Relationships between age and biomass of individual plants and seed production in two grazed tropical legumes. 2. Validation of models

2002 ◽  
Vol 53 (2) ◽  
pp. 107
Author(s):  
C. K. McDonald ◽  
R. M. Jones
Keyword(s):  
Seed Production ◽  
Research Station ◽  
Demographic Model ◽  
Legume Seed ◽  
Production Models ◽  
Tropical Legumes ◽  
Legume Plant ◽  
Grass Biomass ◽  
Predicted Values ◽  
Stylosanthes Scabra

Relationships predicting legume seed production from total legume biomass and from age and biomass of individual legume plants in a grazing trial at CSIRO Narayen Research Station, in south-eastern Queensland, were compared with observed soil seed measurements over 9 years. This was part of a larger project to develop a demographic model of tropical perennial forage legumes in grazed pastures. Suitable data were available from Chamaecrista rotundifolia–Cenchrus ciliaris pastures stocked at 0.54 and 1.09 head/ha and from Stylosanthes scabra– C. ciliaris pastures at 1.09 head/ha. Use of legume plant age and biomass, in conjunction with grass biomass (C. rotundifolia) or kg legume/head (S. scabra), to predict soil seed accounted for 87% (C. rotundifolia) and 77% (S. scabra) of the variation in observed values, and gave accurate and unbiased predictions. Prediction of soil seed from total legume biomass was better correlated with observed values for S. scabra (r2 = 0.72) than for C. rotundifolia(r2 = 0.63), but over-predicted values for S. scabraand under-predicted those for C. rotundifolia. The results highlight that, with C. ciliaris, the grass biomass needs to be kept below 3000 kg/ha to maintain a C. rotundifolia population. Similarly, the results indicate that biomass of S. scabra may need to be kept below 400 kg/head to avoid the possibility of S. scabra dominance, depending on the companion grass. Application of the seed production models in assessing the agronomic adaptation of these legumes and in predicting persistence of legumes and other species (e.g. weeds) is discussed.

THE IMPORTANCE OF BORAX IN LEGUME SEED PRODUCTION IN THE SOUTH

Soil Science ◽  
1944 ◽  
Vol 57 (1) ◽  
pp. 75-84 ◽  
Author(s):  
J. R. PILAND ◽  
C. F. IRELAND ◽  
H. M. REISENAUER ◽  
FIRMAN E. BEAR
Keyword(s):  
Seed Production ◽  
The South ◽  
Legume Seed

Assessment of Stylosanthes seed yield reduction caused by phytoplasma-associated diseases

2002 ◽  
Vol 42 (8) ◽  
pp. 1053 ◽  
Author(s):  
S. J. De La Rue ◽  
R. Hopkinson ◽  
K. S. Gibb
Keyword(s):  
Seed Yield ◽  
Reproductive Activity ◽  
Yield Reduction ◽  
Research Station ◽  
Initial Symptom ◽  
Symptom Expression ◽  
Yield Data ◽  
Leaf Disease ◽  
Significant Difference ◽  
Stylosanthes Scabra

The effect of Stylosanthes little leaf disease on Stylosanthes scabra cv. Seca seed yield was monitored over 2 consecutive seasons at Southedge Research Station in northern Queensland. The time of initial symptom expression was recorded during weekly assessments to determine what effect time of infection after planting had on seed yield. First flowering date was recorded to establish whether the developmental stage of the plant, as indicated by the onset of reproductive activity, at the time of symptom expression influenced the effect of Stylosanthes little leaf disease on yield. At the end of each season, both diseased and asymptomatic plants were harvested and seed yield determined. Seed yield data from the 1999 season showed that there was no significant difference between the mean yield of symptomatic plants, regardless of when they first showed symptoms, and that of asymptomatic plants. However, during the 2000 season plants that showed symptoms early in the season had a significantly lower seed yield than both asymptomatic plants and plants that became diseased later in the season. This decrease in productivity amounted to a yield loss of 98.8 and 56.5% when the plants showed symptoms at 79�and 110 days, respectively, after planting. If plants became diseased within 30 days of first flowering, they did not produce significant amounts of seed. Yield remained low even when the time between first flowering and initial symptom expression increased up to 60 days, after which yield was extremely variable but within the range of that observed for individual asymptomatic plants. It is concluded that Stylosanthes little leaf disease has little or no effect on seed yield if plants have been flowering for about 8 weeks before symptom expression.

