Factors affecting the relationship between tuber size and dry-matter content

1974 ◽  
Vol 51 (7) ◽  
pp. 233-242 ◽  
Author(s):  
O. P. Ifenkwe ◽  
E. J. Allen ◽  
D. C. E. Wurr
Keyword(s):  
Dry Matter ◽  
Matter Content ◽  
Tuber Size ◽  
Dry Matter Content ◽  
Factors Affecting ◽  
The Relationship

Effects of defoliation and time of harvest on tuber dry-matter percentage of Pentland Crown Potatoes

1986 ◽  
Vol 107 (3) ◽  
pp. 723-733 ◽  
Author(s):  
S. J. Wilcockson
Keyword(s):  
Water Uptake ◽  
Dry Matter ◽  
Matter Content ◽  
Tuber Size ◽  
Dry Matter Content ◽  
Mechanical Method ◽  
Tuber Dry Matter ◽  
The Relationship ◽  
Time Of Harvest ◽  
Main Factor

Two experiments are reported which investigated the effects of time and method of crop defoliation and of extending the interval between defoliation and harvest on the relationship between dry-matter percentage and tuber size in Pentland Crown potatoes.Differences in average tuber dry-matter content between seasons and treatments were large, but the relationship between tuber dry-matter percentage and tuber size was always negatively quadratic. The dry-matter content of tubers of all sizes invariably decreased after defoliation, by about 0·6 % on average for each week that harvest was delayed in 1983 and 0·3 % in 1984. The largest decrease was from 22·7 to 16·7 % over the 10-week period following mechanical defoliation in mid-August 1983. In 1984, chemical defoliation in mid-August gave a smaller decrease than the mechanical method (0·25 and 0·38%/week) but their effects were similar when carried out in mid-September. Water uptake was the main factor responsible for the decrease because evidence showed that fresh weights of tubers increased proportionally following defoliation whilst dry weights remained virtually constant.Natural senescence was late in both seasons experiments so that the crops foliage was still mostly alive when defoliation occurred, even in September and early October. Thus, the relatively large effects of late defoliation may have been greater than might be expected where haulm senescence is already well advanced by this time and water uptake has almost ceased. Nevertheless, the decline in dry-matter percentage which may occur between defoliation and harvest can be extremely important where potatoes for processing are concerned. It could make them unacceptable for particular outlets and should be considered when defoliation and harvesting programmes are planned.

scholarly journals A model describing the relationship between electrical conductivity and forage dry matter content

2000 ◽  
Vol 43 (4) ◽  
pp. 361-364
Author(s):  
Gilad Ashbell ◽  
Evert Evers ◽  
Ate H. Bosma
Keyword(s):  
Electrical Conductivity ◽  
Dry Matter ◽  
Matter Content ◽  
Ash Content ◽  
Dry Matter Content ◽  
Alternative Method ◽  
The Relationship

The correlation between dry matter (DM) content, electrical conductivity (EC) and ash content was found to be linear in grass and alfalfa during drying. While minerals in grass and alfalfa were very stable components during drying, their concentrations and EC increase accordingly; therefore, the EC value could serve as a measurement to determine DM content. Results indicated that EC measurement in grass and alfalfa during drying was simple, accurate, fast and easily repeatable, and could serve as an alternative method for DM determination.

COMPARISON OF GRAIN YIELD AND WHOLE-PLANT SILAGE PRODUCTION OF RECOMMENDED CORN HYBRIDS

1983 ◽  
Vol 63 (3) ◽  
pp. 601-609 ◽  
Author(s):  
M. R. VATTIKONDA ◽  
R. B. HUNTER
Keyword(s):  
Grain Yield ◽  
Dry Matter ◽  
Lignin Content ◽  
Quality Parameters ◽  
Matter Content ◽  
Dry Matter Content ◽  
Whole Plant ◽  
Silage Production ◽  
The Relationship

A 2-yr study was conducted at Elora and Brucefield, Ont. to examine the relationship between grain yield following grain physiological maturity and whole-plant dry matter (DM) yield and quality determined at the stage desirable for ensiling. Quality parameters analyzed include in vitro dry matter digestibility (IVD) of the stover, IVD of the whole plant, stover lignin content and stover protein content. There was a significant linear relationship between the performance of hybrids for grain yield production and their yield for silage production. However, the relationship was not complete enough to permit reliable selection of hybrids for silage production based on grain yield performance (coefficients of determination were 0.23 and 0.25 for Elora and Brucefield, respectively). Grain dry matter content, however, provided a satisfactory estimate of whole-plant maturity for silage production. Coefficients of determination between grain DM content and whole-plant DM content were 0.71 and 0.53 for Elora and Brucefield, respectively. There was considerable variation among hybrids for lignin content and IVD of stover. Differences were much less for whole-plant IVD. The findings of this study support the need for separate evaluation trials for corn grown for whole-plant silage production as opposed to grain production.Key words: Zea mays, corn silage, grain yield, hybrid performance

scholarly journals Relationship between dry matter content at harvest and maturity index and post-harvest quality of ‘Fuji’ apples

