercially-produced peat and vermicompost extracts on nutrient uptake in tubers and yield of potato (Solanum tuberosum L.) using field experiments in organic farming system with potato variety ‘Borodjanskij Rozovij’. The tested extracts from the organic products included: peat extract (K45) and vermicompost extract (B45) obtained at +45°C by cavitation. The investigation was carried out at Stende Research Centre (Institute of Agro-resources and Economics) from 2011 to 2012. The chemical composition (N, P, K, Ca, Mg, S, Fe, Mn, Zn, Cu, Mo, B) of potato tubers was determined. The application of organic extract from vermicompost had a stimulating effect on mineral nutrient as N, P, K, Mg, and S accumulation in potato tubers, but 50% of cases showed reduction in Ca and Cu content that could influence the storage of tubers. The use of peat extract was significantly effective when the tubers were treated before planting. On average, tuber treatment and foliar spray with organic extracts contributed to 10% of tuber yield increase.

Effect of nitrogen, phosphorus, and potassium on yield and petiolar nutrient concentration of potato (Solanum tuberosum L.) cvv. Kennebec and Atlantic

1994 ◽  
Vol 34 (6) ◽  
pp. 825 ◽  
Author(s):  
NA Maier ◽  
AP Dahlenburg ◽  
CMJ Williams
Keyword(s):  
Field Experiments ◽  
Solanum Tuberosum L ◽  
Practical Importance ◽  
Total N ◽  
Nitrate N ◽  
N Concentration ◽  
Linear Relationships ◽  
The Difference ◽  
Highly Correlated ◽  
Potato Crops

Data are presented from 3 field experiments that studied the effects of nitrogen (N) up to 360 kg N/ha, phosphorus (P) up to 100 kg P/ha, and potassium (K) up to 480 kg K/ha on tuber yield and the concentration of N, P, and K in petioles of youngest fully expanded leaves (P-YFEL) of potato cvv. Kennebec and Atlantic sampled when the length of the longest tubers was 10-15 mm. Data on the significance of relationships between total N and P, total N and nitrate-N, and chloride and nitrate-N in P-YFEL are also presented. At 1 site, Atlantic yielded 18% higher than Kennebec; at another, it yielded 21% less. Significant K x cv. and N x cv. interactions occurred at some sites. Increasing rates of applied N significantly increased total N concentrations in P-YFEL at all sites and nitrate-N concentrations at sites that were N-deficient. At 1 site, increasing the rate of applied P from nil to 100 kg P/ha significantly increased total N concentration from 2.8 to 3.4%. Total N concentrations in P-YFEL of Atlantic were significantly lower than Kennebec. For total N, there were significant N x K and P x cv. interactions. There was no significant interaction between N, P, and K in their effects on nitrate-N concentration in P-YFEL. At all sites, the application of N and P significantly increased P concentrations in P-YFEL, and mean concentrations were significantly greater in Kennebec than Atlantic. At sites deficient in K, the application of K significantly decreased P concentration. Significant N x cv. and P x cv. interactions occurred at 2 sites. At both K-deficient and non-responsive sites, increasing rates of applied K significantly increased K concentrations in P-YFEL. Differences between cultivars in K concentration were not significant at 2 sites, and although significant at the third, the difference (0.2%) was of little practical importance. At 2 sites, significant N x K and K x P interactions were found. Significant positive linear relationships were found between total N and P concentrations in P-YFEL for both the experimental sites (r = 0.46-0.84) and commercial crops (r = 0.43-0.61). Except at site 1 (r = 0.85), total N and nitrate-N concentrations were not highly correlated. For 1 experimental site and for all the growing regions, there were significant negative linear relationships between nitrate-N and chloride concentrations in P-YFEL (r = -0.38 to -0.83). We suggest that the synergism between total N and P and the negative correlation between nitrate N and chloride are important factors to be considered to ensure reliable interpretation of early-season, petiole plant test data for these nutrients in potato crops; that the critical P and total N concentrations are different for Kennebec and Atlantic; and that when K is not yield-limiting, the main effects and interactions between K and total N, P, or nitrate-N do not confound the use of these nutrients in P-YFEL to assess the P, N, or K status of potato crops.

Prediction of the responsiveness to phosphorus of annual non-irrigated pasture in northern Victoria

1984 ◽  
Vol 24 (127) ◽  
pp. 579
Author(s):  
HR Jones ◽  
IR Maling ◽  
BC Curnow
Keyword(s):  
Environmental Factors ◽  
Field Experiments ◽  
Large Range ◽  
Biological Model ◽  
Soil Test ◽  
Olsen P ◽  
Phosphorus Application ◽  
The Relationship ◽  
Economic Criteria

Field experiments at 43 sites in the Bendigo district of northern Victoria were used to examine the responsiveness of annual non-irrigated pastures to phosphorus application. Of a large range of soil and environmental factors studied, the Olsen soil test (bicarbonate extraction) for phosphorus was the only one that was correlated with pasture response to phosphorus. The relationship for the sum of winter and spring production was: responsiveness b = 0. 12 + 0.73exp(- 0.25 Olsen P); 1 00R2 = 53.6, P< 0.01. Recommendations for the amount of superphosphate to apply to pastures in the Bendigo district are now based on the above relationship, which has been incorporated into a biological model to which economic criteria are applied.

