THE INFLUENCE OF SEED SIZE AND SEEDING RATE ON YIELD AND YIELD COMPONENTS OF BARLEY

1963 ◽  
Vol 43 (3) ◽  
pp. 330-337 ◽  
Author(s):  
Ahmet Demirlicakmak ◽  
M. L. Kaufmann ◽  
L. P. V. Johnson
Keyword(s):  
Seed Size ◽  
Yield Components ◽  
Field Experiments ◽  
Yield Response ◽  
Seeding Rate ◽  
Kernel Weights ◽  
Yield And Yield Components ◽  
Poor Indicator ◽  
Small Seed ◽  
Size Interaction

Field experiments with three seed sizes and three seeding rates of each of three barley varieties were conducted in 1959 and 1960 at Edmonton and Lacombe, Alberta. Data were obtained on emergence, culm counts, grain yields, and 1000-kernel weights. Although there was no effect of seed size on emergence, the culm counts and yields were highest for large seed and lowest for small seed over all rates, varieties, and tests. The differences between yields from large and small seed decreased slightly as the seeding rate increased, but the seeding-rate × seed-size interaction was not statistically significant. There were varietal differences in yield response to seeding rates. It was, therefore, concluded that seeding rates in test plots should conform to those used in farming practice. The rate of seeding had a significant influence on 1000-kernel weights. The lowest rate produced the heaviest kernels and the highest rate produced the lightest kernels in each of four tests. Tillering capacity alone was a poor indicator of resulting yields. Results from further experiments, involving four seed categories of nine varieties in two tests, corroborated the above findings.

EFFECT OF PLANT DENSITY ON YIELD AND COMPONENTS OF YIELD OF FABA BEAN

1987 ◽  
Vol 67 (1) ◽  
pp. 1-10 ◽  
Author(s):  
R. J. GRAF ◽  
G. G. ROWLAND
Keyword(s):  
Vicia Faba ◽  
Faba Bean ◽  
Yield Components ◽  
Field Experiments ◽  
Plant Density ◽  
Broad Bean ◽  
Yield Response ◽  
Seeding Rate ◽  
Product Price ◽  
Primary Yield

Field experiments using two Vicia faba L. cultivars, Outlook faba bean and Chinese broad bean, were grown at six densities (13, 25, 38, 50, 63 and 75 plants m−2) at two locations in Saskatchewan for 2 yr. A diminishing yield response to density was observed over this range of densities, with optimal economic seeding densities attained at 38 plants m−2. For the larger-seeded Chinese broad bean, simulations indicated that a lower density of 25 plants m−2 was adequate if the seed cost approached twice that of the product price. Density effects were highly significant (P < 0.01) for all yield components except seed weight in Chinese broad bean and seeds per pod in both cultivars. Of the primary yield components, pods per plant exhibited the greatest sensitivity to changes in plant density, with Outlook faba bean being affected to a much greater extent. The number of pods per pod-bearing node was the major determinant of yield and yield stability in the highly indeterminate Outlook faba bean. The importance of pods per pod-bearing node was reduced in the more determinate Chinese broad bean, where podded nodes per plant showed greater sensitivity to plant density changes. It is suggested that efforts to produce a more determinate cultivar by reducing the number of podded nodes per plant may result in a concomitant stabilization of pods per pod-bearing node.Key words: Vicia faba, yield components, plant density, faba bean, seeding rate

CROP-WEED COMPETITION STUDIES IN FABA BEAN (Vicia faba L.) UNDER RAINFED CONDITIONS

2001 ◽  
Vol 49 (3) ◽  
pp. 299-303 ◽  
Author(s):  
A. M. Tawaha ◽  
M. A. Turk
Keyword(s):  
Vicia Faba ◽  
Faba Bean ◽  
Yield Components ◽  
Field Experiments ◽  
Maximum Yield ◽  
Weed Competition ◽  
Growing Seasons ◽  
Yield And Yield Components ◽  
Vicia Faba L ◽  
Crop Weed Competition

Field experiments were conducted during the two growing seasons of 1999 and 2000 at the research farm of the Jordan University of Science and Technology (JUST) to study the effect of the time of weed removal on the yield and yield components of faba bean (Vicia faba L.). Removing weeds from 25 to 75 days after crop sowing led to significantly larger yields than on plots which were not weeded. Maximum yield was obtained in both years when weeds were removed thrice at 25, 50 and 75 days after crop sowing.

scholarly journals Response of irrigated sunflower (Helianthus annuus L.) hybrids to nitrogen fertilization: growth, yield and yield components

2011 ◽  
Vol 50 (No. 5) ◽  
pp. 205-211 ◽  
Author(s):  
H. Özer ◽  
T. Polat ◽  
E. Öztürk
Keyword(s):  
Helianthus Annuus ◽  
Nitrogen Fertilization ◽  
Yield Components ◽  
Growth Yield ◽  
N Fertilization ◽  
Yield Response ◽  
Sufficient Information ◽  
Helianthus Annuus L ◽  
Application Rates ◽  
Yield And Yield Components

N fertilization has a substantial influence on sunflower (Helianthus annuus L.) seed yield and quality. It was also well established that high-yielding sunflower hybrids had more N requirement than old cultivars such as open-pollinated ones. However, in Turkey, no sufficient information regarding the response of new developed oilseed sunflower hybrids to nitrogen fertilization under irrigated conditions. Therefore, a 2-year study was conducted to determine the effects of nitrogen application rates on the growth, yield, and yield components of two oilseed sunflower hybrids (AS-508 and Super 25) under irrigated conditions. In this study, all plant parameters were significantly influenced by applied nitrogen fertilizer rates. Yield response to nitrogen rates was positive and linear. Our research data indicated that under irrigated conditions N rate of 120 kg/ha was adequate for sunflower production in this region.

