PERCENTAGE FREQUENCY AND QUADRAT SIZE IN ANALYTICAL STUDIES OF WEED FLORA.

The article reports on a study on the percentage frequency and quadrat size in analytical studies of weed flora. This study was conducted while investigating the distribution of the individuals of the weed species in small plots of cultivable land which were left undeveloped for a short duration. Densities are compared by their standard errors when calculated and observed. A disagreement between the field and calculated data is revealed which however improves when the less common species are excluded and the relationship between the quadrat size and the average number of species found within the quadrat size is studied.