By W. Holzner (auth.), W. Holzner, M. Numata (eds.)
Weeds are a desirable examine for experts, not just due to their financial value, but in addition considering the fact that for that reason biology needs to be mixed with background and agriculture (and its monetary aspects). hence, weed scientists could be inquisitive about natural simple learn, focusing on normal elements, or with utilized technology, i.e. having a realistic orientation. one of many goals of this e-book is to create a synthesis among those branches of research and to study the literature of either fields. The agrestals, the weeds of arable land ~ an important workforce from an financial perspective ~ was once chasen because the major subject. different weed teams may perhaps merely be pointed out in brief (e.g. grassland weeds), or superficially (e.g. aquatic weeds), or needed to be passed over thoroughly (e.g. ruderals, simply because they're so heterogeneous), to maintain this quantity to a suitable dimension and cost. however, approximately all subsections of botanical technology were treated.
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Additional resources for Biology and ecology of weeds
2. Sampling and measuring techniques for weed vegetation When we want to study a vegetation, we must distinctly isolate it as the object of study. e. to divide the universe (population in the statistical sense) of a vegetation into several homogeneous strata. Let us imagine a weed vegetation survey of orchards. We can find many orchards on undulated topography. , and second by fruit-tree conditions, such as the kind of fruit-trees, their planting density, age, etc. After such stratification, it is useful to make a list of weed species in every orchard and express it with regard to consistancy or presence.
In Table 6 (Numata 1956), the percentage of D l - 2 or R l - 3 is a kind of life-form index. The successional status and the maturity of farmland soil are well indicated by the life-form index as the percentage of Sl_b Ph, Th, and 1 as well as D I _2 and R I_3• Table 6. Types of weed communities shown by some life-form indices (Numata 1949). 7 linear relationships (Numata and Yamai 1955; Numata 1956). In the process of establishing a weed community, there is the alternation of the L or S shaped curve (two or three species-groups) and the linear relationship (unified species-group in terms of the law of geometric progression).
Numata, M. (1967). Analysis and evaluation of plant environment. Morisita, M. and T. ). Natural HistoryEcological Studies, Tokyo, pp. 163-187** Numata, M. (1969). Progressive and retrogressive grandient of grassland vegetation measured by degree of succession-Ecological judgement of grassland condition and trend, IV. Vegetatio 19: 96-127. Numata, M. (1971). Ecological evaluation of environment as a problem of ecotopology. B. ). Topology of Geosystems, pp. 31-42. Numata, M. (1979a). Structural and successional analyses of weed vegetation.