scholarly journals The practicalities of managing cultivar change

1996 ◽  
Vol 6 ◽  
pp. 25-27
Author(s):  
Dave Allen
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
White Clover ◽  
Trifolium Repens ◽  
Crop Management ◽  
Management Systems ◽  
Trial And Error ◽  
Base Management ◽  
Trifolium Repens L

Ten years experience from trial-and-error plus some advice, has led to the development of successful base management systems for white clover cultivar-change. These systems are capable of modification according to site and season to maximise seed returns and have reached the point where white clover is now my safest crop. This paper considers crop management requirements necessary from the 'change' decision, some years before inception, through to harvested seed yield. Keywords: crop management, cultivar-change requirements, harvest, seed production, sowing technology, Trifolium repens L., white clover

SEED YIELD COMPONENTS IN WHITE CLOVER

1979 ◽  
Vol 59 (3) ◽  
pp. 713-715 ◽  
Author(s):  
D. M. HUXLEY ◽  
V. C. BRINK ◽  
G. W. EATON
Keyword(s):  
Seed Size ◽  
Seed Yield ◽  
White Clover ◽  
Trifolium Repens ◽  
Yield Components ◽  
Yield Component ◽  
Seed Yield Components ◽  
Significant Yield ◽  
Trifolium Repens L

Components of seed yield were studied in white clover (Trifolium repens L.). Head number and seed size were the major components of yield. Seeds per head was not a significant yield component and was independent of head number.

Current issues of white clover (Trifolium repens L.) breeding, seed production and import substitution programs in Russia

2019 ◽  
Author(s):  
В. Золотарев ◽  
Н. Переправо
Keyword(s):  
Seed Production ◽  
White Clover ◽  
Trifolium Repens ◽  
Import Substitution ◽  
Temperate Climate ◽  
Biological Traits ◽  
Forage Production ◽  
State Register ◽  
Trifolium Repens L ◽  
Clover Seed

Среди многолетних трав клевер ползучий (Trifolium repens L.) является одним из лучших бобовых компонентов для создания культурных луговых и пастбищных агрофитоценозов в районах с умеренным климатом. На основе биологических особенностей клевера ползучего показана эффективность использования этой культуры для лугопастбищного кормопроизводства страны. Дан краткий анализ опыта возделывания клевера ползучего за рубежом. Показано значение хозяйственно полезных признаков сортов на эффективность их использования в травосмесях. Приведён материал по ботанической классификации разновидностей клевера ползучего и особенностям хозяйственного использования сортов разных морфотипов. Показана различная эффективность импортных и отечественных сортов клевера при их возделывании в почвенно-климатических условиях России. В настоящее время в Государственном реестре селекционных достижений, допущенных к использованию на территории РФ, зарегистрировано 27 сортов клевера ползучего, из них девять (33) отечественной селекции. Актуализирована необходимость усиления селекционной работы по выведению новых сортов, адаптированных к разнообразным почвенно-климатическим условиям и определённым режимам пастьбы. На основании этого обозначены направления селекции. Высокий рыночный спрос вызывает необходимость организации товарного семеноводства клевера ползучего сортов отечественной селекции. Установлено, что основной объём семян завозится из-за рубежа. Однако сорта зарубежной селекции мало приспособлены для произрастания в континентальном климате России. В статье в ретроспективе показано состояние и перспективы семеноводства клевера ползучего в России, включая систему воспроизводства его семян. Представлена научно обоснованная потребность в необходимых объёмах производства посевного материала на разных этапах репродуцирования для обеспечения лугопастбищного кормопроизводства. Для существенного увеличения сборов семян клевера ползучего предложено широко внедрять в производство сортовые посевы при оптимальных технологиях их выращивания, что позволит раскрыть потенциальные возможности каждого сорта в конкретных почвенно-климатических условиях и повысить урожайность семян в 23 раза. White clover (Trifolium repens L.) is one of the best perennial legume components for grassland and pasture ecosystems in regions with temperate climate. This report describes the effectiveness of this crop in forage production basing on its biological traits. It presents the experiment on clover cultivation abroad. The influence of economically important traits is shown on clover performance in grass mixtures. The article includes white clover botanical classification and cultivation methods of different morphotypes. Performances of foreign and domestic varieties were tested under Russian environment. Currently State Register for varieties accepted for cultivation in Russia lists 27 white clover varieties, and nine of them (33) are domestic. It is important to work further on breeding of new clover varieties adapted to various conditions. There is a high demand for white clover seeds of domestic origin. The main part of white clover comes from abroad. However, such varieties poorly grow under Russian climate. This paper shows the state and perspectives of white clover seed production in Russia. When producing grassland forage efficient seed production of this crop is of great importance. Introduction of white clover varieties to particular regions is a way to stimulate its seed production using optimal cultivation techniques.

