Potato chip color, specific gravity and fertilization of potatoes with N−P−K

Kunkel, R.; Holstad, N.

doi:10.1007/bf02862816

Cited by 33 publications

(35 citation statements)

References 23 publications

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“…Fertilizer rates influence reducing sugar accumulation (15,18). Nitrogen appears to be indirectly related because of its effect on dry matter and relative maturity of the harvested tuber.…”

Section: )mentioning

confidence: 99%

Nitrogen and potassium fertilization of potatoes: Sugars and starch

Westermann¹,

James

Tindall

et al. 1994

American Potato Journal

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Considerable evidence exists that both N and K influence potato (Solanum tuberosum L.) yields and quality. The impact of nutrients on tuber quality parameters under field conditions should be identified so optimum management practices can be utilized. We evaluated the N and K fertilization by Ksources effects on concentrations of nutrients, reducing sugars, sucrose and starch in the stem and apical tuber ends from two irrigated field experiments with the Russet Burbank cultivar. Nitrogen rates of 0, 112, 224 or 336 kg ha-' were combined with selected K rates of 0, 112, 224 or 448 kg ha-' as either KCI or K2SQ4 arranged as an incomplete factorial. A multiple linear regression model was fit to the data and used to predict the response surface for a complete factorial for each K-source. Nitrogen applications increased or decreased reducing sugars in the apical and stem ends, respectively. Potassium decreased reducing sugars in both tuber ends. Sucrose was higher in the apical end than in the stem end but was not appreciably affected by fertilizer treatment. Nitrogen and potassium applications reduced dry matter and starch concentrations in both tuber ends. Potassium had a smaller effect on the apical end when starch was expressed on a dry weight basis, indicating that increased water content was a factor in the K effect. Both N and K concentrations in the tuber ends were negatively related to starch concentrations, but the relationship was different for the apical and stem ends. Tuber Cl concentration indirectly affected starch concentrations in the stem end when KCL was applied. The K fertilization effect on specific gravity depended upon the K concentration in the harvested tuber and was independent of K fertilizer source. These data illustrate the effects of preplant N and K fertilization rates on final tuber quality parameters. Additional studies are needed to further define the effects of nutrient concentrations at different plant growth stages. CompendioExiste considerable evidencia que tanto el N coma el K influencian los rendimientos y calidad de la papa (Solanum tuberosum L. campo, debe ser identificado de modo que pueden utilizarse practicas Optimas de manejo. Se evaluO la fertilizaciOn con N y K por los efectos de las fuentes de K sobre la concentraciem de nutrientes, los aplcares reductores, sucrosa y almidem en los extremos apical y terminal de tuberculos de dos experimentos de campo bajo irrigaciem, con el cultivar Russet Burbank. Se combinaron dosis de 0, 112, 224, o 336 kg ha' de N, con dosis seleccionadas de K de 0,112, 224 o 448 kg ha'', sea comb KC1 o como K2SO4, dispuestas como un factorial incompleto. Se dispuso la information convenientemente en un modelo de regresiOn linear multiple y se le utilizO para pronosticar la superficie de respuesta para un factorial completo para cada fuente de K. Las aplicaciones de N incrementaron o disminuyeron los azikares reductores en los extremos apical y terminal, respectivamente. El K redujo los azficares reductores en ambos extremos del tuberculo....

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“…Fertilizer rates influence reducing sugar accumulation (15,18). Nitrogen appears to be indirectly related because of its effect on dry matter and relative maturity of the harvested tuber.…”

Section: )mentioning

confidence: 99%

Nitrogen and potassium fertilization of potatoes: Sugars and starch

Westermann¹,

James

Tindall

et al. 1994

American Potato Journal

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“…The potato dry matter, which reflects other quality aspects such as the specific gravity and the starch content, increases with nitrogen fertilization till 150-200 kg ha (Shevchenko and Sidoreko, 1976) and at low potassium rates, whereas it decreases at high potassium rates (Muller, 1988). Specific gravity, which is positively correlated with the dry matter in potato tubers, decreases progressively with increasing potassium rates and -beyond a given thresholdwith the increases of nitrogen rates (Kunkel and Holstad, 1972). The starch content is also largely affected by fertilization; actually as the nitrogen availability increases in the soil, nitrogen has been shown to decrease progressively in the soil (Leszcynski and Lisinska, 1988).…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Fertilizing Formulae on Potato

