Sesbania co culture with irrigated rice system has been proven as a potential weed management option which supplies nutrition as well.
If you are considering irrigated rice then sesbania is best option
Field Peas is other option beside sesbania as potential brown manuring crop.
Brown manuring is simply a ‘no-till’ version of green manuring, using an herbicide to desiccate the crop before flowering instead of using cultivation. According to this technique, Sesbania or other green manure crops are grown in standing cereal crops and killing them with the help of herbicide for manuring where the plant residues are left standing in the field along with main crop without incorporation/in-situ ploughing until its residue decomposes itself in the soil aiming to add organic manure beside weed suppression by its shade effect.. The post-emergence herbicide spray on green manure leaves resulting in loss of chlorophyll in leaves showing brown in colour is referred to as brown manuring . This may also be a preferred option due to lighter soils prone to erosion and reduce weeds. Brown manuring not only adds organic matter content but also improves the physico-chemical and biological properties of the soil
Sunhemp (Crotolaria juncea) is an other poential green manure crop during kharif season
Any pulse crop may be grown for brown manuring. Kharif pulses which have good foliage and rapid growth are more suitable for this purpose.
Any pulse crop may be grown for brown manuring. Kharif pulses which have good foliage and rapid growth are more suitable for this purpose.
You can use Alfalfa and Desmodium grass also - which are a green manure legumes can play a major role in conservation agriculture and improve farm productivity.
They are fast growing, hence accumulates high biomass within a short period f time. They can increase plant nutrient supply in the soil especially nitrogen....
Brown manuring as mentioned by the previous researchers, is application of a herbicide (post emergence). The herbicide dessicates the green biomass and is left as a brown crop residue.
It can also include the cereals as well. Preference is given to the legumes for its N contribution. But a cereal could effectively smother the weeds by the large quantity of biomass produced in a short span of time. This can be terminated and a subsequent crop taken up.
We need planters to do the job (seeding in a heavy mulch). The mulch could obstruct the seeding operation and also the emergence in case the green manure crop is broadcast sown. The problem can be overcome with line seeding.
Brown manuring adds organic matter content and improves the physico-chemical and biological properties of the soil
Brown manuring is simply growing any of the green manuring crop alone in the field or in co- culture with the crop (may be rice preferably) followed by killing after attaining definite height (usually 1 month old) by using any of the selective herbicide (like 2,4-D)...After sometimes, green manuring crop will be deteriorated and buried in the soil or incorporated or mixed with the soil...This will add organic matter in the soil while improving soil physical, chemical and biological properties to some extent and ensure favorable edaphic environment needed for growth and development...Upto one month, green manuring crops will get profusely vigorous growth, providing lesser Oppurtunities for weed emergence hence it act as smoother crop...crops like dhaincha, clover etc are good option to be applied as brown manures...
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