scholarly journals Influence of weather conditions during the pre-vegetation period on productivity and yield qualities of soft spring wheat seeds

2019 ◽  
Vol 20 (5) ◽  
pp. 437-446
Author(s):  
O. S. Amunova
Keyword(s):  
Seed Germination ◽  
Spring Wheat ◽  
Field Tests ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Reproductive Period ◽  
Average Yield ◽  
Seed Formation ◽  
Yield Structure ◽  
Seminal Roots

Eleven genotypes of soft spring wheat were studied in a series of field and laboratory experiments in 2014 - 2018. The laboratory test included accounting for seed germination and assessing the physiological parameters of seedlings (number of seminal roots, dry matter mass of roots and shoots and their ratio (RSR index)). The field tests included phenological observa-tions, assessment of genotypes by productivity and average yield. The average yield of wheat during the years of study was 1.93-4.92 t/ha and depended on weather conditions during the period of grain formation. The trait “1000-grain mass” was formed under the influence of the genotype (68.1%), the portion of influence of weather conditions was 11.8%. It has been established that the duration of the reproductive period of soft spring wheat in the Kirov region should be at least 40 days. Reducing the duration of the reproductive period leads to a decrease in seed germination capacity. Seeds the formation and development of which took place at the optimum temperature of 16 ºС, by germination spent the most part of seed reserve substances for the development of the aboveground part of the plant (RSR index = 0.70). Under these conditions, the varieties with a lower root index were characterized by high values of the elements of yield structure. At the increased average daily air temperature (by 2-4 oC), seeds that could germinate with a significantly higher number of seminal roots (6.6-9.0%) developed on the maternal plants. During the germination of such seeds, the plastic substances distributed evenly between the shoots and seminal roots (RSR index = 0.94-0.98). The increased influx of assimilates to root system of seedlings could be explained by the fact that the process of seed formation on the maternal plants took place under conditions close to stressful and the adapted seeds spent more reserve substances for root development.

scholarly journals Польова схожість насіння та збереженість рослин квасолі залежно від норми висіву насіння

2018 ◽  
pp. 30-36 ◽  
Author(s):  
А. О. Рожков ◽  
О. К. Труш
Keyword(s):  
Seed Germination ◽  
Considerable Increase ◽  
Gradual Increase ◽  
Plant Conservation ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Short Supply ◽  
Field Germination ◽  
Maximum Quantity ◽  
Seed Sowing

