scholarly journals Varietal differences in growth, development and tuber production of potatoes.

1981 ◽  
Vol 29 (2) ◽  
pp. 113-127
Author(s):  
H.D.G. Meyling ◽  
K.B.A. Bodlaender
Keyword(s):  
Growth Rate ◽  
Comparative Study ◽  
Growth And Development ◽  
Weather Conditions ◽  
Stem Growth ◽  
Tuber Growth ◽  
Tuber Production ◽  
Leaf Area Duration ◽  
Growth Development ◽  
Stem Development

In 1967-9, a comparative study was carried out on growth and development in relation to tuber production in 6 potato cv. Differences in productivity were not caused by 1 single growth or development parameter. The intervarietal yield differences were distinctly associated with genetic differences including leaf efficiency and size of the leaf apparatus, rate of stem growth and stem development and the earliness of cv., as well as by weather conditions. Early cv. were characterized by a higher growth rate and favourable DM distribution between June and July. Productivity of the later cv. was especially enhanced by a longer leaf area duration. This was a result of the slower senescence of the foliage during Aug. and Sept. The importance of the relation between stem and tuber growth was more distinct, whereas favourable tuber/stem ratios were independent of the earliness of cv. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Growth and Development of Organic Arsenical-Susceptible and -Resistant Common Cocklebur (Xanthium strumarium) Biotypes Under Noncompetitive Conditions

1994 ◽  
Vol 8 (1) ◽  
pp. 154-158 ◽  
Author(s):  
William E. Haigler ◽  
Billy J. Gossett ◽  
James R. Harris ◽  
Joe E. Toler
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Plant Height ◽  
Growth And Development ◽  
Reproductive Potential ◽  
Dry Weight ◽  
Growing Season ◽  
Xanthium Strumarium ◽  
Relative Growth ◽  
Growth Development

The growth, development, and reproductive potential of several populations of organic arsenical-susceptible (S) and -resistant (R) common cocklebur biotypes were compared under noncompetitive field conditions. Plant height, leaf area, aboveground dry weights, and relative growth rate (RGR) were measured periodically during the growing season. Days to flowering, bur dry weight, and number of burs per plant were also recorded. Arsenical S- and R-biotypes were similar in all measured parameters of growth, development, and reproductive potential. Populations within each biotype varied occasionally in plant height, leaf area, aboveground dry weights, and reproductive potential.

Growth and Productivity of Tapioca (Manihot utilissima) IV. Devlopment and Yield of Tubers

1974 ◽  
Vol 10 (1) ◽  
pp. 9-16 ◽  
Author(s):  
C. N. Williams
Keyword(s):  
Growth Rate ◽  
Root Length ◽  
Stem Growth ◽  
Tuber Number ◽  
High Yield ◽  
Tuber Growth ◽  
Tuber Weight ◽  
Storage Tissue ◽  
Slowing Down ◽  
Tissue Cells

SUMMARYRoot measurements on three Malayan varieties of tapioca (high, medium and low-yielding clones) showed that the onset of tuberization brings about a slowing-down or cessation of growth in root length, but no changes in stem growth rate were associated with the onset of tuber growth. High yield was associated with high tuber weight rather than with tuber number, which could be related to the size of storage tissue cells formed by the root cambium. The process of tuberization in tapioca is discussed generally.

Effects of parasitization by the insect parasite Hyposoter exiguae on the growth, development and physiology of its host Trichoplusia ni

Parasitology ◽  
1982 ◽  
Vol 84 (3) ◽  
pp. 491-510 ◽  
Author(s):  
S. N. Thompson
Keyword(s):  
Growth Rate ◽  
Weight Gain ◽  
Growth And Development ◽  
Trichoplusia Ni ◽  
Fat Body ◽  
Weight Ratio ◽  
Juvenile Hormone Esterase ◽  
Insect Parasite ◽  
Wet Weight ◽  
Growth Development

SummaryThe weight gain and growth rate of Trichoplusia ni larvae were severely depressed following parasitization by the insect parasite, Hyposoter exiguae. The development of the host was also delayed and juvenile hormone esterase activity present at the normal time of moulting was absent in parasitized insects. Similar effects on growth and development were achieved by rearing host insects on nutrient-deficient media. Accompanying the above effects of parasitization were alterations in dry/wet weight ratio and host haemolymph osmolality. Parasitization resulted in immediate increases in the concentrations of haemolymph non-glycogen carbohydrate (composed of trehalose, maltose and glucose) and protein. The concentration of fat body glycogen also increased following parasitization. In contrast, the concentration of haemolymph non-glycogen carbohydrate and protein, as well as fat body glycogen, decreased in nutrient-deprived larvae. The significance of the above results as they relate to the insect parasite–host relationship is discussed.

