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24
Jun

Selection of Variety or Genotype to control weeds

 

1. Selection of varieties with good plant type, will help in increasing biological yield and also grain yield. In rainfed upland rice areas, in addition to higher grain yield potential, selection of variety with higher weed competitive ability is important. 

 2. Research studies at CRRI, Cuttack indicated that varieties like Vandana, Anjali and Kalinga ш with weed-smothering character w

24
Jun

Inter-cropping to weed control

 

 1. Studies in India and abroad indicate that using green manure crop like Sesbania as an intercrop with wet-seeded rice can cause a reduction in weed growth. 

2. In rice + cowpea and rice + green gram inter-cropping system, weed density and dry weight of weeds was less as compared to sole rice under upland conditions. Continuous rice mono-culture leads to an increase in the weed density adapted to wet growing conditions. 

3. Breaking the wet land cycle

24
Jun

Crop Rotation to weed control

1. Carefully planned crop rotation is one of the most effective cultural techniques for controlling rice weeds and should be used whenever feasible.

2. Weeds are often associated with specific crops because of similar growth requirements or similar plant characteristics. Because weeds vary in their growth habits and life cycles, it is essential to select rotation crops, for rotation with dissimilar life cycles and cultural requirements to interrupt the dominant weed complex.

 

24
Jun

Cultural practices to weed control

 Cultural   practicesused  to weed control are

1.  Crop Rotation

2.  Inter-cropping  

3.  Selection  of  variety  or  genotype

4.  Seedbed  preparation

5.  Fertilizer  management

6.  Water  management

 

24
Jun

Control/suppression of weeds

 Different methods are used to Control/suppression of weeds . those are

1. Cultural method

2. Mechanical method

3. Chemical method

4. Biological method

 

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