Висвітлено результати трирічних досліджень щодо впливу норм висіву на польову схожість насіння, збереженість та кількість рослин перед збиранням квасолі звичайної різних за морфо-біотипом сортів. У дослідах визначено закономірності впливу норм висіву насіння на зміну цих показників у роки з різними погодними умовами веґетаційного періоду. Встановлено, що польова схожість насіння досліджуваних сортів квасолі за різних норм висіву була фактично на одному рівні. Більшою мірою на мінливість показників польової схожості насіння квасолі впливали погодні умови під час його проростання. Збереженість рослин до кінця веґетації більшою мірою залежала від норми висіву. За поступового її підвищення відмічалася закономірність більшого зниження показників збереженості рослин. Максимальне зниження показників збереженості рослин квасолі всіх сортів відмічалося в разі підвищення норми висіву від 600 до 700 тис. шт./га – на 6,2–6,8 %. У менш сприятливих погодних умовах 2015 і 2016 рр. максимальна кількість рослин перед збиранням була на варіантах норми висіву насіння 600 тис. шт./га. У ці роки підвищення норми висіву до 700 тис. шт./га не забезпечувало істотного збільшення кількості рослин квасолі перед збиранням. У сприятливіших погодних умовах 2017 р. найбільша кількість рослин всіх сортів була на варіантах максимальної норми висіву насіння – 700 тис. шт./га. Водночас ця прибавка, порівняно з нормою висіву 600 тис. шт./га, не перевищувала 5,0 %. The results of three year research concerning the influence of seed sowing rates on field seed germination, conservation and quantity of plants before harvesting common beans varities which are different according to the morphobiotype were elucidated. The influence power of seed sowing rates on the changeableness of these indices during the years of different weather conditions in vegetation period was determined. It was ascertained that field seed germination of haricot beans varieties under studying according to different seed sowing rates was on the same level. Weather conditions influenced the changeableness of the indices in field germination of haricot beans seeds most of all at the beginning of seed germination. The plants’ conservation depended on sowing rate mainly till the vegetation end. The gradual increase of seed sowing rate caused the considerable decrease of plant conservation indices. In particular, the increase of sowing rate from 300 to 400 thousand pcs/ha caused the decrease of plants conservation by average 1.2 %, and the increase of seed sowing rate from 600 to 700 thousand pcs/ha – by 6.5 %. This appropriateness was marked in all the varieties during all the years of the research. Panna variety was the best one among the varieties under studying concerning the plants conservation indices. Under more favourable weather conditions of growing the field germination of this variety was not higher than that of Pervomaiska and Dokuchaievska ones. But under conditions of moisture short supply, high temperature during germination this variety had an advantage. So, before harvesting the conservation of Panna varieties plants on all the variants of seed sowing rate was not lower than 67.0 %, while this index was lower than 60.0 % for Pervomaiska and Dokuchaievska varieties. Owing to higher indices of plants conservation for Panna variety during years of unfavorable weather conditions for seed germination, the plants quantity of this variety was higher than that of other ones when harvested. The maximum quantity indices of plants, before harvesting was noticed in 2015. In particular, before harvesting the plants quantity of Pervomais’ka, Dokuchaievs’ka and Panna varieties amounted average to 22.0, 23.0, 28.5 pcs/m2 correspondingly to seed sowing rates, according to the HIP05 the effect of this factor – 1.1 pcs/m2. The increase of seed sowing rate caused the gradual increase of plants quantity before harvesting. But the considerable increase of plants quantity before harvesting when seed sowing rate rose from 600 to 700 thousand pcs/ha took place only in 2017 when this increase was within HIP05 in 2015 and 2016. So, the increase of seed sowing rate in haricot beans varieties under studying from 600 to 700 pcs/ha can ensure the increase of plants quantity before harvesting only during the years of favourable weather conditions. According to the plants conservation indices, the plants quantity before harvesting under the influence of weather conditions was more stable concerning Panna variety. In particular, according to the seed sowing rates the maximum divergence scope of plants quantity in Dokuchaievs’ka, Pervomais’ka and Panna varieties amounted average 19.2, 14.1, and 11.4 % correspondingly during the years of research. Under the weather conditions in 2015 and 2016 before harvesting the maximum plants  quantity was on the variants of seed sowing rate amounting 600 thousand pcs/ha. The increase of sowing rate to 700 thousand pcs/ha did not ensure a considerable increase of haricot beans plants quantity before harvesting during these years. In 2017 the maximum quantity of haricot beans plants of all the varieties was on the variants of maximum seed sowing rate – 700 thousand pcs/ha. At the same time this increase did not exceed 5 % in comparison with the sowing rate amounting 600 thousand pcs/ha.

scholarly journals Влияние посевных агрегатов для прямого посева, нормы высева семян и дозы внесения минеральных удобрений на урожайность яровой пшеницы в засушливой степи Алтайского края

2017 ◽  
Vol 7 (4) ◽  
pp. 145-150 ◽  
Author(s):  
V. I. Belyaev ◽  
N. V. Rudev ◽  
T. Maynel ◽  
S. A. Kozhanov ◽  
L. V. Sokolova ◽  
...  
Keyword(s):  
Spring Wheat ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Fertilizer Application ◽  
Application Rate ◽  
Seeding Rate ◽  
Joint Application ◽  
Fertilizer Application Rate ◽  
Mode Of Application ◽  
Moisture Supply

<p>The paper presents the results of a three-year field experiment on the influence of different sowing options on the yield of spring wheat. Sowing units for direct seeding with different types of working elements (lance-foot-SZS-2.1 and chisel at Condor 12000 and Sead Hawk 1200L) were considered as variable factors, as well as the seeding rate of spring wheat seeds, the fertilizer application rate during sowing, and their mode of application (with seeds and separately). The obtained results revealed an ambiguous nature of the influence of factors on the yield under different conditions of vegetation. Evaluation of the significance of the factors studied for three years of research showed that the conditions of the period of vegetation had the greatest impact on the yield. In second place - the rate of sowing seeds, and the third - the dose of fertilization. Thus, the variability of weather conditions over the years of research led to a change in yield almost twice. The increase in the sowing rate within the studied limits (102-151 kg/ha) reduced the yield by an average of 3.6 kg/ha, and the increase in the fertilizer application rate from 0 to 134 kg/ha raised the yield by 1.6 kg/ha. Moreover, the joint application of seeds and fertilizers using the "No-Till" technology (sowing by Condor) gave a significant effect under the conditions of high moisture supply of the vegetation period - a yield increase of 7.2 kg/ha on average, and separate application of seeds and fertilizers (sowing by Seed Hawk) - in conditions of low moisture supply of vegetation - an increase in the yield of an average of 4.2 kg/ha. The application of direct sowing of SZS-2.1 gave an effect, in comparison with Condor, only in arid conditions (+ 2.6 kg/ha).</p>

