Seasonal changes in dry matter distribution and herbage quality of Urochloa species in north-eastern Queensland

1990 ◽  
Vol 30 (4) ◽  
pp. 523 ◽  
Author(s):  
JG McIvor
Keyword(s):  
Seasonal Changes ◽  
Dry Matter ◽  
Green Leaf ◽  
In Vitro Digestibility ◽  
Matter Distribution ◽  
Moisture Index ◽  
Nitrogen And Phosphorus ◽  
Mixed Stands ◽  
Dry Matter Distribution ◽  
Herbage Quality

Seasonal changes in the dry matter distribution between green leaf, dry leaf, stem and infloresence, and the nitrogen and phosphorus concentrations and in vitro digestibility of these components, were measured in accessions of Urochloa mosambicensis and U. oligotricha growing at Lansdown, near Townsville, between 1979 and 1982. The grasses were grown in mixed stands with Stylosanthes cultivars and fertilised annually with superphosphate. U. oligotricha accessions were more leafy than U. mosambicensis accessions. In all accessions, the proportion of green leaf was high at the start of the growing season and then declined, usually to zero by the end of the dry season. The proportion of green leaf was closely related to water supply as indicated by a moisture index. The differences between accessions for chemical composition and digestibility were much smaller than the differences between sampling dates, and accessions did not differ markedly for herbage quality.

Seasonal changes in the growth, dry matter distribution and herbage quality of three native grasses in northern Queensland

1981 ◽  
Vol 21 (113) ◽  
pp. 600 ◽  
Author(s):  
JG McIvor
Keyword(s):  
Seasonal Changes ◽  
Dry Matter ◽  
Perennial Grasses ◽  
Green Leaf ◽  
In Vitro Digestibility ◽  
Matter Distribution ◽  
Nitrogen And Phosphorus ◽  
Dry Matter Distribution ◽  
Heteropogon Contortus

The growth of unfertilized native pasture was studied at two sites (Lansdown near Townsville and Redlands near Charters Towers) over a 30-month period. Seasonal changes in the dry matter distribution between green leaf, green stem, dry leaf, dry stem and inflorescence, and the nitrogen and phosphorus concentrations and in vitro digestibility of these components were measured in Chrysopogon fallax, Heteropogon contortus and Themeda australis. Maximum herbage yields ranged from 4000-6000 kg/ha at Lansdown and 1500-2000 kg/ha at Redlands with perennial grasses contributing over 90% of the herbage. There were large differences between the species in the pattern of dry matter distribution, with C. fallax having a higher proportion of leaf during most of the sampling period. The nitrogen and phosphorus concentrations and digestibility levels in the various plant components were usually similar in the three grasses but all showed large seasonal variations at both sites. Green leaf was the most nutritious component but even this was of too low a quality to support animal growth during part of the year.

Plasticity in growth and patterns of dry matter distribution of two genotypes of Trifolium repens grown in different environments of neighbours

1983 ◽  
Vol 61 (8) ◽  
pp. 2186-2194 ◽  
Author(s):  
Roy Turkington
Keyword(s):  
Trifolium Repens ◽  
Dry Matter ◽  
Poa Pratensis ◽  
Dactylis Glomerata ◽  
Hostile Environment ◽  
Matter Distribution ◽  
Dry Matter Distribution ◽  
Trade Off ◽  
Mobile Plant ◽  
Trifolium Repens L

Replicates of two genotypes of Trifolium repens L., collected from a Poa pratensis dominated sward and a Dactylis glomerata dominated sward, respectively, were grown in swards composed of various proportions of P. pratensis and D. glomerata. These swards represented a range of environments of neighbours; an increasing proportion of P. pratensis was considered as an increasingly alien environment for individuals of T. repens collected from the D. glomerata dominated site, and vice-versa for the individuals from the P. pratensis dominated site. The individuals of T. repens were harvested on five occasions over a period of 27 months. Both genotypes responded to increasingly alien environments by producing more inflorescences and by distributing proportionately more dry matter to inflorescence production. Some evidence is also presented which suggests that allocation to stolons and inflorescences are alternatives and the balance of the trade off is dependent on the advantages of possibly producing new, better adapted offspring from seed, against the chances of a wandering stolon encountering a less hostile environment. Results are discussed in the context of environmental alienness, a major source of which is the different relative proportions of neighbours. The various genotypes of organisms which a relatively mobile plant species encounters are a major source of this environmental, or biotic, alienness.

Growth responses of clonal lines of American sycamore grown under different intensities of nutrition

1971 ◽  
Vol 49 (3) ◽  
pp. 353-358 ◽  
Author(s):  
Klaus Steinbeck
Keyword(s):  
Dry Matter ◽  
Nutrient Concentration ◽  
Growing Season ◽  
Diameter Growth ◽  
Growth Responses ◽  
Matter Distribution ◽  
Dry Matter Distribution ◽  
Seasonal Peak ◽  
Matter Production ◽  
Clonal Lines

Four random clones of American sycamore supplied with four concentrations of Hoagland's solution differed in their response to and interacted with treatment as far as height and diameter growth and total dry matter production in the first growing season were concerned. Varying nutrient intensity did not affect the time of the seasonal peak of height and diameter growth; better growth was maintained subsequent to the seasonal peak at the higher concentrations, however. The proportions of the trees in terms of dry-matter distribution and branching characteristics changed with nutrient concentration.

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