The use of vegetation in locating solonetz soils in Queensland

The use of vegetation in determining soil characteristics is often fraught with errors, but in reconnaissance survey work as is carried out by the Bureau of Investigation any correlation between soil type and the vegetation which it carries is valuable in making a preliminary assessment of the possible utilization of the land. Species include "Sandalwood" Eremophila mitchelli and Bull-oak, Casuarina leuhmanni

Symposium: AGRICULTURAL EXPERIMENTS AND THEIR ECONOMIC SIGNIFICANCE (I)

Research and Development/Tech Change/Emerging Technologies,

Distribution of chlorides in the waters of the catchment of Macintyre Brook southern Queensland, and their effect on tobacco production

The main source of chloride in the system was identified as Treverton Creek and its tributaries, waters here containing in excess of 80 p.p.m. chloride. A perched water table of inferior quality probably feeds into Macintyre Brook near the tobacco-growing area, increasing chloride content to an average of 55 p.p.m. Springs of low-quality water also affect the chloride content of the main stream in places. The practical implications of a water supply containing more than 40 p.p.m. chloride for land use in the area are discussed

Caracterização Morfofisiológica e Anatômica de Paspalum urvillei (Steudel) Morphophysiological and Anatomic Characterization of Paspalum urvillei (Steudel)

Este trabalho foi conduzido com o objetivo de caracterizar a dinâmica de afilhamento e acúmulo de biomassa, a fenologia e os aspectos anatômicos de P. urvillei. O ensaio foi desenvolvido em Passo Fundo, Rio Grande do Sul, onde foram colhidas quinzenalmente seis plantas, em um delineamento completamente casualizado, entre 21/10/99 a 21/04/00. As épocas foram avaliadas por unidades de graus-dia (GD) de crescimento, por intermédio da soma das temperaturas médias diárias (temperatura basal = 0&ordm;C). As características anatômicas de folha e colmo foram observadas por cortes histológicos à mão livre. O material foi corado com fucsina-azul de Astra e montado em glicerina, entre lâmina e lamínula. Observou-se um máximo de 70 afilhos/planta, sendo 60% basilares; a área foliar atingiu até 7066 cm²/planta, com 250 folhas verdes/planta. A altura do dossel vegetativo manteve-se em 50 cm. O florescimento foi precoce e longo, sugerindo a necessidade de manejo para encurtar tal estádio, a fim de prolongar o período de produção de folhas. Os estudos anatômicos comprovaram presença de células da bainha ao redor dos feixes vasculares, típico de plantas C4.<br>This work had the purpose to characterize the tillering and biomass accumulation dynamic, phenology and anatomic aspects. The experiment was conducted in Passo Fundo, Rio Grande do Sul, in which six plants were harvested every 15 days, between 21/10/99 to 21/04/00, in a completely randomized design. The times were accounted using units of growing degree-days (DD), calculated as the sum of the daily mean temperatures (threshold temperature = 0&ordm;C). Transverse hand sections were used to observe the anatomic characteristics of leaf and stem. The material was stained with basic fuchsin Astra blue. It was observed a peak of 70 tillers/plant, being 60% basal; the leaf area reached 7066 cm²/plant, with 250 green leaves/plant. The height of the vegetative canopy remained with 50 cm. The flowering time was early and long pointing out to a management practice to shorten this time to maintain the plants on continual leaf production. The anatomic evaluations confirmed the presence of sheath cells (Kranz) around of the vascular bundles, as C4 plants