Factors influencing allelopathy

a. Plant factors

i. Plant density

• Higher the crop density the lesser will be the allelo chemicals it encounters

ii. Life cycle

• If weed emerges later there will be less problem of allelochemicals

iii. Plant age:

• The release of allelochemicals occurs only at critical stage.
• For eg. in case of Parthenium, allelopathy occurs during its rosette & flowering stage.

iv. Plant habit:

• The allelopathic interference is higher in perennial weeds.

v. Plant habitat:

• Cultivated soil has higher values of allelopathy than uncultivated soil.

b. Climatic factors: The soil & air temperature as well as soil moisture influence the allele chemicals potential

c. Soil factors: Physico-chemical and biological properties influence the presence of allelochemicals.

d. Stress factors: Abiotic and Biotic stresses may also influence the activity of allelochemcals