scholarly journals Weed infestation of soft spring wheat crops depending on the soil tillage system

2020 ◽  
Vol 50 (3) ◽  
pp. 16-27
Author(s):  
A. L. Pakul ◽  
N. A. Lapshinov ◽  
V. N. Pakul ◽  
G. V. Bozhanova
Keyword(s):  
Spring Wheat ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Soil Tillage ◽  
System Control ◽  
Tillage Systems ◽  
Wheat Seedlings ◽  
Tillage System ◽  
Weed Infestation ◽  
The Impact

The paper presents the results of the study on the influence of various tillage systems on the weed infestation of soft spring wheat of the Siberian Alliance variety. The study was carried out in a long-term stationary experiment (20152019) preceded by bare and green-manured fallow (rapeseed, melilot) in Kemerovo region. The soil of the experimental plot is classified as leached, medium-textured, medium-humus, heavy-loam chernozem. The following soil tillage systems were studied: deep moldboard, deep combined, minimum combined and minimum moldboard. Weather conditions during the research period were varied. Insufficient water supply during the first vegetation period of soft spring wheat (seedlings – leaf-tube formation) was noted in 2015-2017, with HTC (hydrothermal coefficient) being from 0.37 to 0.56. Excessive water content was observed in 2018 (HTC = 2.41) and moderate hydration – in 2019 (HTC = 1.12). Weed infestation was different in the conditions of each year. The impact of the soil tillage system on the number of weeds during the growing season of common spring wheat accounted for 21.6-90.4%, and their share in the total aboveground mass of the phytocenosis was 39.9-68.3%. The segetal flora in soft spring wheat crops is represented by monocotyledonous and dicotyledonous species with all the studied tillage systems. The highest density of weed vegetation during the tillering phase of soft spring wheat was recorded with deep moldboard soil tillage system (control). A reduction in weed infestation by 2.3 times compared to the control was noted with minimum moldboard soil tillage system preceded by bare fallow, 1.6 times – preceded by green-manured fallow with rapeseed, and 1.7 times – preceded by green-manured fallow with melilot. The same trend was observed in the proportion of weeds in the total aboveground mass of the phytocenosis during the wax ripeness phase of soft spring wheat with deep moldboard tillage system (4.3%), deep combined (3.9), minimum combined (4.1), minimum moldboard (2.6%).

scholarly journals Genetic and statistical analysis of the combiniting ability of spring wheat varieties for drought resistance in the juvenile period of development

2020 ◽  
Vol 21 (3) ◽  
pp. 253-262
Author(s):  
O. S. Amunova ◽  
L. V. Volkova
Keyword(s):  
Seed Germination ◽  
Spring Wheat ◽  
Drought Resistance ◽  
Sucrose Solution ◽  
Juvenile Period ◽  
Wheat Varieties ◽  
Average Value ◽  
Root Shoot Ratio ◽  
Seminal Roots ◽  
Response To Stress