2018 ◽  
Vol 40 (2) ◽  
Author(s):  
Marcelo José Vieira ◽  
Luiz Carlos Argenta ◽  
James Peter Mattheis ◽  
Cassandro Vidal Talamini do Amarante ◽  
Cristiano André Steffens
Keyword(s):  
Dry Matter ◽  
Apple Fruit ◽  
Matter Content ◽  
Maturity Index ◽  
Dry Matter Content ◽  
Post Harvest ◽  
Long Term Storage ◽  
The Relationship ◽  
Term Storage

Abstract Two experiments were carried out to evaluate the relationship between dry matter content (DMC) and maturity index of ‘Fuji’ apple fruit sports (‘Mishima’, ‘Fuji Select’ and ‘Fuji Suprema’) during the final stage of fruit growth, and the relationship between DMC at harvest and the post-harvest fruit quality. Fruit were harvested from orchards of three regions (Caçador, São Joaquim and Vacaria), on two rootstocks (M9 and Marubakaido with M9 interstock). In experiment 1 (2014), fruit were periodically sampled beginning 83 days before the commercial harvest period. In experiment 2, fruit were harvested at optimum maturity for long-term storage and stored in air at 0.5 ºC (2014) or after optimum maturity for long-term storage and stored in controlled atmosphere at 0.7 ºC (2014 and 2015). Apple fruit maturity on the tree was characterized by decreased flesh firmness and increased starch index and soluble solids content (SS) and by a small change in DMC. DMC at harvest was correlated with flesh firmness and SS in one of two years, but DMC was not correlated with the incidence of disorders after storage. The results show that DMC at harvest is not suitable as a maturity index of ‘Fuji’ apples, and its use as a post-harvest quality predictor is not consistent between crop years.

Factors affecting diet selection by sheep. 3. Dry matter content and particle length of forage

1984 ◽  
Vol 35 (6) ◽  
pp. 831 ◽  
Author(s):  
PA Kenney ◽  
JL Black ◽  
WF Colebrook
Keyword(s):  
Dry Matter ◽  
Vegetative State ◽  
Matter Content ◽  
Dry Matter Content ◽  
Intake Rate ◽  
Similar Material ◽  
Factors Affecting ◽  
Kikuyu Grass ◽  
Particle Length ◽  
Matter Basis

The effects of dry matter content and particle length of forage on potential intake rate and preference by sheep were investigated using six animals held in metabolism cages. In experiment 1, freshly harvested kikuyu grass (Pennisetum clandestinum) in its vegetative state was mixed in different proportions with similar material that had been oven-dried to form 15 diets ranging in dry matter content from 15 to 94%. Intake rate of wet matter decreased from 60 to 14 g/min as dry matter content increased, whereas the intake rate of dry matter increased from 9 to 14 g/min as the dry matter content of forage rose to about 40% but remained relatively constant thereafter. In experiment 2, undried kikuyu grass was eaten faster and formed a greater proportion of total intake than did dried kikuyu when expressed on a wet matter basis, but the amount of dry matter consumed from each forage was similar when they were offered together in separate containers. Kikuyu chopped to 10-mm length was eaten faster and was also preferred over kikuyu cut to 40 mm, irrespective of its dry matter content. Factors other than intake rate such as taste, odour or feel did not contribute markedly to the preference for either undried or dried kikuyu. Equations developed previously using results from dried forages predicted preference from intake rate quite well for dried forage but not for undried forage. It is suggested that the intake rate of dried forages may be a useful predictor of the preference for dry matter with forages containing any proportion of moisture, but further research is needed.

scholarly journals Effect of Gender on Factors Affecting Excreta Dry Matter Content of Broiler Chickens

2007 ◽  
Vol 16 (2) ◽  
pp. 226-233 ◽  
Author(s):  
N. Ziaei ◽  
J.H. Guy ◽  
S.A. Edwards ◽  
P.J. Blanchard ◽  
J. Ward ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Dry Matter ◽  
Matter Content ◽  
Dry Matter Content ◽  
Factors Affecting

scholarly journals Some factors affecting silage fermentation. 1. Influence of laceration and storage temperature.

