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ALEELOPATHY OF CROPS WHO HAS THE ALLELOPATHIC EFFECT ON OTHER CROPS




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    Wheat

    The decomposing wheat residues contain primary organic acids such as phenolic acid. Wheat residues added 1.5 tonnes phenolic acid per acre under no tillage condition.

    Wheat straw inhibited seed germination, decreased root and shoot growth, shortened internodes and reduced the grain yield of wheat.

    Decomposing of wheat straw may inhibit the root growth of barley.

    The residues of the wheat contains acetic acid, butyric acid and iso butyric also have the number of phenolic acids.

    Decomposition of the wheat residues in the aerobic condition stimulate the root growth of barley seedling but in the anaerobic condition inhibit the growth of roots due to the higher conc. of the acetic acid.

     

    Corn

    Decomposing of corn residues decreased the respiration of tobacco seedlings and causes chlorsis and stunted growth of maize and inhibited the nitrification process in the soils.

    Butyric acid, vanillic acid and salicylic acids are present in the corn residues

    Rice

    The allelochemicals released by the decomposition of the rice residues cause the effect on the growth of rice seedling and decreased the yield of rice. Nodulation process, biological nitrogen fixation and grain yield also reduced in soybean by rice stubbles.

    Residues of the rice have vanillic and butyric acids

    Rye

    Decomposition of rye residues inhibits seed germination, seedling emergence and radical elongation of the rye seedling.

    Butyric and benzoic acids are present in the rye residues

    Oat

    Oat straw was more toxic at the maturity and its toxicity remains up to 8 weeks after decomposition.

    Aqueous extract of decomposing oat residues were inhibitorier to seedling growth of the test species.

    Sorghum

    It proves harmful for the maize, oat and wheat growth. It proved inhibitorier to small seeded, broad leaf species. The aqueous extract of sorghum stubble inhibited the seed germination and root growth.

    Barley

    Decomposing barely residues became phytotoxic 7-10 days after incorporating in the soils toxicity reached peak at 20 days and declined after 45 days.

    Benzoic acid present in the residues of the barley

    Clover

    Aqueous extract of clovers caused poor and abnormal seed germination and depressed seedling growth.

    Soybean

    Soil microorganisms form the inhibitory substances from the decomposing of the soybean residues.  An aqueous extract inhibit the seed germination soybean, alfalfa and many other.

    Leucine and valine acids found in the soybean

    Sunflower

    Reduced the growth of sorghum seedling

    Inhibit the seed germination

    Brassica oilseed crop

    Stunted the plant and reduced the dry weight

    Inhibition of germination

    Sugarcane

    Inhibit the growth of young sugarcane plant

    Decrease the stem and leaf growth

    Acetic, vanillic and oxalic acids are present in the sugarcane residues

     

    Tobacco

    Effect on germination, root and shoot length and seedling vigor of rice

    Increased the height, specific leaf weight and chlorophyll content in maize

    By.

    Israr Masood* and Imran Ramzan1

    *Author Department of Soil and Environmental Sciences, 1 Co-author Department of Agronomy, University of Agriculture Faisalabad, Pakistan

    israrmasood53@yahoo.com

     

    About Muhammad Ramzan Rafique

    I am from a small town Chichawatni, Sahiwal, Punjab , Pakistan, studied from University of Agriculture Faisalabad, on my mission to explore world I am in Denmark these days..

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