EFFECT OF RATE AND DATE OF SEEDING ON YIELD AND YIELD COMPONENTS OF TWO WINTER WHEAT CULTIVARS GROWN IN ONTARIO

1979 ◽  
Vol 59 (4) ◽  
pp. 939-943 ◽  
Author(s):  
A. E. SMID ◽  
R. C. JENKINSON
Keyword(s):  
Winter Wheat ◽  
Yield Components ◽  
Test Weight ◽  
Yield Reduction ◽  
Wheat Cultivars ◽  
Seeding Rate ◽  
Yield And Yield Components ◽  
Winter Wheat Cultivars

Two cultivars of soft white winter wheat, Fredrick and Yorkstar, were sown at rates of 34, 67, 101, 134 and 168 kg/ha on or near 24 Sept., 9 Oct. and 23 Oct. in each of the 3 yr 1973–1975, at Ridgetown, Ontario. Highest net yields were obtained with rate of seeding 134 kg/ha. Seeding rate did not affect lodging. Yield per hectare and spikes per hectare were positively correlated while kernels per spike and spikes per hectare were negatively correlated. However, as the rate of seeding was increased, the increase in the number of spikes per hectare was greater than the accompanying decrease in kernels per spike, resulting in a net overall increase in yield. Highest yields of Fredrick were obtained near 9 Oct. and those of Yorkstar near 24 Sept. Yields decreased more rapidly with delayed seeding when seeding rates were less than 134 kg/ha, especially with Yorkstar. Test weight of Yorkstar was low, especially when sown late. Fredrick yielded 3–25% more than Yorkstar. A delay in seeding beyond 9 Oct. resulted in a yield reduction of 23 kg/ha/day. Fredrick should be sown instead of Yorkstar when seeding is delayed beyond recommended dates of seeding.

Size doesn’t matter: The effects of seed size and seeding rate on injury by root maggots (Delia spp., Diptera: Anthomyiidae) to canola (Brassica rapa L. and B. napus L.)

2006 ◽  
Vol 86 (3) ◽  
pp. 907-909 ◽  
Author(s):  
J. J. Soroka ◽  
R. H. Elliott
Keyword(s):  
Key Words ◽  
Seed Size ◽  
Brassica Rapa ◽  
Root Diameter ◽  
Seeding Rate ◽  
Small Seed ◽  
Root Maggot

In 16 experiments at two locations over six years, seed size had no effect on feeding levels by crucifer-feeding root maggots (Delia spp.) in Brassica rapa nor in B. napus. Root maggot injury in B. rapa declined as seeding rates increased. Damage to plants grown from small seed increased as root diameter increased. Key words: Canola, Delia spp., root maggot injury, seeding rate, seed size, root diameter

EFFECT OF DATES AND RATES OF SOWING ON YIELD AND YIELD COMPONENTS OF NARBON VETCH UNDER SEMI-ARID CONDITIONS

2001 ◽  
Vol 49 (1) ◽  
pp. 103-105 ◽  
Author(s):  
A. M. Tawaha ◽  
M. A. Turk
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Yield Components ◽  
Field Experiments ◽  
Grain Weight ◽  
Arid Conditions ◽  
Yield And Yield Components ◽  
1000 Grain Weight ◽  
Semi Arid ◽  
Northern Jordan

Field experiments were conducted during the winter seasons of 1998–1999 and 1999–2000 at Houfa in northern Jordan, to study the effect of the date and rate of sowing on the yield and yield components of narbon vetch (Vicia narbonensis L.). Progressive delays in sowing beyond 1 st January led to yield reductions of 11.1 and 17.9 at successive 15-day intervals. Plant height, pods stem –1, stems m –2 and 1000-grain weight followed the same trend as the yield. Grain yield was not significantly affected by the sowing rate.

Floret survival in wheat: significance of the time of floret initiation relative to terminal spikelet formation

1982 ◽  
Vol 98 (2) ◽  
pp. 257-268 ◽  
Author(s):  
E. E. Whingwiri ◽  
W. R. Stern
Keyword(s):  
Triticum Aestivum ◽  
Yield Components ◽  
Field Experiments ◽  
Treatment Time ◽  
Vascular System ◽  
Sowing Date ◽  
Nitrogen Application ◽  
Yield And Yield Components ◽  
Individual Grains ◽  
Initiation Period

SUMMARYWheat (Triticum aestivum L.) cv. Gamenya was grown in a Mediterranean type environment in two separate field experiments, to determine the effects of nitrogen application and date of seeding on floret survival. One treatment, intermediate in nitrogen level and sowing date, was common in both experiments. Rates and durations of spikelet initiation and durations of the floret initiation period were estimated. At maturity, yield and yield components were measured and occurrence of individual grains at each floret position on odd-numbered spikelets were recorded. The time of floret initiation relative to terminal spikelet formation and the subsequent occurrence of grain were examined.Florets developed first in spikelets 5-13 and last in spikelet 1. Added nitrogen hastened the initiation of florets but did not affect the number initiated; it also increased the numbers of grains per spikelet. In the last sowing date treatment, time to floret initiation decreased, but the sequence of floret initiation was unaffected.Numbers of florets and grains on tillers were less than on main shoots. Only about 28% of all florets initiated developed into grain.The main conclusion was that the florets which initiated before the terminal spikelet formed grain and those that initiated afterwards did not; we accordingly postulate that the vascular system between the rachis and the floret develops as the floret is initiated, but that after terminal spikelet formation, this is inhibited and further grains then fail to develop.

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