Pioneer plants are with high adaptability, so they can grow in disturbed environments, such as ex-limestone mining areas. This adaptability is supported by the ability of these to associate soil bacteria their rhizosphere area. The presence support growth pioneer on land. purpose this study was characterize around former limestone Soil samples area 5 from ex-mining lime were then isolated using...

Neem (Azadirachta indica) has been widely used as a traditional medicine and several bioactive compounds have been isolated from this species, but to date no potent allelopathic active substance has been reported. Therefore, we investigated possible allelopathic property and phytotoxic substances with allelopathic activity in neem. An aqueous methanol extract of neem leaves inhibited the growth...

This paper is based on a talk given at the Annual Meeting of the American Mathematical Society in San Antonio, Texas, January 21-24, 1978. The subject is interacting particle systems and the aim of the paper, like that of the talk, is to explain some of the results in this area to someone with no knowledge of probability theory except for an understanding of what it means to flip a coin with pr...

Epidermal conductance (gmin) is water lost through the cuticle and stomata of plants when stomatal conductance is minimal. Low gmin may affect survival of perennial grasses by maintaining tissue hydration during drought. If true, populations from environments where drought is severe may exhibit reduced gmin compared to those from less arid environments. Success of invasive grasses may also be a...

Weed resistance to herbicides is a natural phenomenon that exerts selection on individuals in a population. In Brazil, glyphosate resistance was recently detected in Digitaria insularis. The objective of this study was to elucidate mechanisms of weed resistance in this plant, including genetic variability, allelism, amino acid substitutions, gene expression, and enzymatic activity levels. Most ...

For optimum postemergence crabgrass (Digitaria spp.) control, a single quinclorac herbicide application could be properly timed and delivered with spray nozzles that produce droplets ranging from very coarse (401-500 μm) to medium (226-325 in size maximize target coverage minimize the potential for drift. Crabgrass is an invasive annual grass weed of cool-season turfgrass maintain as lawns, gol...