Summary
Through Mo fertilization and N or P or NP enrichment, cultures of inoculant algaT. tenuis were prepared in situ in a rice-growing clay loam. The pattern of distribution of total, organic and mineral N was studied during the physiological stages of tillering, inflorescence and harvest stages of rice with particular reference to Mo-fertilized soils. Mineralisation sequence was studied in the postharvest stage also upto 250 days including the life span of the rice plant.
Though effect of fertilizer was generally more prominent than that of algalization, the latter in Mo-fertilized soils, could signify substantially higher mineral N, and also the low mineralisable index of N, a phenomenon very much desirable for slow release of soil reserve. A typical curve of soil N pattern possesses maximal level at tillering with levelling off at the harvest stage, but the curve of soil N pattern under algalization in Mo-fertilized soils was a hyperbolic one, having a maximal value at tillering.
There was no substantial N addition in control soils with or without alga. Algalization became effective only in Mo-fertilized soils upto 24–29% at tillering and 40% at blooming. Algalization with P or NP application in Mo-fertilized soils caused a 50% rise in the organic N. Sustenance of levels of both total and organic N beyond the tillering stage was a characteristic feature of algal inoculation.
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Chopra, T.S., Dube, J.N. Changes of N content of a rice soil inoculated withTolypothrix tenuis . Plant Soil 35, 453–462 (1971). https://doi.org/10.1007/BF01372678
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DOI: https://doi.org/10.1007/BF01372678