The effect of nitrogen fertilization upon potato chipping quality—Specific gravity II

1956 ◽  
Vol 33 (7) ◽  
pp. 211-213 ◽  
Author(s):  
Tom Eastwood ◽  
James Watts
Keyword(s):  
Specific Gravity ◽  
Nitrogen Fertilization ◽  
Chipping Quality

Genetic components of potato chip quality evaluated in three environments and under various storage regimes

1992 ◽  
Vol 72 (2) ◽  
pp. 535-543 ◽  
Author(s):  
D. R. Lynch ◽  
G. C. C. Tai ◽  
R. H. Coffin
Keyword(s):  
Specific Gravity ◽  
Combining Ability ◽  
Principal Component ◽  
Chip Color ◽  
Narrow Sense Heritability ◽  
Genetic Components ◽  
New Information ◽  
Total Variability ◽  
Highly Correlated ◽  
Chipping Quality

A diallel series of crosses was made between parents with good processing quality and nonprocessing but well-adapted varieties and breeding clones to study the inheritance of chipping quality and tuber yield in potatoes. The progeny of the crosses were assessed in three widely differing growing environments and chipped from a range of storage environments. Principal component analysis for chip color indicated that the first (PCA1) and second (PCA2) principal components accounted for 84.4 and 5.0% of the total variability, respectively. PCA1 scores were highly correlated (P < 0.01) with the mean chip color scores of the 20 crosses measured over the 11 environments, whereas PCA2 scores were highly correlated (P < 0.01) with the standard deviations of the chip scores over storage environments. These results provide new information that supports the recently proposed concept of two genetically independent systems determining chip color, i.e., "overall chipping quality" and "chipping stability". Highly significant (P < 0.01) general combining-ability and nonsignificant specific combining-ability effects suggest additive genetic factors and high narrow-sense heritability for specific gravity. Combining-ability effects for yield traits were generally nonsignificant, which probably reflects the selection of parents with proven breeding value.Key words: Solanum tuberosum, stability, yield, specific gravity

scholarly journals Effect of Fertilization on Growth and Wood Properties of Thinned and Unthinned Midrotation Loblolly Pine (Pinus taeda L.) Stands

2011 ◽  
Vol 35 (3) ◽  
pp. 142-147 ◽  
Author(s):  
Finto Antony ◽  
Laurence R. Schimleck ◽  
Richard F. Daniels ◽  
Alexander Clark
Keyword(s):  
Specific Gravity ◽  
Loblolly Pine ◽  
Nitrogen Fertilization ◽  
Block Design ◽  
Ring Width ◽  
Wood Properties ◽  
Fertilizer Application ◽  
Four Blocks ◽  
Earlywood Width ◽  
Pinus Taeda L

Abstract Growth and wood properties were measured on breast height cores collected from two stands, New Bern and Bertie, located in the lower Coastal Plain of North Carolina. The New Bern site was thinned before fertilizer application, and the Bertie site was not. The study was laid out in a randomized complete block design with each treatment replicated in four blocks at New Bern and two blocks at Bertie. The treatments were different levels of nitrogen fertilization: control (no nitrogen) and 112, 224, and 336 kg/ha. In addition, 28 kg/ha of phosphorus was included with each treatment. The objective of this study was to examine the response in growth and wood properties to midrotation fertilization in a thinned versus an unthinned stand. A significant decrease in latewood specific gravity was observed following nitrogen fertilization in the thinned stand but not in the unthinned stand. Whole ring width, latewood width, and earlywood width significantly increased following nitrogen fertilization at New Bern but not at Bertie. Whole ring specific gravity, earlywood specific gravity, latewood percentage, and earlywood:latewood ratio did not show any change due to fertilization in either stand. Responses in both growth and wood characteristics lasted for 2–3 years following fertilization and depended on the amount of fertilizer applied and whether or not the site was thinned. The response to nitrogen application was significant for the thinned stand only.

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.

Valence electron spectroscopy of inhomogeneous media

1992 ◽  
Vol 50 (2) ◽  
pp. 1150-1151
Author(s):  
A. Howie ◽  
D.W. McComb
Keyword(s):  
Specific Gravity ◽  
Loss Function ◽  
Electron Spectroscopy ◽  
Valence Electron ◽  
Peak Height ◽  
Loss Functions ◽  
Loss Peak ◽  
High Energies ◽  
Valence Electron Density ◽  
Electron Microscopist

The bulk loss function Im(-l/ε (ω)), a well established tool for the interpretation of valence loss spectra, is being progressively adapted to the wide variety of inhomogeneous samples of interest to the electron microscopist. Proportionality between n, the local valence electron density, and ε-1 (Sellmeyer's equation) has sometimes been assumed but may not be valid even in homogeneous samples. Figs. 1 and 2 show the experimentally measured bulk loss functions for three pure silicates of different specific gravity ρ - quartz (ρ = 2.66), coesite (ρ = 2.93) and a zeolite (ρ = 1.79). Clearly, despite the substantial differences in density, the shift of the prominent loss peak is very small and far less than that predicted by scaling e for quartz with Sellmeyer's equation or even the somewhat smaller shift given by the Clausius-Mossotti (CM) relation which assumes proportionality between n (or ρ in this case) and (ε - 1)/(ε + 2). Both theories overestimate the rise in the peak height for coesite and underestimate the increase at high energies.

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