scholarly journals Factors affecting the Mountain Hawk-Eagle reproduction under the cyclic fluctuation of Japanese Beech seed production

2014 ◽  
Vol 63 (2) ◽  
pp. 297-310
Author(s):  
Masahiro HAYAMA ◽  
Masatoshi YUI ◽  
Tadashi IMAI
Keyword(s):  
Seed Production ◽  
Japanese Beech ◽  
Factors Affecting ◽  
Cyclic Fluctuation

A Method of Measuring Pollinator Populations on Field Crops

1952 ◽  
Vol 84 (10) ◽  
pp. 314-316 ◽  
Author(s):  
M. V. Smith ◽  
G. F. Townsend
Keyword(s):  
Seed Production ◽  
Large Degree ◽  
Factors Affecting ◽  
Field Crops ◽  
Pollinating Insects ◽  
Pollinator Populations

The seed production of many field crops, and in particular of legumes, depends to a large degree upon the number of pollinating insects present in the field during the blooming period. A study of the various factors affecting seed production requires, among other things, a knowledge of the population of pollinating insects present, and a ready means of comparing pollinator populations from one field to another. To obtain this information some means must be employed to count and classify the pollinating insects in the field.

Factors affecting fruit and seed production of Paeonia ostii “Feng Dan”, an economically important oil tree

2021 ◽  
Vol 36 (2) ◽  
pp. 258-268
Author(s):  
Guo‐Xing Cao ◽  
Hong‐Qiang Lin ◽  
Yue‐Hong Cheng ◽  
Xie Wang
Keyword(s):  
Seed Production ◽  
Factors Affecting

FACTORS AFFECTING SCALE OF ENTERPRISE

1985 ◽  
Vol 2 ◽  
pp. 37-40
Author(s):  
Logan Freeman
Keyword(s):  
Seed Production ◽  
White Clover ◽  
Trifolium Repens ◽  
Factors Affecting ◽  
Alternative Crops ◽  
New Cultivars

White clover is undersown in the spring with wheat, barley and peas. Irrigation is used in order to achieve a heavy flowering in the white clover crop over one month. Three barley crops must be grown successively in some paddocks to eliminate yarrow. Lupins, peas and soybeans are alternative legumes to white clover, but white clover is still the preferred legume to grow, especially with new cultivars becoming available. Keywords: White clover, Trifolium repens, seed production, yarrow, alternative crops, overseas markets.

Studies of seed production in two Austrodanthonia grass cultivars

2002 ◽  
Vol 53 (11) ◽  
pp. 1197 ◽  
Author(s):  
G. M. Lodge
Keyword(s):  
Seed Germination ◽  
Seed Production ◽  
Early Stage ◽  
Early Flowering ◽  
Harvest Time ◽  
Flowering Stage ◽  
N Application ◽  
Factors Affecting ◽  
The Mean ◽  
Early Harvest

Studies were conducted in 1993–94 on 2 native grass cultivars, Austrodanthonia richardsonii (Link) H.P.�Linder (syn. Danthonia richardsonii Cashmore) cv. Taranna and A. bipartita (Link) H.P. Linder (syn. D. linkii Kunth) cv. Bunderra, to quantify the important morphological factors affecting seed production (as measured by seed weight, g/plant). Experiments also examined the influence of nitrogen (N) application and investigated the effects of time and method of harvest on seed production and subsequent germination. For both cultivars, inflorescence and floret number accounted for the highest proportion of the variation in seed production per plant (R2 = 0.873 and 0.686 for Taranna and Bunderra, respectively). Although N applied (0, 25, and 50 kg/ha) at the late vegetative or early flowering stage, or split applications at both times, had no significant effect (P > 0.05) on the seed production per plant of Taranna and Bunderra, further studies of N effects are required. In 1993 and 1994, time of inflorescence harvest and method of harvest had no significant effect on inflorescence number and seed production of Taranna and Bunderra and no significant effect on the subsequent germination of Bunderra seed. However, in 1993, harvesting at an early stage of flowering (10% of florets white and fluffy) reduced Taranna seed production by 17% compared with the mean and decreased (P < 0.05) seed germination by about 10%. In 1994, harvesting at early flowering (5% florets white and fluffy) reduced Taranna seed production by a mean of around 55% compared with harvesting at 50% maturity, and subsequent seed germination was also lower (P < 0.05) for the early harvest time. Application of 1 L/ha of paraquat (a.i. 200 g/L of paraquat dichloride) at mid-flowering to desiccate the crop in 1993 had no significant effect on the germination of Taranna and Bunderra caryopses. The implications of these data for commercial seed production are discussed.

