Interaction Of Soil-inorganic Nitrogen In Rice Fields Of Kilombero ...

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PDF Published: 2021-06-01 DOI: https://doi.org/10.13057/bonorowo/w110104 Keywords: Crop management, hydrology, inorganic nitrogen, Kilombero Floodplain, rice fields

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AUSTIANO BERNARD YOBELE Sokoine University of Agriculture. P.O. Box 3000, Chuo Kikuu, Morogoro, Tanzania METHOD KILASARA ♥ Sokoine University of Agriculture. P.O. Box 3000, Chuo Kikuu, Morogoro, Tanzania

Abstract

Abstract. Yobele AB, Kilasara M. 2021. Interaction of soil-inorganic nitrogen in rice fields of Kilombero Floodplain, Tanzania. Intl J Bonorowo Wetlands 11: 32-47. At Ifakara Morogoro Region, a study was done to determine the effect of selected crop management interventions and hydrological conditions on soil NH4+ and NO3- concentration. The study chose Valley Middle and Fringe locations as distinct hydrological zones. Three repetitions of an experiment with six treatments were laid down: semi-natural vegetation (TR1), farmers practice (TR2), bunding alone (TR3), bunding + 60 kgN/ha (TR4), bunding + 120 kgN/ha (TR5), and bunding+Lablab green manure (TR6). As a test crop, the SARO 5 rice variety was employed. The trials took place during the pre-season of 2014/15 and the regular 2015/16. Data were gathered from a depth of 0-10 cm in the soil. Using the GenStat Program, two-way ANOVA and post hoc-Tukey HD test statistical analyses were done. Pre-season NH4+ concentrations followed three distinct patterns: an initial increase to peak levels within 3 and 6 weeks for the Fringe and Middle sites, a fall (7th to 9th week for the Middle, and 4th to 6th week for the Fringe), and an increase (from 7th, Fringe and 10th week, Middle). The Middle site had the highest peak NH4+ levels (TR6-0.007401, TR5-0.004776, and TR4-0.04525, g/kg soil, and TR4-0.004524, TR5-0.004595, g/kg soil, respectively). At the Middle and Fringe locations, peak NH4+ values varied considerably between treatments, following the trend TR6>TR5>TR3>TR4>TR1>TR2 and TR4>R6=TR5=TR3+TR2>TR1. Nitrate levels declined within 1-2 weeks at both sites, reaching their lowest levels between 4 and 7 weeks, and then gradually increased to 10. Rice cropping season NH4+ and NO3- variation followed a similar pattern for both locations, except a sharp increase in treatments with N input during weeks 8 and 10. Hydrological conditions had no significant effect on the NH4+ and NO3- levels (P = 0.05). The study advises that the experiment be repeated under controlled conditions.

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