The influence of environment on seed production capacity in white clover (Trifolium repens L.). I. Controlled environment studies

1961 ◽  
Vol 12 (2) ◽  
pp. 227 ◽  
Author(s):  
RG Thomas
Keyword(s):  
Seed Production ◽  
White Clover ◽  
Trifolium Repens ◽  
Production Capacity ◽  
Pollen Sterility ◽  
Day Length ◽  
Controlled Environment ◽  
Ovule Number ◽  
Trifolium Repens L ◽  
High Level

Ramets of New Zealand Government Stock white clover (Trifolium repens L.) were grown in all combinations of 18-, 14-, and 10-hr photoperiods at constant temperatures of 10, 20, and 30°C. Inflorescence initiation, inflorescence height, number of florets per inflorescence, floret size, ovule number, and pollen fertility were all strongly influenced by environment. Greatest inflorescence initiation occurred in long days at high temperatures, in which conditions, also, the ratio of peduncle to petiole length was highest. Long days and low temperatures led to maximal floret number per inflorescence, floret size, and ovule number per floret. Pollen sterility, as measured by percentage of aborted grains, was little affected by day length but a high level of sterility was induced by growth at 10°C. The relative importance of these factors and the interactions between them in determining seed production capacity are discussed.

scholarly journals Response to selection for seed yield in six white clover cultivars

2004 ◽  
pp. 103-110 ◽  
Author(s):  
K.H. Widdup ◽  
D.R. Woodfield ◽  
I.J. Baird ◽  
P.T.P. Clifford
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
White Clover ◽  
Trifolium Repens ◽  
Leaf Size ◽  
Fourth Generation ◽  
Selection Strategy ◽  
Flowering Pattern ◽  
Selection For ◽  
The Impact

The successful commercialisation of agronomically superior white clover (Trifolium repens) cultivars is dependent on their seed production potential. Field trials were established in 2000 and repeated in 2003 to determine the impact of selection for increased seed yield. The seed yield of the pre-release cultivar (the base population prior to selection for seed yield and cultivar release, representing generation 0) was compared with the field Nucleus generation of the released cultivar (second generation after selection for seed yield, representing generation 2) and the Basic seed generation (the fourth generation after selection for seed yield, representing generation 4), in six recent cultivars (Grasslands Kopu II, Grasslands Challenge, NuSiral, Grasslands Sustain, Grasslands Demand and Grasslands Prestige). The Nucleus and Basic generations had consistently higher seed yield than the pre-release generation for all cultivars. These increases in seed yield were associated with increases in inflorescence density (inflorescences/m2) and to a lesser extent with increased seed yield/inflorescence. Changes were also evident in flowering pattern with four of the six cultivars having a sharper flowering peak following selection. This improved uniformity was also evident through reduced variability in leaf size of the Nucleus generation compared to the pre-release generation. Grasslands Kopu II had the highest seed yields which were associated with moderately high inflorescence density in combination with high seed yield/ inflorescence. The selection strategy used in the final phase of the development of these cultivars has proven successful in increasing seed yield through refining flowering pattern and production while maintaining the morphology and uniformity of the new cultivar. Keywords: cultivars, genetic improvement, seed production, Trifolium repens, white clover

Grasslands Trophy — a new white clover (Trifolium repens L.) cultivar with tolerance of summer moisture stress

2007 ◽  
Vol 47 (1) ◽  
pp. 110 ◽  
Author(s):  
J. F. Ayres ◽  
J. R. Caradus ◽  
R. D. Murison ◽  
L. A. Lane ◽  
D. R. Woodfield
Keyword(s):  
Seed Yield ◽  
White Clover ◽  
Trifolium Repens ◽  
Leaf Size ◽  
Moisture Stress ◽  
Yield Potential ◽  
Annual Rainfall ◽  
Progeny Testing ◽  
Eastern Australia ◽  
Trifolium Repens L

A breeding project has developed a new synthetic white clover (Trifolium repens L.) cultivar, Grasslands Trophy, that possesses tolerance of summer moisture stress in dryland pasture environments in the 850–1250 mm average annual rainfall temperate perennial pasture zone in eastern Australia. The breeding strategy used to develop Grasslands Trophy was an in situ breeding cycle for: (i) identifying and selecting superior genotypes, (ii) crossing elite germplasm and (iii) progeny testing derived breeding lines for the expression of key agronomic and grazing value traits. The primary selection criteria were early vigour, herbage yield, persistence and seed yield potential. Parental selection was also applied for seed yield, uniformity of leaf size, uniform flowering pattern and freedom from disease and virus symptoms. Grasslands Trophy is medium–large in leaf size with stable leaf size, combines intermediate stolon density with intermediate stolon thickness, and expresses high stolon survival and strong autumn regrowth following summer moisture stress. Grasslands Trophy has mid-season flowering maturity, intensive flowering prolificacy and high seed yield capability. Agronomic results from trials in northern New South Wales and New Zealand indicate that Grasslands Trophy has broad adaptation, expresses high summer and winter growth activity, and is reliably persistent for at least 4 years.

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