scholarly journals Evaluation of French bean (Phaseolus vulgaris L.) genotypes for seed production

2014 ◽  
Vol 6 (2) ◽  
pp. 594-598
Author(s):  
R. Das ◽  
U. Thapa ◽  
S. Debnath ◽  
Y. A. Lyngdoh ◽  
D. Mallick
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Plant Morphology ◽  
French Bean ◽  
Point Of View ◽  
Research Station ◽  
Phaseolus Vulgaris L ◽  
Seed Vigour ◽  
Plant Vigour ◽  
Vigour Index

An experimental study was conducted during 2011/2012 and 2012/2013 at Horticulture Research Station, Mondouri, Bidhan Chandra Krishi Viswavidyalaya, Monhanpur, Nadia, West Bengal, India, to evaluate the performance of fourteen different bush type French bean genotypes for seed yield and to study varietal characterization based on plant morphology. The genotypes, studied under this experiment were namely, Abhay, Shillong Local-3, Arjun, Selection-9, Arka Anoop, Arka Komal, Badshah, Anupam, Arka Suvidha, Falguni, Sonali, Local, Victoria and Vaishnavi-264. From overall point of view of the outcome of the experiment, it has been revealed that genotype with relatively bolder seeds with more number of seeds per pod, and higher bearing capacity per plant generally gives higher seed yield. Among the genotypes under study, Arka Suvidha was the best one as it produced the highest seed yield (2180.92 kg/ha) and relatively good plant vigour and fairly high seed vigour index (2944.38). Falguni and Mohanpur Local also can be considered promising once for seed production point of view.

scholarly journals Legume seed production for sustainable seed supply and crop productivity: case of groundnut in Tanzania and Uganda

2020 ◽  
Vol 34 (4) ◽  
pp. 518-539 ◽  
Author(s):  
Essegbemon Akpo ◽  
Geoffrey Muricho ◽  
Gerald Alex Lukurugu ◽  
Hellen Opie ◽  
Chris O. Ojiewo ◽  
...  
Keyword(s):  
Seed Production ◽  
Crop Productivity ◽  
Legume Seed ◽  
Seed Supply

Trapping of larvae of the cattle tick Boophilus microplus by Stylosanthes scabra under grazing conditions

1989 ◽  
Vol 40 (6) ◽  
pp. 1301 ◽  
Author(s):  
LJ Wilson ◽  
RW Sutherst ◽  
JD Kerr
Keyword(s):  
Laboratory Tests ◽  
Seasonal Pattern ◽  
Tick Control ◽  
Boophilus Microplus ◽  
Cattle Tick ◽  
Research Station ◽  
Morphological Attributes ◽  
Control Programs ◽  
Per Se ◽  
Stylosanthes Scabra

Several varieties of the leguminous genus Stylosanthes have the capacity to trap larvae of the tick Boophilus microplus. This capacity was assessed for S. scabra plants collected from grazed fields at two locations, Brian Pastures Research Station and 'The Springs' in central Queensland. Morphological attributes which may affect the capacity of plants to trap tick larvae were recorded. In laboratory tests, plants collected from Brian Pastures trapped 27% of larvae in summer and 12% in winter, whilst plants from 'The Springs' trapped an average of 12%, with no seasonal pattern discernible. The percentage of branches which were sticky was the major determinant of a plant's capacity to trap ticks. Variation in stickiness per se was less important. Frost and burning temporarily reduced tick-trapping capacity, but after four months, burnt plants trapped a higher percentage of larvae than unburnt plants due to the production of sticky regrowth. The implication of the results for the use of S. scabra in tick control programs is discussed.

