Spring defoliation of white clover seed crops. 2. Potential harvestable seed yield and seed yield components of contrasting white clover cultivars

1993 ◽  
Vol 48 (3) ◽  
pp. 310-316 ◽  
Author(s):  
A. H. MARSHALL ◽  
P. A. HOLLINGTON ◽  
D. H. HIDES
Keyword(s):  
Seed Yield ◽  
White Clover ◽  
Yield Components ◽  
Seed Yield Components ◽  
Clover Seed ◽  
Seed Crops

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.

Genotypic variation for seed yield components in white clover (Trifolium repens L.)

2000 ◽  
Vol 51 (6) ◽  
pp. 657 ◽  
Author(s):  
M. Z. Z. Jahufer ◽  
F. I. Gawler
Keyword(s):  
Seed Yield ◽  
White Clover ◽  
Yield Components ◽  
Early Stage ◽  
Genotypic Variation ◽  
Principal Component ◽  
Positive Association ◽  
Genotypic Correlation ◽  
Yield Attributes ◽  
Seed Yield Components

Seed yield is an important criterion that determines the commercial acceptability of new cultivars. Often, the seed yielding capacity of a forage cultivar is tested only in the final stages of its development. A more efficient strategy would be to screen and select plants for seed yield at an early stage of breeding. An important objective of the National White Clover Breeding Program based at the Agriculture Victoria Pastoral and Veterinary Institute, Hamilton, is to assess the genetic diversity for important morphological attributes among germplasm accessions. A set of 53 accessions, which included germplasm collected from Morocco and Tunisia and a range of commercial cultivars, was characterised for seed yield components. The seed yield components were number of ripe inflorescences, number of florets per ripe inflorescence, number of seeds per pod, floret size, and inflorescence height. Potential seed yield was estimated. The magnitude of genotypic variation, together with the accession mean repeatability estimates, indicated the presence of genetic variation among the 53 accessions for all attributes. Both phenotypic and genotypic correlation coefficients indicated a strong positive association between total number of ripe inflorescences and seed yield. There was also a positive phenotypic and genotypic correlation between seed yield and number of florets per inflorescence. Cluster analysis of the 53 accessions based on seed yield components resulted in the generation of 6 groups. Principal component analysis helped to identify 5 accessions that could be potentially useful in improving the seed yield of white clover germplasm selected for superior agronomic and herbage yield attributes.

scholarly journals The key to successful second year white clover seed crops

1996 ◽  
Vol 6 ◽  
pp. 40-40
Author(s):  
B.L. Mccloy ◽  
S.R. White
Keyword(s):  
Seed Yield ◽  
White Clover ◽  
Block Design ◽  
First Year ◽  
Flower Number ◽  
Mature Flower ◽  
Second Year ◽  
Clover Seed ◽  
Seed Crops ◽  
Rotary Type

In recent years there has been an increase in the number of white clover seed crops taken for a second harvest. Traditionally yields from second year crops are substantially lower than first year crops. A trial was established investigating techniques to increase yields in second year crops. The trial was located in a dryland crop of white clover (cv. Grasslands Demand) 4 km east of Methven, mid Canterbury. It involved 10 herbicide treatments and 8 'inter-row' treatments arranged in a split block design. Number of mature flower heads were recorded on all treatments at harvest as an indirect estimate of yield. Additionally, selected treatments were cut and collected using a rotary type mower, threshed, and machine dressed for direct estimates of seed yield. Flower number and machine dressed seed yield were significantly (P

scholarly journals Paclobutrazol and white clover seed production: a non-fulfilled potential

1996 ◽  
Vol 6 ◽  
pp. 35-39
Author(s):  
J.G. Hampton
Keyword(s):  
Seed Yield ◽  
White Clover ◽  
Unit Area ◽  
Variable Response ◽  
Reproductive Growth ◽  
Seed Yield Components ◽  
Vegetative And Reproductive Growth ◽  
Clover Seed ◽  
Yield Responses ◽  
Seed Increase

Seed yield in white clover depends largely on the number of ripe inflorescences per unit area, and the plant growth regulator paclobutrazol has been used in an attempt to both increase and concentrate inflorescence production, and hence increase seed yield. However results reported from both New Zealand and Europe have been inconsistent, with seed yield responses ranging from highly significant increases to no effects. The current high cost of the chemical ($1280/ha) requires a seed increase of over 300 kg/ha to ensure an economic return. Similarly no consistent effects of paclobutrazol on white clover vegetative and reproductive growth and development have been established. Possible reasons for this variable response of white clover to paclobutrazol application are presented and discussed. Keywords: inflorescence production, Parlay, reproductive growth, seed yield components, Trifolium repens, vegetative growth

Genetic variability and tradeoffs among reproductive traits in white clover (Trifolium repens)

1995 ◽  
Vol 73 (3) ◽  
pp. 505-511 ◽  
Author(s):  
B. Kahn ◽  
J. A. Silander Jr. ◽  
H. L. Reynolds ◽  
M. L. Cain
Keyword(s):  
Temporal Variation ◽  
Seed Yield ◽  
White Clover ◽  
Trifolium Repens ◽  
Yield Components ◽  
Seed Weight ◽  
Spatial And Temporal Variation ◽  
Phenotypic Correlation ◽  
Seed Yield Components ◽  
Reproductive Characters

There is much spatial and temporal variation for reproductive output in white clover (Trifolium repens L.), yet little is known about the control of this variation or whether there exist tradeoffs among components of seed yield. To examine these issues, seed yield components and vegetative biomass were measured on replicates of seven white clover genotypes planted in a common garden plot. Significant genetic differences among clones were found for biomass and for five of seven reproductive characters, including number of inflorescences, number of florets per inflorescence, number of fruits per infructescence, number of (late-maturing) seed per fruit, and seed weight in early-maturing fruits. Thus, there is considerable potential for natural or artificial selection to act on vegetative and reproductive characters in white clover. In addition to these genetic effects, we observed temporal variation for number of florets per inflorescence, number of fruits per infructescence, and seed weight in late-maturing fruits. Finally, analyses of phenotypic, genetic, and microenvironmental correlation coefficients revealed few pairs of traits with significant negative correlations. This suggests that few tradeoffs in resource allocation patterns existed for the phenotypic characters examined. Key words: Trifolium repens, genetic variation, seed yield components, tradeoffs, phenotypic correlation, genetic correlation.

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