Weeds and their Control
|Common weeds in rice fields||
Broad leaved weeds:
A. Dry seeded rice [upland and lowland (semi-dry) rice]
Spray any of the following pre-emergent herbicides: Butachlor @ 1.25 kg ai/ha, oxyfluorfen @ 0.15 kg ai/ha, pendimethalin @ 1.50 kg ai/ha, pretilachlor @ 0.75 kg ai/ha on the same day of seeding or within six days of seeding.
B. Wet seeded rice (direct seeding with sprouted seeds under peddled conditions)
Spray any of the following herbicides:
(a) Butachlor @ 1.25 kg ai/ha 6-9 days after sowing;
(b) Pretilachlor + safener (sofit) @ 0.45 kg ai/ha 3-5 days after sowing.. Give a follow up application of 2,4-D @ 0.8 kg ai/ha at 20 days after sowing.
To control Echinochloa sp. spray cyhalofop butyl @ 0.08 kg ai/ha at 15-18 days after sowing.
In areas where wild rice has become a menace, the following agronomic practices can be followed.
a. Coat dry seeds with 20% calcium peroxide using 4% PVA solution as an adhesive and then broadcast in the field with 10-15 cm column of standing water.
b. Maintain the water level for 10-12 days to prevent germination of wild rice.
c. Drain the field and apply N and K fertilizer as per recommendation for rapid growth of the rice seedlings.
d. Where yeranda
(common teal) is a problem, bird scaring should be arranged till the water
Precaution while using herbicides
Keep the rice fields free from weeds up to 45
days either by hand weeding or by use of herbicides. In using herbicide
follow the guidelines.
|References||Kerala Agricultural University. 2011. Package of Practices Recommendations: Crops.14th edition. Kerala Agricultural University, Thrissur- 360 p.|