scholarly journals In situ assessment of Jatropha curcas germplasm under tropical dry forest conditions in Manabí-Ecuador

2020 ◽  
Vol 73 (3) ◽  
pp. 9273-9281
Author(s):  
Álvaro Cañadas-López ◽  
Diana Rade-Loor ◽  
Carlos Molina-Hidrovo
Keyword(s):  
Genetic Variability ◽  
Seed Production ◽  
Jatropha Curcas ◽  
Oil Content ◽  
Phenotypic Diversity ◽  
Dry Forest ◽  
Phenotypic Correlation ◽  
Research Station ◽  
Seed Length ◽  
Seed Width

Jatropha germplasm accessions need an assessment of their traits to evaluate the nature and magnitude of the genetic variability among accessions. The objective of this research was to evaluate the phenotypic behavior of 130 Jatropha curcas L. (Jatropha) accessions and the genetic variability of selected Jatropha accessions. The selected variables were assessed between 2008-2014 based on the number of fruits per tree (FP), the number of seeds per fruit (SpF), weight of 100 dry seeds (100SW), seed length (SL), seed width (SW), smallest deviation standard as regular seed production (RP), highest deviation standard as irregular seed production (IP), seed oil content (Oil), seed production in g per tree (SP). Correspondence Analysis techniques were also applied in selected elite Jatropha accessions. The genotypic and phenotypic correlation coefficient between seed length, seed width, 100-seed weight and oil content for selected Jatropha accessions were applied. Variance, genotypic and phenotypic coefficients of variation, heritability (broad-sense) and genetic advance were calculated for several Jatropha phenotypic characteristics. CP041, CP052, CP037, CP054, CP060, CP122, CP118, CP120, CP121 INIAP Jatropha accessions were selected basically for SP and FP. A high statistically significant correlation (genotypic and phenotypic) between seed length – seed width was obtained from the chosen Jatropha accessions. Genetic association in the characteristics of growth and production highlighted the low phenotypic diversity in the Jatropha Portoviejo Research Station (EEP) of the National Institute for Agricultural and Cattle Ranching Research (INIAP) germplasm bank. There is an urgent need to improve the germplasm resource by obtaining new accessions, mainly from countries considered as centers of origin of the species.

scholarly journals Possibilities Forage Legume Seed Production in Turkey

2017 ◽  
Vol 5 (5) ◽  
pp. 280-283
Author(s):  
Aybegün Ton ◽  
Adem Emin Anlarsal
Keyword(s):  
Seed Production ◽  
Forage Legume ◽  
Legume Seed

scholarly journals Effect of Planting Windows for Seed Production of Soybean (Glycine max L.) in off Season under Kaylan Karnataka Region

2020 ◽  
pp. 130-138
Author(s):  
K. Lokesh ◽  
. Basavegowda ◽  
Mallikarjun Reddy ◽  
. Siddaram ◽  
P. D. Suhas ◽  
...  
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Seed Quality ◽  
Agricultural Research ◽  
Research Station ◽  
Planting Time ◽  
Agricultural Research Station ◽  
Yield And Quality ◽  
Sowing Dates

Aim: To identify the best planting time for obtaining higher seed yield and quality of Soybean in off season. Study Design: Randomized completely block design (RCBD) Place and Duration of Study: Agricultural Research Station, Halladkere, Bidar, Karnataka between 2016 and 2017. Methodology: A field experiment was conducted at Agricultural Research Station, Halladkere, Bidar to find out the best off season planting time for quality seed production of Soybean. The certified seeds of soybean varieties, JS-335 and Dsb-21 were sown with recommended package of practices at appropriate field condition from November to February at every fortnight with a spacing of 30 cm X 10 cm. The quality parameters related to seed were carried out in the laboratory of seed science department. Further, soybean seeds were treated with fungicide (carbendazim 25% + mancozeb 75%) at the rate of 3 gram per kg of seeds. Results: From the present investigation, it was observed that among the different sowing dates, soybean varieties (JS 335 and DSb 21) sown during 1st fortnight of November recorded significantly higher plant growth parameters as well as seed yield followed by 2nd fortnight of November during off season. Further, climatic factors like rainfall, maximum and minimum temperature and relative humidity played a major role in the off season to produce higher seed yield and quality of Soybean. Conclusion: Among various sowing dates, November 1st Fortnight sowing resulted in highest seed yield with better seed quality in both cultivars (JS-335 and Dsb-21) of soybean.