Cucci¹,

Lacolla²

2007

Ital J Agronomy

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Trials conducted on potato fertilization at different rates of nitrogen, phosphorus and potassium have shown that the elements able to influence the marketable tuber yield are nitrogen and phosphorus. The potato dry matter, which reflects other quality aspects such as the specific gravity and the starch content, increases with nitrogen fertilization till 150-200 kg ha -1 of nitrogen; beyond those rates values remain nearly unchanged. Dry matter increases also with the application of phosphorus and at low potassium rates. The objective of the research was to test the effect of different rates of N P K fertilizer on yield and some quality traits of potato. The test was conducted at the Campus of the Agricultural Faculty, Bari University, Italy. It involved the comparison of 6 fertilizing formulae N 1 P 1 K 1 , N 1 P 2 K 1 , N 2 P 1 K 1 , N 2 P 2 K 1 , N 3 P 1 K 1 , N 3 P 2 K 1 , obtained from the factorial combination of three nitrogen levels (N = 100-200-300 kg ha -1) and two phosphorus rates (P 2 O 5 = 50-100 kg ha -1 ) against an unfertilized control N 0 P 0 K 0 . The dose of potassium was constant for all fertilizing formulae (K 2 O = 300 kg ha -1 ). The highest total and marketable yields of tubers per plant have been observed at the two highest fertilizing levels (N 3 P 1 K 1 , N 3 P 2 K 1 ), which are not statistically different so that the best treatments is shown to be N 3 P 1 K 1 ; the trend was similar for the mean weight of tubers. With the various treatments, no difference was observed in terms of yield of tubers belonging to the two first size classes (< 35mm and 35-55mm); what has increased with the fertilizing levels is the yield of tubers greater than 55 mm. Tuber specific gravity show, as expected, a positive correlation with the dry matter percentage. Both parameters increased shifting from the control to the N 2 P 2 K 1 and decreased at the highest N level, without any difference being observed with the change in the P rate. The highest starch percentage (20.5%) was also observed in the crop fertilized by N 2 P 2 K 1. Yield and yield components increase with the application of nitrogen fertilizer and do not change when applying high rates of phosphorus. The tubers with the highest specific gravity and starch content values are obtained when applying respectively 200 and 50 kg ha -1 of nitrogen and phosphorus.

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“…Recently, Zelalem et al (2009) also reported similar effects of N and P doses on dry matter content and specific gravity of potato in Ethiopia. After a long series of field experiments in the United States of America, Kunkel and Holstad (1972) also concluded that specific gravity of potato often decreased with increasing levels of N, P, and K.…”

Section: Resultsmentioning

confidence: 99%

The Effects of Different Nitrogen and Phosphorus Rates on Some Quality Traits of Potato

et al. 2010

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This study was conducted to determine the effects of nitrogen (0, 120, and 240 kg N ha −1 ) and phosphorus (0, 90, and 180 kg P 2 O 5 ha −1 ) doses on some tuber quality traits of the potato cultivar Agria under the ecological conditions of Erzurum in the years 2005 and 2006. The effects of N levels were significant only on the protein content of tubers while the P levels only significantly affected the oil content of the crisps. No significant N×P interaction effects were found on any of the traits evaluated. Based on these results, it could be concluded that the potato crop should be fertilized with 120 kgha −1 N and that phosphorus fertilizers should be added when soils are P deficient in the Erzurum region.

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Potato chip color, specific gravity and fertilization of potatoes with N−P−K

Cited by 33 publications

References 23 publications

Nitrogen and potassium fertilization of potatoes: Sugars and starch

Nitrogen and potassium fertilization of potatoes: Sugars and starch

Effects of Different Fertilizing Formulae on Potato

The Effects of Different Nitrogen and Phosphorus Rates on Some Quality Traits of Potato

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