Crop Science and Production Collection

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Browsing Crop Science and Production Collection by Subject "Biological nitrogen fixation"

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    Potential of sesbania rostrata green manure in rice production
    (Sokoine University of Agriculture, 1993) Lwekoramu, Prudence Edward
    The potential of S. rostrate as a green manure for rice production was evaluated in two pot, glasshouse experimentsat Morogoro using a sandy clay (Vertic ustifInvent) soil.split plot biomass experiment was and production conducted to study the A plant f ixation/accumulation. Nitrogen Plants were raised both under flooded/waterlogged paddy and drained conditions for 60 days with Rhizobium either the seeds, alone were studied.The effects of inoculating seeds + steins, or steins The plant1s manurial effect in terms of nitrogen release under flooded and drained soil conditions were studied in a factorial experiment. A 45-day old S.rostrata green manure (3.26% N) was incubated in soil at Q,10,20 and 30 ton/ha and the nitrogen release patterns studied for a period of 28 days.S. rostrata, generally, grew well in both soil moisture regimes. Biomass and nitrogen accumulation were in favour of drained soils up to 45 days, and, thereafterz flooded soils due to infestation by nematodes in drained soils.Inoculation increased root and/or stem nodulation,plant biomassz plants and N2 fixation compared to non-inoculated No significant differences were observed between inoculation techniques.The equivalent of up to 20 and 34 ton/ha green biomass and 97 and 200 kg N/ha were recorded in 45 and 60 days, respectively. On decompositionf no differences were observed between flooded and drained soils in terms of soil total N. Available N released was substantial but significantly more in flooded soils where NH4-N dominated than in drained soils dominated by NO3-N.Higher levels of green manure released higher amounts of N. The larger amounts of N accumulated by the plantsr and the substantial amounts of mineralized N during the green manure decomposition in the soils, qualify S. roctrata as a potential biofertilizer in rice production.