scholarly journals Performance of Sweetpotato Foundation Seed after Incorporation into Commercial Operations in Louisiana

2010 ◽  
Vol 20 (6) ◽  
pp. 977-982 ◽  
Author(s):  
Christopher A. Clark ◽  
Tara P. Smith ◽  
Donald M. Ferrin ◽  
Arthur Q. Villordon
Keyword(s):  
Seed Production ◽  
Ipomoea Batatas ◽  
Seed Quality ◽  
The United States ◽  
Research Station ◽  
State University ◽  
Incidence Data ◽  
Louisiana State University ◽  
Virus Incidence ◽  
Foundation Seed

Because sweetpotato (Ipomoea batatas) is vegetatively propagated, viruses and mutations can accumulate readily, which can lead to cultivar decline. Sweetpotato foundation seed programs in the United States maintain the integrity of commercial seed stock by providing virus-tested (VT) foundation seed to commercial producers. A survey was conducted in Louisiana from 2007 to 2009 to examine the performance and quality of the foundation seed after it had been integrated into commercial sweetpotato operations. G1 seed [grown 1 year after virus therapy in the foundation seed production field at the Sweet Potato Research Station, Louisiana State University Agricultural Center (LSU AgCenter), at Chase, LA] was used as a reference to compare the yield and virus incidence of growers' generation 2 (G2) and generation 3 (G3) seed roots (grown in the growers' seed production fields 1 or 2 years following the year of foundation seed production). Although yields of plants grown from G2 and G3 seed were 86.3% and 86.1% for U.S. No. 1 and 83.3% and 86.0% for total marketable, respectively, compared with the yields from G1 seed, they were not significantly different. Yield and virus incidence data suggest that seed quality may vary from year to year and from location to location. Results from this study suggest that producers are realizing yield benefits by incorporating VT foundation seed into their production schemes, but further benefits could be attained if ways to reduce re-infection with viruses can be found.

Comparative productivity of some cultivars of subterranean clover (Trifolium subterraneum) in north-eastern Victoria

1968 ◽  
Vol 8 (30) ◽  
pp. 46
Author(s):  
IH Cameron ◽  
AA McGowan
Keyword(s):  
Seed Production ◽  
Dry Matter ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Research Station ◽  
Pasture Production ◽  
Wool Production ◽  
North Eastern ◽  
The Common ◽  
Clover Seed

Eight cultivars of subterranean clover (Trifolium subterraneum L.)-Yarloop, Burnley, Bacchus Marsh, Nangeela, Clare, Portugal, Chiltern Valley, and Mt. Barker-were compared in mowing experiments at the Rutherglen Research Station in north-eastern Victoria. All eight had similar total annual yields of dry matter, but all except Chiltern Valley outyielded Mt. Barker (the common district cultivar) in most winters. Yarloop, Burnley, and Bacchus Marsh grew best in winter. Of these, Burnley has most promise, being apparently more persistent than Bacchus Marsh, and having lower oestrogenic potency than Yarloop. There was no difference in greasy wool production from wethers run at five to the acre on Mt. Barker or Bacchus Marsh pastures, despite higher pasture production on the latter. Hay was cut in two seasons ; after feeding equal amounts to each group of sheep, there was a surplus of 20 cwt an acre in favour of the Bacchus Marsh pasture. Clover seed production, winter pasture growth, and sheep liveweights also favoured Bacchus Marsh.

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