Eight original forms and 16 hybrid populations of F2 spring wheat of the 2019 yield were studied to determine the level of drought resistance by sprouting seeds in a sucrose solution during 5 days. The effect of artificially created drought on seedlings was very significant: the overall decrease in seed germination in parents and hybrids was 16.0 and 16.7 %, respectively, the number of seminal roots – 19.3 and 17.4 %, the weight of the seedling – 67.1 and 70.2 %. Under stressful conditions, the root-shoot ratio (RSR index) increased on average from 0.92 to 1.42 in varieties and from 0.86 to 1.68 in hybrids. High varietal specificity of both absolute values of traits in the control and the experiment, as well as the response to stress, was noted. By the number of seminal roots in the control, the NOS Norko variety (Germany) had the advantage, and by the weight of the seedling – Karabalykskaya 91 (Kazakhstan). Significantly high values of the RSR index in the control and the experiment were observed in the Jahuara F-77 variety (Mexico). The Kitt variety (USA) was characterized by lack of response to drought of seed germination. The Jahuara F-77 (Mexico) and Klein Vencedor (Argentina) varieties were characterized by lack of response to drought by the number of seminal roots. Based on the analysis of the general and specific combinational ability of parent varieties, 8 promising hybrid combinations were identified. A high heterosis effect, expressed by an increase in the average value of the trait in hybrids relative to parents, was observed in most hybrid combinations by the parameter "seedling mass", in the combination of Erythrospermum 2945 x NOS Norko - by the number of seminal roots. The influence of maternal and paternal components as well, as their interaction, on the germination of F2 hybrids seeds was insignificant (the inheritance coefficient h02 = 0.04...0.22). The contribution of parent varieties to other parameters in the control was significantly high (Ffact > F05), except for the influence of paternal forms on the weight of the seedling. The values of the general heritability coefficients of the number of roots and RSR under normal conditions (h02 = 0.80...0.82) indicate that selection by these parameters can be highly effective. In artificially created drought, the most efficient will be the selection by the "dry weight of seedling" parameter, since the contribution of maternal components in the number of seminal roots and paternal components to the RSR index is insignificant.

scholarly journals INFLUENCE OF SPRING WHEAT VARIETIES ON GROWTH AND DEVELOPMENT OF PLANTS

2018 ◽  
Vol 13 (3) ◽  
pp. 35-38
Author(s):  
Николай Малов ◽  
Nikolay Malov
Keyword(s):  
Spring Wheat ◽  
Growth And Development ◽  
Cumulative Effect ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Mineral Fertilizers ◽  
Potential Yield ◽  
Wheat Varieties ◽  
Vegetative Period ◽  
Phenological Phases

The article deals with the growth and development of spring wheat plants, depending on the variety in the conditions of the Chuvash Republic. The rate and rhythm of development of field crops, the time of onset of phenological phases and the duration of the vegetation period generally determine the hereditary nature of plant varieties and the cumulative effect of all factors of plant life. A variety is a biological foundation on which all other elements of high productivity are built and one of the main factors of stable production of spring wheat grain. Strong and valuable varieties of spring wheat with a high potential yield, good responsiveness to mineral fertilizers and changes in agrotechnics during cultivation, resistant to unfavorable weather conditions during the vegetative period of plants, lodging, diseases, forming strong grain quality are used for cultivation. In this case, the variety is considered as the cheapest and available means of increasing the productivity of plants. In our studies for all the years of research, the onset of phenological phases of development depended on both varietal features, meteorological conditions during the vegetative period of plants and the biological characteristics of the varieties under study.

Relevant issues of land reclamation development in Non-black Earth area

2020 ◽  
pp. 5-13
Author(s):  
Georgiy Gulyuk ◽  
Aleksey Ivanov ◽  
Yuri Yanko
Keyword(s):  
Winter Wheat ◽  
Rural Areas ◽  
Land Reclamation ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Nature Management ◽  
Negative Consequences ◽  
Forage Crops ◽  
Edible Roots ◽  
Social Economic Development

