Classification of weeds - 3,4,5 and 6

 3. Based on soil type -

a) Weeds of black cotton soil : 

These are often closely allied to those grow in dry condition.

Ex. Aristolochia bractea

b) Weeds of red soil :

They are like the weeds of garden land consisting of various classes of plants.

Ex. Commelina benghalensis

c) Weeds of sandy soil :

Weeds that occur in soil having good drainage.

Ex. Leucas sapera

d) Weeds of laterite soil :

Ex. Lantana camera

4. Based on origin -

a) Indigenous weeds :

All the native weeds of the contry are coming under this group and most of the weeds are indigenous.

Ex. Acalypha indica, Abutilon indicum

b) Exotic weeds :

These are weeds introduced from other countries. These weeds are normally troublesome and control becomes difficult.

Ex. Partherium hysterophorus, Acanthospermum

5. Based on cotyledon -

These are classified in to two type-

a) Monocots  : 

Ex. Crotalaria verucosa

b) Dicots : 

Ex. Paricum flavidum, Echinochlora colona

6 . Based on soil -

These are classified as follows-

a) Acidophile :

Weeds which are grown in acidic soil.

Ex. Rumex acetosella

b) Basophile :

Weeds which are grown in saline and alkaline soil.

Ex. Taraxacum species

c) Neutrophile : 

Weeds of neutral soil are called Neutrophile Weeds.

Ex. Acaypha indica