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Observations on tillering in cultivars of phalaris under rotational grazing in a year with a summer-autumn drought


, : Observations on tillering in cultivars of phalaris under rotational grazing in a year with a summer-autumn drought. Australian Journal of Agricultural Research 48(4): 467-476

Changes in tiller numbers, timing of stem elongation, and tiller survival under summer moisture stress were measured in phalaris (Phalaris aquatica L.) pastures rotationally grazed at 15 wethers/ha during a study of the survival and productivity of a semi-winter-dormant cultivar (Australian) compared with 3 winter-active cultivars (Sirosa, Holdfast, Perla Retainer). The semi-winter-dormant cultivar maintained higher tiller numbers per plant and per area than the 3 winter-active cultivars, was later in its reproductive stem development, and was capable of more new tillering early in spring, but could display higher rates of tiller death late in spring. Although stem elongation in Australian started later in 1990, it was no less synchronous than in the winter-active cultivars. However, Sirosa had a higher proportion of elongating tillers than Australian under very infrequent grazing in a supplementary experiment during 1991. Cultivars did not differ in the proportion of tillers that were decapitated during spring 1990. Perla Retainer displayed higher summer dormancy after rainfall in January 1991 and new tillers of Perla Retainer and Holdfast survived subsequent drought better than tillers of Australian. However, regeneration of the tiller population of Australian after drought ended was enhanced by and slightly higher propensity for tillering during July-September 1991. The results suggested that maintaining grazing pressure and frequency in late winter and early spring should enhance tiller survival and improve the resilience of phalaris to episodes of heavy spring grazing. Later reproductive development probably benefits grazing tolerance in semi-winter-dormant cultivars, but the value of selecting for this in winter-active phalaris is uncertain. In areas with harsh summers, higher summer dormancy is required for survival combined with a capacity for tiller survival should growth occur. However, unnecessarily high summer dormancy will reduce the growth of green herbage and, consequently, animal production.

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Kaukel E.; Sternowsky H.J.; Gaertner U., 1975: Infantile familial hyper tri glyceridemia defect in adenylate cyclase cyclic amp protein kinase tri glyceride lipase system. Pediatric Research 9(11): 866

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Trainor D.; Blair D.; Gegg C.; Kranig Brown D.; Gonzalez C.; Zepeda M.; Nelson N.; Shaw S., 1989: Identification of chlamydia trachomatis using a hybrid protection dna probe assay. Abstracts of the Annual Meeting of the American Society for Microbiology 89: 413

Fruhstorfer, H., 1910: Neue Agriasformen: A. godmani forma cyanecula und forma derufata nava. Entomologische Zeitschrift Stuttgart, 24 185

Astrand, H., 1967: Agricultural adjustment. The agricultural policy programme of the Agricultural Investigation Committee of 1960 (1960 ars jordbruksutredning) is examined in the light of the discussion after its publication in 1966. Special attention is paid to the goal of agricultural pol...

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Baylet R., 1980: Cerebro spinal meningitis at bamako mali 1969 1978 strategic modifications. There was a high incidence of lethal cerebrospinal meningitis (Neisseria meningitidis) at Bamako, Mali, from 1969-1978 in humans. Antimicrobials and vaccines to control this epidemiologically important disease were discussed.

Kritzman, M. G., 1943: Metabolism of amino acids and B1-avitaminosis. Kidney, muscle and brain of rats suffering from Bi-avitaminosis show a considerable decrease of the rate of transamination of glutamic acid. At the same time in kidney and liver a decrease of oxidative deamination of l-amino acids is observed; the...

Derse, D; Dorn, P; Dasilva, L; Martarano, L., 1990: Structure and expression of the equine infectious anemia virus transcriptional trans-activator (tat). Developments in biological standardization2(72): 39-48