Interaction between competitors and predators and its effects on morphological and behavioural defences in Scinax nasicus tadpoles

Behaviour ◽  
2013 ◽  
Vol 150 (8) ◽  
pp. 921-937 ◽  
Author(s):  
Valeria I. Gómez ◽  
Arturo I. Kehr
Keyword(s):  
Growth Rate ◽  
Experimental Design ◽  
Growth And Development ◽  
Chemical Cues ◽  
Development Rate ◽  
Larval Morphology ◽  
Induced Defences ◽  
Morphological Defences ◽  
Growth Development ◽  
Determinant Factor

Predation affects the behaviour of organisms, and the number of conspecifics can influence the perception of predation risk. Two main types of traits, morphological and behavioural, are involved in the induced defences of many organisms. Here, we examined the influence of chemical cues of the predators Belostoma elongatum (Hemiptera, Belostomatidae) and Moenkhausia dichroura (Characiformes, Characidae) on the morphology, growth, development and activity of Scinax nasicus larvae. Our main goal was to determine whether the investment in morphological or behavioural defences varied according to the number of conspecifics and to the chemical cues of predators. To this end, we performed two experiments under microcosm conditions. In experiment 1, we determined morphological defences in tadpoles by analysing changes in morphology, growth rate and development rate, whereas in experiment 2, we determined behavioural defences by analysing changes in the activity of tadpoles. The experimental design consisted of two tadpole densities, with and without chemical cues of predators. We found that: (1) larval morphology, growth and development were significantly affected by density; (2) the chemical cues of the predators did not influence the morphology, growth or development of tadpoles; (3) tadpoles at high densities were more active than those at low densities; (4) tadpoles decreased the activity in the presence of chemical cues of M. dichroura; and (5) tadpoles increased the activity in the presence of chemical cues of B. elongatum. Our results suggest that density is a determinant factor of tadpole morphology of and that Scinax nasicus larvae respond to predators with behavioural defences, which vary according to the type of predator.

scholarly journals Population growth and development of two species of Cladocera, Moina micrura and Diaphanosoma birgei, in laboratory

2002 ◽  
Vol 62 (4a) ◽  
pp. 701-711 ◽  
Author(s):  
L. H. SIPAÚBA-TAVARES ◽  
M. A. BACHION
Keyword(s):  
Water Quality ◽  
Growth Rate ◽  
Population Growth ◽  
Growth And Development ◽  
Nutritional Value ◽  
Intrinsic Rate ◽  
Dry Weight ◽  
The Other ◽  
Growth Development ◽  
Dietary Treatments

The objective of the present work was to investigate the influence of four diets on population growth, development, total length, dry weight, and nutritional value of two zooplanktonic species, Moina micrura and Diaphanosoma birgei. The four dietary treatments were: algae alone (A); algae + vitamins (AV); algae + ration (AR); and algae + ration + vitamins (ARV). Growth rate peak for both species occurred faster with AV treatment. In general, AV treatment for M. micrura showed better results for intrinsic rate, fecundity, and embryonic and post-embryonic development. On the other hand, longevity and total spawning number were better with AR treatment (p < 0.05). Vitamin and ration treatments produced the best results in D. birgei species (p < 0.05). The highest percentage of protein and lipids for both cladocerans was verified for ration treatments. Carbohydrate was higher for the treatment containing algae alone (p < 0.05). Generally, diets containing ration and vitamin showed better results in cladocerans development, with water quality adequate for culture systems. Ration and vitamin diets may also be used in high-density cultures in the laboratory.

scholarly journals THE GROWTH AND ABSORPTION OF NUTRIENTS BY FERTILIZED AND UNFERTILIZED WHITE SPRUCE SEEDLINGS

1966 ◽  
Vol 42 (2) ◽  
pp. 127-136 ◽  
Author(s):  
K. A. Armson
Keyword(s):  
Growth Rate ◽  
Growth And Development ◽  
Dry Weight ◽  
Growing Season ◽  
White Spruce ◽  
Height Growth ◽  
Relative Growth ◽  
Uptake Rates ◽  
Abrupt Changes ◽  
Growth Development

A study was made of the effects of fertilizer additions on the growth and development of white spruce seedlings during their second growing season. In terms of dry weight increment, unfertilized trees grew for only two-thirds of the total growing season available as compared with fertilized trees. The relative growth rate curve for the fertilized trees was smooth with none of the abrupt changes which marked the curve for the unfertilized trees. The pattern of height growth was changed for seedlings which were fertilized. Nutrient uptake rates particularly for phosphorus were different under the two treatments and it is suggested that these differences were related to different patterns of height growth development and root extension.