EFFET DES DOSES, DES SOURCES ET DU MODE D’APPORT DE L’AZOTE SUR RENDEMENT ET LA MATURITE DE LA POMME DE TERRE CULTIVEE SUR DIFFERENTS TYPES DE SOLS DU QUEBEC

1982 ◽  
Vol 62 (3) ◽  
pp. 503-517 ◽  
Author(s):  
MARCEL GIROUX
Keyword(s):  
Specific Gravity ◽  
Nitrogen Fertilization ◽  
Field Experiments ◽  
Solanum Tuberosum L ◽  
Soil Series ◽  
Experimental Site ◽  
N Application ◽  
N Content ◽  
Tuber Specific Gravity ◽  
Total Soil N

The objectives of this work were to determine the effects of N-fertilizer sources, rates and fractionation on potato (Solanum tuberosum L.) yields, petiole-N content, defoliation and tuber specific gravity. To achieve these ends, urea and ammonium nitrate were side-dressed at 0, 70, 140 and 210 kg N/ha, by applying either all at planting or by fractionating the applications into half at planting and the other half a month later. The field experiments were carried out on eight sites consisting of six soil series. Nitrogen fertilization increased yields on all sites; the rate required for attaining maximum yields varied for 130 to 210 kg N/ha, according to the experimental site, with an average of 180 kg N/ha. Generally, both N-sources and fertilization methods had similar effects on yields defoliation, petiole N-content and tuber specific gravity. A 210-kg urea-N application at planting on the Lapointe loamy sand, however, decreased yields significantly. The importance of soil type, available water and total soil-N are discussed in relation to the quantities of fertilizer-N required to achieve maximum yields.

COPPER AND ZINC NUTRITION OF RUSSET BURBANK POTATOES GROWN ON PRINCE EDWARD ISLAND

1990 ◽  
Vol 70 (1) ◽  
pp. 357-362 ◽  
Author(s):  
J. B. SANDERSON ◽  
UMESH C. GUPTA
Keyword(s):  
Solanum Tuberosum ◽  
Specific Gravity ◽  
Prince Edward Island ◽  
Field Experiments ◽  
Tuber Yield ◽  
Solanum Tuberosum L ◽  
Leaf Tissue ◽  
Zn Content ◽  
Zinc Nutrition ◽  
Toxic Concentrations

Field experiments were conducted on potatoes (Solanum tuberosum L.) at two locations in P.E.I. to determine the response to soil- and foliar-applied Cu and Zn on tuber yield and leaf tissue nutrient concentration over a period of 3 yr. Foliar applications of 0.5–2 kg Cu ha−1 applied 1–2 wk prebloom reduced total tuber yield, number of tubers over 55 mm in diameter, average tuber weight, and specific gravity. The mean potato yield of tubers over 55 mm from the foliar-applied Cu treatments was less than the soil applied Cu by 4.5, 0.74, and 7.5 t ha−1 for 1985, 1986, and 1987, respectively. The toxic concentrations of Cu in potato leaves ranged from 63 to 139 μg g−1. Soil-applied Cu increased tissue Cu in the first sampling but had no effect in the second sampling. Foliar applications of Zn at 1–2 kg ha−1 reduced total tuber yield, tuber yield and tuber count over 55 mm, and specific gravity. The toxic concentrations of Zn in potato leaves ranged from 97 to 224 μg g−1. For the first sampling, the leaf tissue Zn concentrations ranged from 21 to 30 μg g−1 for the control and 27 to 70 μg g−1 for soil-applied Zn treatment. There was no difference in the Zn concentration between these two treatments for the second sampling. Copper and Zn concentrations as low as 7 and 21 μg g−1, respectively, in potato leaves were not related to deficiency of these nutrients, based on tuber yields. Soil applications of Cu or Zn would appear preferable to foliar sprays, which may cause phytotoxicity, as a means of increasing plant Cu or Zn content where a deficiency is suspected.Key words: Solanum tuberosum L., tuber yield, leaf copper, leaf zinc, Podzolic soil, potato

Linking ‘Halal’ Friendly Hotel Attributes and Customer Satisfaction:The Islamic Tourism Sector

2016 ◽  
Vol 4 (4) ◽  
pp. 43
Author(s):  
Lennora Putit ◽  
Mazzini Muda ◽  
Ainul Nadzirah Mahmood ◽  
Nor Zafirah Ahmad Taufek ◽  
Norhayati Wahib
Keyword(s):  
Customer Satisfaction ◽  
Dress Code ◽  
Significant Relationships ◽  
Tourism Sector ◽  
Managerial Implications ◽  
Halal Food ◽  
Increasing Demand ◽  
Islamic Dress ◽  
The Relationship ◽  
Survey Questionnaires

An increasing demand for Islamic tourism has driven the concept of a ‘Halal’ (or permissible) friendly hotel into another level of business insight within the consumers’ travel market. The concept via its unique value proposition has rapidly become very attractive not only to Muslim tourists, but also to non-Muslim tourists globally. This study aims to examine the relationship linking ‘Halal’ friendly hotel attributes and customer satisfaction. Using purposive sampling, a total of 410 survey questionnaires were distributed to targeted respondents with only 323 usable feedbacks and used for data analysis. Regression results revealed that four main “Halal-friendly hotel” attributes have significant relationships with customer satisfaction. These include prayer facilities, Halal food, Islamic dress code and general Islamic morality. Of these four attributes, prayer facilities proved to have the most significant impact on customer satisfaction. Findings and managerial implications were further discussed in this article.

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