Seed production and persistence of Carnamah and other early strains of Trifolium subterraneum in the wheatbelt of Western Australia

1967 ◽  
Vol 7 (24) ◽  
pp. 25 ◽  
Author(s):  
GB Taylor ◽  
RC Rossiter
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Western Australia ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Growing Season ◽  
Early Flowering ◽  
The Other ◽  
Factors Affecting ◽  
Seed Yields

Seed production and persistence of the Carnamah, Northam A, Dwalganup, and Geraldton strains of subterranean clover (Trifolium subterraneum L.) were examined in undefoliated swards in the wheatbelt of Western Australia. The early flowering characteristic of Carnamah was not always associated with higher seed yields. Only when there was a well-defined, early finish to the growing season, or when flowering was very much earlier in Carnamah (viz., following an early 'break' to the season), did this strain clearly outyield both Northam A and Geraldton. The seed yield of Dwalganup was generally inferior to that of the other strains. Factors affecting regeneration are discussed. Under low rainfall conditions, poorer germination-regulation of Carnamah, compared with Geraldton and Northam A, would be expected to result in poorer persistence unless offset by higher seed yields in the Carnamah strain.

Factors affecting germination and seed production ofEriochloa villosa

Weed Science ◽  
2000 ◽  
Vol 48 (6) ◽  
pp. 749-754 ◽  
Author(s):  
Iliya A. Bello ◽  
Harlene Hatterman-Valenti ◽  
Micheal D. K. Owen
Keyword(s):  
Seed Production ◽  
Factors Affecting

Factors Affecting Silverleaf Nightshade (Solanum elaeagnifolium) Germination

Weed Science ◽  
2012 ◽  
Vol 60 (1) ◽  
pp. 42-47 ◽  
Author(s):  
Rex Stanton ◽  
Hanwen Wu ◽  
Deirdre Lemerle
Keyword(s):  
Seed Production ◽  
Thermal Conditions ◽  
Control Program ◽  
Long Distance ◽  
Factors Affecting ◽  
Silverleaf Nightshade ◽  
Soil Seedbank ◽  
Buried Seed ◽  
Solanum Elaeagnifolium ◽  
Ph Range

Silverleaf nightshade is a widespread, deep-rooted, summer-growing perennial that significantly reduces production in Australian crop and pasture systems. It has an extensive root system, which competes both directly and indirectly with summer and winter pastures and crops through depletion of soil moisture and nutrients. Long-distance dispersal of seeds is an important mechanism for its spread and management. A range of experiments was conducted to determine the factors influencing seed production and seedbank dynamics. Seed production ranged from 1,814 to 2,945 m−2. Diurnally fluctuating temperatures of 25/15 C provided the optimal thermal conditions for germination, with germination not affected by light. Osmotic stress reduced germination, with no germination occurring at −1MPa. Germination was reduced to 5% at 160 mM NaCl, suggesting some salt sensitivity. Germination occurred over a pH range of 4 to 10, but declined with increasing acidity. Viability of buried seed declined to around 20% after 3 yr, with seed buried at 10 cm remaining the most viable. The prolonged seed persistence in the soil indicates a long-term control program is necessary for depleting the soil seedbank.

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