Effects of water management and organic fertilization with SRI crop practices on hybrid rice performance and rhizosphere dynamics |
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| Authors: | Xianqing Lin Defeng Zhu Xinjun Lin |
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| Institution: | (1) Key Laboratory for Rice Biology, Ministry of Agriculture, and China National Rice Research Institute, Hangzhou, China |
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| Abstract: | A field experiment was conducted to investigate the effects of intermittent versus continuous irrigation, together with different
degrees of organic fertilization, on the growth and yield of hybrid rice, looking also at the functioning of the rhizosphere
as this is a key element affecting crop performance. The crop management practices employed generally followed the recommendations
of the System of Rice Intensification (SRI). The aim of the research was to learn how water management and organic fertilization
together would affect crop outcomes. Under intermittent water application as recommended with SRI management (aerobic irrigation,
AI), grain yield increased by 10.5–11.3%, compared to standard irrigation practice (continuous flooding, CF). The factor that
contributed most to higher yield was increased number of grains per panicle. It was seen that under the range of organic fertilization
treatments evaluated, intermittent irrigation compared with CF promoted greater dry matter production and higher leaf area
index (LAI) during the main growth stages. Also, the combination of intermittent irrigation and organic material applications
significantly increased soil redox potential (Eh), compared with CF, and also the numbers of actinomycetes in the rhizosphere
soil. Actinomycetes were evaluated in this study as an indicator of aerobic soil biota. It was seen that with intermittent
irrigation, the application of organic material improved the functioning of the rhizosphere and increased yield. However,
these results based on 2 years of study reflect relatively short-term effects. The effects of longer-term water management
and soil fertilization regimes should be also examined, to know whether these effects continue and, if they do, whether they
become greater or less. |
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