Incorporation of dolomite reduces iron toxicity, enhances growth and yield, and improves phosphorus and potassium nutrition in lowland rice (Oryza sativa L)

L. D B Suriyagoda, D. N. Sirisena, K. A T N Somaweera, A. Dissanayake, W. A J M De Costa, H. Lambers

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Background and Aims: Management options to reduce the negative impacts of iron (Fe2+) toxicity in lowland rice (Oryza sativa L.) are limited. Improving productivity and ensuring sustainability of such systems requires a sound ecophysiological understanding of this widespread problem. Methods: The effectiveness of dolomite [CaMg (CO3)2] application to increase the availability of soil phosphorus (P) to rice plants, and to decrease the bioavailability of Fe2+ was tested at two locations, one with and one without effects of Fe2+ toxicity. We used a Fe2+-susceptible and a Fe2+-tolerant rice variety, with and without the application of dolomite at a rate of 1 t ha−1for three consecutive seasons. In a pot experiment, we studied the shoot and root growth, and soil and plant P and Fe nutrition with the application of 0, 1 and 10 t ha−1 of dolomite in an iron-toxicity affected soil. Key Results: With the application of dolomite, both in the field and in the pot experiment, the exchangeable soil Fe2+ concentration decreased with an increase in soil pH and P availability. Plant height, shoot and root dry weight, grain yield, and P and potassium content increased, whereas the organ Fe concentration and content decreased with a greater response by the Fe2+-susceptible rice variety than by the tolerant variety, and with the greatest effect at the Fe2+-toxicity-affected site. Conclusion: Application of dolomite to lowland rice fields affected by Fe2+ toxicity can increase grain yield, while reducing the negative impacts of Fe2+ toxicity. The magnitude of these positive responses would vary depending on variety, season and soil conditions.

Original languageEnglish
Pages (from-to)299-312
Number of pages14
JournalPlant and Soil
Volume410
Issue number1-2
DOIs
Publication statusPublished - 1 Jan 2017

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