1959 ◽  
Vol 7 (2) ◽  
pp. 134-137
Author(s):  
G.W. Wieringa
Keyword(s):  
Lactic Acid ◽  
Dry Matter ◽  
Storage Temperature ◽  
Matter Content ◽  
Dry Matter Content ◽  
Factors Affecting ◽  
Silage Fermentation ◽  
Higher Temperature ◽  
Lower Temperature ◽  
And Storage

In laboratory-scale ensiling experiments [See Abs. 602] it was shown that lactic-acid bacteria developed more rapidly in silage made from crushed grass than in silage made from grass chopped into 5-cm. lengths. In further experiments using grass of high-protein and low dry-matter content, crushed and ensiled at 20 or 30 degrees C., or uncrushed grass ensiled at 30 degrees G. with 1, 2, 3 or 4% of added molasses, good silage was produced only where 4% molasses or the lower temperature was used. Butyric-acid bacteria developed best at the higher temperature.-R.B. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Esmer İneklerde Somatik Hücre Sayısı ve Bazı Çiğ Süt Parametreleri Arasındaki İlişkilerin Belirlenmesi

2014 ◽  
Vol 2 (5) ◽  
pp. 220
Author(s):  
Aziz Şahin ◽  
Muzaffer Kaşıkcı
Keyword(s):  
Dry Matter ◽  
Milk Composition ◽  
Matter Content ◽  
Standard Errors ◽  
Dry Matter Content ◽  
Brown Swiss ◽  
Milk Samples ◽  
Upper Limit ◽  
The One ◽  
The Relationship

The aim of the present research was to determine the relationship between somatic cell count (SCC) and milk composition. Milk samples were collected in November and May in 2012. In the study, 128 milk samples from Brown Swiss cattle, divided into two groups. They were arranged from low score (≤500 000cell/ml) to high score (>500 000cell/ml) according to the Turkish Food Codex upper limit. The averages of SCC were determined as 10.444±0.073cells/ml for first group and 10.820±0.088cells/ml for second group, respectively. In the one group dry matter, non fat dry matter, fat, protein, lactose levels and standard errors were determined as 13.3±0.60%, 8.3±0.21%, 4.5±0.61%, 3.0±0.14% and 4.7±0.07%, respectively. The other group same traits were calculated 13.7±0.17%, 7.9±0.10%, 5.8±0.14%, 3.0±0.06% and 4.1±0.05%, respectively. Significant correlations were found between SCC and non fat dry matter (r=-0.109) protein (r=0.145), lactose (r=-0.490) in the second group. But, non significant correlations were determined between SCC and dry matter, non fat dry matter, fat, protein and lactose in the first group. As a result, increasing of the number of somatic cells, milk, lactose, protein, and fat-free dry matter content was determined to be significantly affected.

Chemical composition of clamped and baled grass silages harvested in England and Wales and relationships between dry matter content, pH and volatile N

1999 ◽  
Vol 132 (2) ◽  
pp. 163-172 ◽  
Author(s):  
M. FIELD ◽  
D. WILMAN ◽  
D. J. C. JONES
Keyword(s):  
Chemical Composition ◽  
Crude Protein ◽  
Dry Matter ◽  
Matter Content ◽  
Dry Matter Content ◽  
Total N ◽  
England And Wales ◽  
Straight Line ◽  
The Mean ◽  
The Relationship

The paper reports a study of the chemical composition of 25400 grass silages produced in England and Wales, of which 1040 were from the period 1961–63, 17900 (15480 clamped and 2420 baled) were from 1982–88 and 6460 (5640 clamped and 820 baled) were from 1992–93. A sample of each silage had been analysed for dry matter (DM), pH, crude protein (CP) and volatile N and in most cases for ash.The baled silages were drier on average than the clamped silages, with a wider spread of DM contents. The clamped silages with the lowest pH on average were those with a DM content of c. 240 g/kg; clamped silages wetter than this were progressively higher in pH with reduction in DM content; clamped and baled silages drier than 240 g/kg were progressively higher in pH with increase in DM content, up to pH 5·9 in baled silages of 580 g DM/kg. At a given DM content pH was on average 0·6 units higher in baled than in clamped silages. The ash content of baled silages was similar to that of clamped silages. There was an increase in the mean CP content of clamped silages between 1961–63 and 1992–93 and a reduction in the proportion of CP which was volatile. The relationship between DM and volatile N as a proportion of total N was a curve rather than a straight line, with the steepest part of the curve at the lower end of the DM range. The wet silages harvested in 1961–63 were particularly high in volatile N. At a given DM content in the range 170–320 g/kg, volatile N was rather higher in baled than in clamped silages in both 1982–88 and 1992–93. Clamped silages with a DM content of at least 250 g/kg and baled silages with a DM content of at least 310 g/kg were typically well preserved in the sense of having <100 g volatile N/kg total N.

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