KALRO Bean Varieties
Beans technologies developed for the various agricultural ecosystems
Rice Plantations
With improved varieties at the Kisumu Kibos irrigation scheme
Director Food Crops
During a Rice Farmer Field day at the KALRO Kibos Centre
KALRO Cereals
Improved varieties of cereals at the markatplace in Nairobi

Weed Management

Weeds compete directly with the rice plants and reduce rice yield. Each 1 kg dry matter of weeds is equivalent to 1kg grain loss. Weeds cause most yield loss within the first 20- 50 days after crop establishment. Weeding after panicle initiation may also be important to prevent weeds shedding seeds in future crops.

Effective weed management
•    Plowing and harrowing in fallow should be undertaken at least 10-14 days apart or after rain.
•    Good land leveling reduces weed growth because most weeds have trouble germinating under water
•    Select  varieties which have early vigor
•    Use clean rice seed which is free of weed seeds.
•    Apply permanent water early - weeds cannot germinate under water.
•    First weeding begun within 2-3 weeks after establishment and the second in another 2-3 weeks.  Weed before fertilizer application.
•    Using herbicides. Identify the weed correctly and use the appropriate herbicide as recommended on the label.
•    Spray when the weeds are small
•    Pre-emergent herbicides apply after planting prior to establishment
•    Post emergent  herbicides apply after emergence being careful of crop damage
•    Herbicides are poisonous; if they are not used properly they can cause health and environment problems. Label them clearly and keep them out of children’s reach.
•    Always use protective clothing when spraying.
•    Do not wear raincoats as this increases sweating.


 For more information

KnowledgeBank Crops

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KALRO Value Chain

Guava variety KALRO B8
Maize KALRO Mtwapa



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P.O. Box 57811-00200, Nairobi
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Rice blast disease

Favorable conditions for disease development:

  • Node blast: Black-brown lesions on the node.  
  • Neck blast: Black or brown rot on the neck of the panicle.