TY  - BOOK
AU  - Navaz M 
AU  - Sansamma George( Guide)
TI  - Investigations on the allelopathic influence of eupatorium(chromolaena odorata(L.) king and robinson) and utilization as organic manure
U1  - 630 
PY  - 2002///
CY  - Vellayani
PB  - Department of Agronomy, College of Agriculture 
N2  - Lab and field experiments were conducted at the Instructional 
Farm, College of Agriculture, Vellayani during June 2001 to February 
2002 to study the allelopathic influence of eupatorium (Chromolaena 
odorata (L.) King and Robinson) on important field crops and weed 
species and to investigate the potential of the weed biomass as organic 
manure. 
In Experiment I, allelopathic influence of eupatorium on three 
important field crops ie., rice (Oryza sativa L.), cowpea (Vigna 
unguiculata (L.) Walp.) and Bittergourd (Momordica charantia L.) and 
two weed species. ie ., Thatch grass (lmperata cylindrica (L.) Beauv.) 
and eupatorium (Chromofaena odorata (L.) King and Robinson) was 
studied. The treatments comprised of aqueous plant part leachates of 
fresh and decayed eupatorium at five and ten per cent co ncentr at io n. 
The results revealed that aqueous fresh plant part leachates inhibited 
germination and early seedling growth of rice, cowpea and bittergourd 
severely. Germination of thatch grass and eupatorium were also 
suppressed by the treatments. In general, the aqueous fresh plant part 
leachates showed greater effect than the decayed plant part leachates, 
and the effect was more -with leaf leachate. The inhibitory effect was 
more with the higher concentration of the leachate. 
Under Experiment II, field observations were made to study the 
biology of eupatorium under Kerala conditions. Composting of mature 
eupatorium was tried and the response of bhindi to eupatorium as 
compost and green leaf manure was observed in comparison with poultry 
manure, vermicompost, coirpith compost and farmyard manure. 
The results revealed that eupatorium took about 293 days from 
germination to seed maturity under Kerala conditions. The plant 
flowering was during December - January and seeds dispersed in the 
 
months of February - March. Each plant produced about 25,000 seeds 
on an average and had a germination percentage of about 30 per cent. 
When the mature and dried eupatorium weed biomass was 
composted, the C : N ratio came down from 62.72 to 18.88 in four 
months and was ready for use as organic manure. The NPK content of 
the composted material was 0.76, 0.58 and 0.81 per cent respectively. 
The yield response of bhindi to eupatorium as organic manure 
revealed that eupatorium compost was on par with poultry manure and 
farmyard manure treatments. However when the fresh weed biomass 
was used as green leaf manure, the yield was considerably lower. The 
results indicated the need and usefulness of composting the weed 
biomass before using it as sole source of organic manure in bhindi. 


UR  - http://krishikosh.egranth.ac.in/handle/1/5810105717
ER  -