Download Allelopathy by Elroy L. Rice (Auth.) PDF

By Elroy L. Rice (Auth.)

An intensive revision and replace of the 1st variation, this moment variation is designed to create an knowledge of the speedily constructing box of allelopathy. the writer appraises latest wisdom in definite severe parts, similar to roles of allelopathy within the prevention of seed decay and within the nitrogen cycle, the chemical nature of allelopathic compounds, components affecting concentrations of allelochemics in crops, stream of allelochemics from vegetation and absorption and translocation by way of different crops, mechanisms of motion of allelopathic brokers, and elements deciding upon effectiveness of allelopathic compounds after egression from generating organisms. parts during which extra easy and utilized study is required are emphasised. A dialogue of terminology and early background of allelopathy is through a dialogue of the real roles of allelopathy in forestry, agriculture, plant pathology, and typical ecosystems. A separate directory of the phyla of crops confirmed to have allelopathic species can also be included.
Allelopathy, moment Edition, is a complete evaluate of the literature on allelopathy, integrating info on allelopathy with very important info on ecological and agronomic difficulties, bringing up greater than one thousand references. between those that will locate this to be a important resource of data are ecologists, horticulturists, botanists, plant pathologists, phytochemists, agricultural scientists, and plant breeders

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II. ALLELOPATHIC EFFECTS OF CROP PLANTS O N OTHER CROP PLANTS Theophrastus observed and described inhibitory effects of crop plants on other crop plants over 2000 years ago (see Chapter 1). In spite of this, no scientific research was done to verify such observations until early in the twentieth century. Schreiner and his associates published a series of papers starting in 1907 in which they presented evidence that exhaustion of soil by single-cropping is due to addition of growth inhibitors to the soil by certain crop plants (Schreiner and 42 2 .

The extracts were tested against seed gemination and seedling growth of bajra over a 48-hr period. Extracts of C. colocythis delayed seed germination of bajra but had little effect on final germination. Root and shoot growth were inhibited and root hair formation was suppressed. Citrullus lanatus was later demonstrated to also have allelopathic potential (Bhandari, and Sen, 1972). Horowitz and Friedman (1971) incubated dried subterranean organs of bermudagrass (Cynodon dactylon) in light and heavy soil for 1, 2, or 3 months.

Hysterophorus consisted of clusters of Par­ thenium pollen. Pollen grains deposited in large numbers on leaves reduced the chlorophyll content of the leaves of certain test species. Prostrate knotweed (Polygonum aviculare), a bad weed in crops in many parts of the world, is also a pernicious weed in lawns in many countries, including the United States. It rapidly encroaches into bermudagrass lawns, and the ber­ mudagrass dies in patches of prostrate knotweed, whereas bermudagrass at the edges of the knotweed patches turns yellow.

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