Current situation and agricultural management on the non-black earth area of Russia arebeing gradually worsen by the negative natural factors such as a significant increase of weather based climatic abnormal risks, deterioration of agro-meliorative conditions of agricultural lands because of colonization by tree and shrubbery vegetation and secondary bog formation, hidden degradation of soil fertility. When combined with functional loss of ameliorative complex and meliorative systems amortization, regional agriculture adaptation possibilities were rapidly limited. Production shortfall due no abnormal weather conditions for particular field crops was 19…48% during last five years, level of business realization of bioclimatic potential on a field was decreased by 7…12%.The complete realization of regional agricultural adaptive potential to weather based climatic changes and limitation of greenhouse gases emissions is possible on a basis of regeneration ofalll functions and aspects of ameliorative complex management. Toward this goal the coordinated actions of federal and regional management of Agricultural Complex, Scientific and Educational institutions, project foundations and managers are needed in a relation to human resources, scientific and regulatory supply. Any incomplete treatment in these fields inherent in visual negative consequences for food security and social economic development of rural areas of non-black earth zones not only at the current historical moment, but in a future also. Fundamental influence of solving of these problems deserves to scientific supply of innovative ameliorative complex, renewal of which should be based on principals of resources and energy preservation, nature management, computerization and digitalization management. During a long term research it was established that increase of average vegetation period temperature by lоСhas increased productivity of winter wheat, barley and summer wheat in average on 0,7 tons per ha, winter wheat and oat on 0,4 tons per ha, potatoes – 8,2 tons per ha, edible roots-6,4 tons per ha, cabbage 9,8 tons per ha, dry basis of herbage of multi and one age grasses–0,5 and 0,7 tons per ha. Increase of СО2 Concentration from 0,35 to 0,45% during last twenty years contributed into grow of yield in regional agriculture which can be estimated as 0,3 tons per ha per measure; searching remedy for agroclimatical risks decreasing production became drainage and irrigation systems (decrease 3…5 times);new method of reclamation of abandoned areas with transformation of biomass of tree and shrubbery vegetation into biochar makes it possible to decrease СО2 emissions up to times and get an adverse balance of СО2;secondary reclamation of lands covered by trees and shrubbery on area of 22ha used for vegetables and area of 37ha used for forage crops could supply a farmer with work and revenue sufficient for maintenance of one child what is on the major facts of population declaim in rural areas.

Irrigation regime and water consumption of potatoes in the Republic of Bashkortostan, depending on the reclamation condition of lands

2020 ◽  
Vol 0 (6) ◽  
pp. 13-19
Author(s):  
Guzel Gumerova ◽  
Georgiy Gulyuk ◽  
Dmitry Kucher ◽  
Anatoly Shuravilin ◽  
Elena Piven
Keyword(s):  
Water Consumption ◽  
Weather Conditions ◽  
Growing Season ◽  
Vegetation Period ◽  
Forest Steppe ◽  
Total Water ◽  
Total Water Consumption ◽  
Republic Of Bashkortostan ◽  
Irrigated Lands ◽  
The Republic

Data of long-term researches (2015–2018) in southern forest-steppe zone of the Republic of Bashkortostan, is justified theoretically and experimentally the mode of irrigation of potatoes on leached chernozems of unsatisfactory, satisfactory and good ameliorative condition of irrigated lands. For the growing periods of potatoes with different heat and moisture supply, the number of watering, the timing of their implementation, irrigation and irrigation norms are established. On lands with unsatisfactory meliorative state the number of irrigation depending on weather conditions of potato vegetation period varied from 0 to 3 (1.5 on average) with average irrigation norm – 990 m3/ha. With satisfactory meliorative state of lands the number of irrigation on average increased from 0 to 4 (2.3 on average) with irrigation norm – 1305 m3/ha. On lands with good meliorative state the number of irrigation was the highest – from 1 to 5 (3 on average) with average irrigation irrigation norm is 1653 m3/ha. It was noted that in the dry periods of potato vegetation the greatest number of watering was carried out (3–5 watering), and in the wet periods (2017) watering was not carried out except for the area with a good reclamation state, where only one irrigation was carried out by the norm of 550 m3/ha. Water consumption of potato was studied in dynamics as a whole during the growing season and the months of the growing season depending on weather conditions of vegetation period and land reclamation condition of irrigated lands, as well as in the control (without irrigation). The lowest total water consumption was in the area without irrigation and averaged 226.8 mm. In irrigated areas, its values increased to 319-353.4 mm. The average daily water consumption varied from 2.12 to 3.3 mm. The highest rates of potato water consumption were observed in June and July, and the lowest – in May and August. In the total water consumption of potatoes on the site without irrigation, the largest share was occupied by atmospheric precipitation and in addition to them the arrival of moisture from the soil. Irrigation water was used in irrigated areas along with precipitation, the share of which was 30.2–46.1 %.

