Seed production of semi‐natural grasslands: Amount and variability in an unfertilized upright brome and a fertilized tall oat‐grass meadow

2020 ◽  
Vol 75 (4) ◽  
pp. 409-423
Author(s):  
Michele Scotton
Keyword(s):  
Seed Production ◽  
Natural Grasslands ◽  
Grass Meadow

scholarly journals Effects of Fertilisation on Grass and Forb Gamic Reproduction in Semi-natural Grasslands

2021 ◽  
Author(s):  
Michele Scotton ◽  
Valentina Rossetti
Keyword(s):  
Seed Production ◽  
Shoot Density ◽  
Maturation Stage ◽  
Vegetation Changes ◽  
Variable Effect ◽  
Grassland Species ◽  
Grass Seed ◽  
Natural Grasslands ◽  
Soil Eutrophication ◽  
Viable Seeds

Abstract Studying the effects of fertilisation on the seed production of grassland species can help understand the vegetation changes and biodiversity losses due to soil eutrophication. On a temperate hay-meadow, the seed production of fifteen grasses and seventeen forbs was studied under three fertilisation treatments: 0-0-0, 0-54-108 and 192-108-216 kg N, P2O5 and K2O respectively, per year. Fertile shoots collected at the seed maturation stage were analysed for all main traits of the gamic reproduction. On average, forbs produced more ovules and viable seeds per shoot (199 and 65, respectively) than grasses (112 and 35, respectively). Fertilisation increased the number of inflorescences per shoot in both grasses and forbs and had a limited but variable effect on germinability and viability in the two functional groups: viability increased in grasses but often decreased in forbs. This pattern resulted in 55% and 11% increases in viable seed production in grasses and forbs, respectively. At the higher level of fertilisation, shoot density was positively related to the number of viable seeds per shoot in grasses and to the seed size in forbs. Higher grass seed dormancy likely allowed for later grass seed germination in autumn when vegetation cover was low, contributing to the dominance of a few light-seeded nutrient-demanding grasses and poor forb number in fertilised meadows.

scholarly journals Effects of fertilisation on grass and forb gamic reproduction in semi-natural grasslands

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Michele Scotton ◽  
Valentina Rossetti
Keyword(s):  
Seed Production ◽  
Soil Nutrient ◽  
Shoot Density ◽  
Maturation Stage ◽  
Variable Effect ◽  
Grassland Species ◽  
Natural Grasslands ◽  
Soil Eutrophication ◽  
Viable Seeds ◽  
The Relationship

AbstractStudying the effects of fertilisation on the seed production of grassland species can help understand the vegetation changes and biodiversity losses due to soil eutrophication. The seed production of fifteen grasses and seventeen forbs from a temperate hay meadow was studied under three fertilisation treatments: 0-0-0, 0-54-108 and 192-108-216 kg N, P2O5 and K2O respectively, per year. Fertile shoots collected at the seed maturation stage were analysed for all main traits of the gamic reproduction. On average, forbs produced more ovules and viable seeds per shoot (199 and 65, respectively) than grasses (112 and 35, respectively). Fertilisation increased the number of inflorescences per shoot in both grasses and forbs and had a limited but variable effect on germinability and viability in the two functional groups: viability increased in grasses but often decreased in forbs. This pattern resulted in 55% and 11% increases in viable seed production in grasses and forbs, respectively. At the higher level of fertilisation, shoot density was positively related to the number of viable seeds per shoot in grasses and to the seed size in forbs. These results highlight that the traits of the gamic reproduction can contribute to explain the relationship between soil nutrient richness and grassland species composition and richness.

scholarly journals The effect of dominant species on numbers and agę structure of Iris sibirica L. population on blue moor-grass meadow in southern Poland

2011 ◽  
Vol 76 (2) ◽  
pp. 165-173 ◽  
Author(s):  
Kinga Kostrakiewicz
Keyword(s):  
Seed Production ◽  
Age Structure ◽  
Vegetative Propagation ◽  
Dominant Species ◽  
Floristic Composition ◽  
Field Observations ◽  
Grass Meadow ◽  
High Level ◽  
Two Populations ◽  
Clonal Species

Two populations of <em>Iris sibirica</em>, a clonal species protected by law in Poland, occurring in patches of <em>Molinietum caeruleae</em>, of similar floristic composition although with different dominant species, were studied. In the Stanisławice locality, species with a high competitive potential prevailed, contrary to the Opatkowice locality, where the species of low competitive potential dominated. It was established that vegetative propagation ensures the continued presence of populations in both localities, although the proximity of plants with high competitive potential limits the vegetative propagation of ramet clusters of <em>Iris sibirica</em>. Despite the high level of seed production, the recruitment of seedlings in both patches is possible only in artificially created gaps. The field observations support the conclusion that creating gaps allowing for germination of seeds and development of seedlings, as well as eliminating expansive neighbours allowing proliferation of ramet clusters of <em>Iris sibirica</em>, is an affective way of protecting populations of this species.