Impact of FDI on GDP: A Comparative Study of India and China

2019 ◽  
Author(s):  
Arjun Hans ◽  
Dr. Farah Choudhary
Keyword(s):  
Economic Growth ◽  
Growth Rate ◽  
Comparative Study ◽  
Growth And Development ◽  
Market Size ◽  
Fdi Inflows ◽  
Economic Growth And Development ◽  
Coefficient Of Correlation ◽  
The World ◽  
India And China

FDI has been a catalyst for channelizing economic growth and development in a country. India and China are among the most attractive countries in the world to invest according to a recent UNTCAD survey. Domestic market size has been the most important factor responsible for investors preferring china. India is performing a better job than China in terms of utilization of resources on the larger scale. Though the FDI inflows of India are comparatively lower but the percentage growth in FDI inflows through these years have been dominating the percentage growth rate of FDI inflows of China. The figures we get from World Investment Report 2016 (UNTCAD) disclose that India’s inward stock makes a higher percent of its respective GDP which implies the better and optimum contribution of FDI into GDP. FDI’s greater contribution in the GDP and overall economy can attract more FDI inflows as compared to the lesser contribution in the GDP. We used Karl Pearson’s coefficient of correlation for correlating the values of FDI and GDP for India and China. It suggested a greater contribution of FDI into the GDP of India as compared to that of China’s.

scholarly journals The growth, development and meat qualities characteristics of different genotypes lambs

2021 ◽  
Vol 109 (1) ◽  
pp. 69-76
Author(s):  
V. Iovenko ◽  
◽  
I. Hladii ◽  
◽  
◽  
...  
Keyword(s):  
Growth Rate ◽  
Meat Quality ◽  
Gene Pool ◽  
Growth And Development ◽  
Live Weight ◽  
Experimental Animals ◽  
Genetic Potential ◽  
Growth Development ◽  
Ram Lambs ◽  
Meat Productivity

The growth, development and meat qualities characteristics of different genotypes lambs he growth and development features of three different genotypes ram-lambs, from their birth to six months age, were studied, in particular: purebred youngling of the Ascanian Fine-Fleeced breed (AFF), a cross of this gene pool with the Texel (AFFxT) and Merinolandschaf (AFFxM) breeds. Control over the growth and development these experimental animals was carried out by weighing in different age periods. The meat quality was assessed based on the slaughter results. It was found that the best development parameters were characteristic for the Texel crossbred with the Ascanian Fine-Fleeced breed; therefore, this crossing option has the meat productivity highest genetic potential. Keywords: sheep, genotype, live weight, linear parameters, growth rate.

A COMPARATIVE STUDY OF STUDENTS’ PREFERENCES FOR LEARNING ENVIRONMENT ON THE BASIS OF SCHOOL TYPES.

2017 ◽  
Vol 4 (36) ◽  
Author(s):  
Megha D’souza ◽  
Shefali Pandya
Keyword(s):  
Learning Environment ◽  
Comparative Study ◽  
Growth And Development ◽  
T Test ◽  
Dominance Test ◽  
Environment Scale ◽  
And Gender ◽  
Descriptive Method

Education is a potent force in developing a child into skilled, effective, productive and law-abiding citizen. It is therefore imperative that the environment for the education of the child is conducive and congenial for his growth and development. The aim of the study was to compare students’ preferences for learning environment on the basis of School Types. The study adopted the descriptive method of the Casual – Comparative type. The sample comprised of 574 standard VIII English medium students from schools. The tools used for the study were Preferred Learning Environment Scale by Fraser (1996) and Hemisphericity Dominance Test by Venkataraman. ANOVA and ‘t’ test was used to compare students’ preference for learning environment on the basis of hemisphericity and gender respectively. The findings are discussed in detail in the paper.

scholarly journals Release of Postsenescent Dormancy in Leafy Spurge (Euphorbia esula) by Chilling

Weed Science ◽  
1988 ◽  
Vol 36 (6) ◽  
pp. 784-786 ◽  
Author(s):  
Stephen J. Harvey ◽  
Robert M. Nowierski
Keyword(s):  
Growth Rate ◽  
North America ◽  
Growth And Development ◽  
Leafy Spurge ◽  
Climatic Conditions ◽  
Euphorbia Esula ◽  
Flower Buds ◽  
Significant Growth ◽  
Number Of Stems

The growth and development of leafy spurge (Euphorbia esulaL. #3EPHES) collected during postsenescent dormancy and grown in the greenhouse was increasingly stimulated by chilling treatments longer than 14 days duration at 0 to 6 C. Production of stems with flower buds, primary flowers, and secondary flowers was greater in plants chilled for 42 days or more. The effects of chilling on total number of stems, number of strictly vegetative stems, or number of stems with vegetative branching were not significant. The height of the tallest stem per pot was influenced by chilling longer than 42 days. Growth rate also increased as a function of chilling duration. Based on our findings, we believe that there is little possibility that any significant growth can occur in the postsenescent period because of the prevailing climatic conditions found in areas of leafy spurge distribution in North America.

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