Optimum harvest date of maize for biogas and silage purposes

2009 ◽  
Vol 57 (2) ◽  
pp. 119-125
Author(s):  
G. Hadi
Keyword(s):  
Dry Matter ◽  
Biogas Production ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Dry Mass ◽  
Matter Content ◽  
Harvest Date ◽  
Dry Matter Content ◽  
Dry Matter Yield ◽  
Vegetative Organs

The dry matter and moisture contents of the aboveground vegetative organs and kernels of four maize hybrids were studied in Martonvásár at five harvest dates, with four replications per hybrid. The dry matter yield per hectare of the kernels and other plant organs were investigated in order to obtain data on the optimum date of harvest for the purposes of biogas and silage production.It was found that the dry mass of the aboveground vegetative organs, both individually and in total, did not increase after silking. During the last third of the ripening period, however, a significant reduction in the dry matter content was sometimes observed as a function of the length of the vegetation period. The data suggest that, with the exception of extreme weather conditions or an extremely long vegetation period, the maximum dry matter yield could be expected to range from 22–42%, depending on the vegetation period of the variety. The harvest date should be chosen to give a kernel moisture content of above 35% for biogas production and below 35% for silage production. In this phenophase most varieties mature when the stalks are still green, so it is unlikely that transport costs can be reduced by waiting for the vegetative mass to dry.

Prospects of spring wheat cultivation in the conditions of arid Volga region

2020 ◽  
pp. 28-33
Author(s):  
Valery Genadievich Popov ◽  
Andrey Vladimirovich Panfilov ◽  
Yuriy Vyacheslavovich Bondarenko ◽  
Konstantin Mikhailovich Doronin ◽  
Evgeny Nikolaevih Martynov ◽  
...  
Keyword(s):  
Spring Wheat ◽  
Soil Layer ◽  
Weather Conditions ◽  
Volga Region ◽  
Mineral Fertilizers ◽  
Climate Conditions ◽  
Wheat Cultivation ◽  
Forest Belts ◽  
Clear Differentiation ◽  
The Impact

The article analyzes the experience of the impact of the system of forest belts and mineral fertilizers on the yield of spring wheat, including on irrigated lands. Vegetation irrigation is designed to maintain the humidity of the active soil layer from germination to maturation at the lower level of the optimum-70-75%, and in the phases of tubulation-earing - flowering - 75-80% NV. However, due to the large differences in zones and microzones of soil and climate conditions and due to the weather conditions of individual years, wheat irrigation regimes require a clear differentiation. In the Volga region in the dry autumn rainfalls give the norm of 800-1000 m3/ha, and in saline soils – 1000-1300 and 3-4 vegetation irrigation at tillering, phases of booting, earing and grain formation the norm 600-650 m3/ha. the impact of the system of forest belts, mineral fertilizers on the yield of spring wheat is closely tied to the formation of microclimate at different distances from forest edges.

Factors affecting red-osier dogwood seed germination

1992 ◽  
Vol 70 (5) ◽  
pp. 1012-1016 ◽  
Author(s):  
S. N. Acharya ◽  
C. B. Chu ◽  
R. Hermesh ◽  
G. B. Schaalje
Keyword(s):  
Seed Germination ◽  
Germination Percentage ◽  
Collection Site ◽  
Moisture Condition ◽  
Seed Formation ◽  
Factors Affecting ◽  
Year Effect ◽  
Wide Range ◽  
Cornus Stolonifera ◽  
Moisture Conditions

Seeds from 55 populations of native Alberta red-osier dogwood (Cornus stolonifera Michx.) were collected over 2 years (1984 and 1985) to determine the range of variability for seed germination and the effect of ecoregion and moisture conditions in the collection sites on this trait. Each year the unscarified seeds were stored at 3 °C for 30 days, stratified at 3 °C for an additional 30 days and then incubated on an 8 h light: 16 h dark cycle at a temperature of 25:10 °C (light:dark) for germination. A wide range of germination percentages was observed among populations collected in any 1 year. However, the variability was not due to the ecoregion or moisture condition of the collection site. Germination percentage of populations collected in 1984 and 1985 formed five and seven groups, respectively. A study involving eight sites that were common to 1984, 1985, and 1986 revealed a significant effect of population on seed germination. This population effect was not obscured by the combined effects of year, precipitation, temperature, and seed size. The year effect was significant only when population was used as a covariate. Precipitation during seed formation significantly influenced germination performance even after adjustments were made for population and year. Seed germination in red-osier dogwood appears to be influenced by the population from which the seeds are collected and by yearly environmental fluctuations. Therefore, germination studies in this species must include seeds from diverse populations collected over several years. Key words: red-osier dogwood, Cornus stolonifera Michx., germination, population, environment.

Sign in / Sign up

Export Citation Format

Share Document