Not sure but Crotalaria juncea produce good quantity of biomass (35-40 t/ha).
Dhaincha (Sesbania aculeata) is the best green manure crop because it contains 3.50% N, which is higher than any other green manure crop. Dhaincha can yield up to 25-30 t green biomass/ha. Whereas, Sunnhemp (Crotolaria juncea) contains 2.30% N and can yield up to 15-20 t green biomass/ha.
@Rajiv Dhaincha (Sesbania aculeata) can add up to 15 t fresh biomass/ha (around 4 t dry biomass/ha) and 250-360 kg N/ha to the soil. Sunn hemp (Crotolaria juncea) may add up to 19-20 t fresh biomass (around 6 t dry biomass) and around 110 kg N on per ha basis. For details, you may go through Hindi periodical "Krishi Manjusha", and article by Pratibha Kumari et al. 2018. Krshi Manjusha, 1: 41-43.
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Sesbania rostrata is a good crop as it has both stem and root nodules. The Rhizobium species fixes high amount of nitrogen
There are. many crops that can be used for green manure. We evaluated very extensively Dhaincha (Sesbania aculeata) and Sunnhemp (Crotalaria juncea) at PAU, Ludhiana and found that Sunnhemp produces more biomass and add more nitrogen than Dhaincha.Water requirement of Sunnhemp is also less than Dhaincha. Sunnhemp also reduces incidence of soil nematodes.
Crotolaria juncea (Sunnhemp) and Sesbania aculeata (Dhaincha) produce biomass equivalent to 30.6 and 23.2 t/ha and contain 2.3 % and 3.5 % N respectively. It is followed by Pillipesara and cow pea that produce biomass equivalent to 25 and 23.2 t/ha respectively. Sesbania rostrata has the highest atm nitrogen fixing potential and can completely substitute urea-N in rice. Green manuring legumes improve nitrogen by BNF.
Cow pea, Alfa alfa, Clover, Dhaincha (Sesbania aculeata) and Sunnhemp (Crotalaria juncea) etc. are the best green manure crops as well as they fixes nitrogen and have good biomass and can be used in organic farming.
Green manuring is an important practice for sustainable agriculture. Green manures are made by incorporating plant materials (either freshly cut weeds or rotation crop debris) into soils while still green. Upon decay, green manures enrich the soil with organic matter, and to a lesser extent with nutrients such as N and P. Ample time for the green manure to decompose should be allowed between the incorporation of weed/crop debris in the soil and the planting of the new crop.
Dhaincha (Sesbania aculeata) and Sunnhemp (Crotalaria juncea) Cow pea and many leguminous plants.
In general, legumes (Fabaceae plant family) are the pioneers in increasing biomass and nitrogen in the soil. these are usually the bacteria which is situated in the roots of these plants and the its most important duty is stabilized atmospheric nitrogen and increasing the soil productivity, subsequently. Some of the most important ones are: Azotobacter, Rhizobium and Azoospirillium.
Stylosanthes seabrana is also very good tropical perennial forage legume, it is also used as a green manure for soil health and fertility build up.
Dhaincha (Sesbania aculeata) is the best green manure crop because it contains 3.50% N, which is higher than any other green manure crop.
While legumes are good option as green manure crops this depends adaptation and the conditions to the types of soil nitrogen and carbon increases which are possible.
Under temperate agriculture field crop, hairy vetch can provide substantial biomass and increases in both nitrogen and carbon. This amount of Nitrogen provides over 150 kg N per ha which is more than sufficient for an optimized maize crop a heavy feeder and contributes 500 to 1,000 kg/ha of soil Carbon.
The use of the legume greatly reduces the carbon footprint of cereal production by the ability to substitute for highly energy-intensive Bosch Haber ammonia production.
In addition, ammoniated fertilizer can contribute to liming requirements.
Nonlegumes can also be very effective in contributed ing limiting conditions in the soil. They can provide N C and also have other mechanisms contributing to soil productivity.
When daikon oilseed radish is used it can biologically fumigate the soil allowing the management of nematodes root pathogens and even weeds.
Another very compelling situation is the use of Mexican Sunflower which has substantial to provide huge amounts of both carbon-nitrogen and potassium which is critical.
Check my mini-review on the use of Mexican Sunflower for more information under my profile.
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