Some insects affecting Penstemon seed production

2012 ◽  
Vol 13 (2) ◽  
pp. 107-111
Author(s):  
R. Hammon ◽  
M. Franklin
Keyword(s):  
Seed Production

PRIMING AS THE FACTOR OF INCREASE OF EFFICIENCY SEED PRODUCTION OF BIRDSFOOT TREFOIL

2020 ◽  
Author(s):  
Vladimir Zolotarev
Keyword(s):  
Seed Production ◽  
Characteristic Property ◽  
Seed Priming ◽  
Lotus Corniculatus ◽  
Birdsfoot Trefoil ◽  
Germination Energy ◽  
Field Germination

A characteristic property of legumes is the formation of hard-stone seeds. To use such seeds for sowing, it is necessary to carry out measures to increase their seeding indicators. The article provides an overview of methods of pre-sowing preparation of seeds, priming (Seed Priming). The harvest of Birdsfoot trefoil (Lotus corniculatus L.) can contain up to 90% or more hard-stone seeds. Mechanical priming of hard-stone seeds of Birdsfoot trefoil increases their germination energy and field germination.

Onion sets as planting material for seed production of three cultivars in Uruguay

2016 ◽  
Vol 44 (3) ◽  
pp. 500-513
Author(s):  
S. Peluffo ◽  
H. González Idiarte ◽  
A. Borges ◽  
J. Arboleya ◽  
G.A. Galván
Keyword(s):  
Seed Production ◽  
Planting Material

ПоражениесеменныхрастенийредисагрибомAlbugocandidaприпервичномсеменоводствевМосковскойобласти

2019 ◽  
Author(s):  
A.N. Khovrin ◽  
D.A. Yanaeva
Keyword(s):  
Seed Production ◽  
Seed Plants ◽  
Albugo Candida ◽  
Generative Phase

В статье описаны симптомы поражения семенных растений редиса A. candida, дана оценка ряда сортов с разной устойчивостью к A. candida. Описаны способы борьбы с этим заболеванием при элитном семеноводстве редиса. В результате двулетней оценки образцов питомника размножения выявлено, что есть сортовая специфика устойчивости к Albugo candida. Более склонен к поражению в генеративную фазу развития сорт Кармен, наиболее устойчив к патогену сорт Меркадо.The symptoms of A. candida on seed plants radish are described a number of varieties with different resistance to A. candida are evaluated. The methods of combating of this disease in elite seed production of radish are described. As a result of twoyear evaluation of breeding nursery samples it was revealed that there is varietal specificity of resistance to A. candida. The Carmen cultivar is more prone to disease in the generative phase, the most resistant to the pathogen is Mercado cultivar.

Оригинальное семеноводство овощных корнеплодных культур в Московской области

2018 ◽  
Author(s):  
A  Khovrin ◽  
M  Ibragimbekov ◽  
R  Bagrov
Keyword(s):  
Species Composition ◽  
Seed Production ◽  
Moscow Region ◽  
Seed Plants ◽  
Pests And Diseases ◽  
Root Crops ◽  
Seed Growing ◽  
In Cells

Даны результаты оригинального первичного семеноводства корнеплодных культур в изоляторах в селекционно-семеноводческом центре агрохолдинга «Поиск» (Раменский район Московской области). Описаны технологические особенности процесса семеноводства, представлен видовой состав болезней и вредителей семенных растений в условиях исследований.The results of the original primary seed growing of root crops in cells at breeding and seed production centre of Poisk Agro Holding (Ramensky district, Moscow region) are given. Technological peculiarities of the process of seed production, species composition of pests and diseases of seed plants in terms of research are presented.

Ground control and state of elite potato seed breeding in the Central region of Russia and adjacent regions according to its data

2020 ◽  
Author(s):  
S.E. Mikhalin S.E. ◽  
Keyword(s):  
Seed Production ◽  
Central Region ◽  
The State ◽  
Ground Control ◽  
Potato Seed ◽  
Potato Diseases

The article sets out information on the conduct of soil control of the potato elite, provides information on the state of elite seed production of potatoes in the Central region of Russia according to the data of soil control - which regions participated in its implementation, how many samples and varieties of potatoes were provided for soil control in different years, what were the main varieties, which potato diseases were taken into account.

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