Abstract: A preparation method of a carbon-based selenium-enriched fertilizer for rice is disclosed. The preparation method of the carbon-based selenium-enriched fertilizer for rice includes planting a selenium-enriched plant material; collecting and concentrating a selenium-enriched extracting solution; preparing modified selenium-enriched biomass charcoal from the tertiary residues; and preparing the carbon-based selenium-enriched fertilizer. In the present disclosure, active organic selenium enriched and generated by plant is compounded with the biomass charcoal, so that the fixation and loss of the active selenium in soil are reduced, and the utilization efficiency of the selenium fertilizer is improved.

Abstract: The present disclosure relates to a method for avoiding high temperature and maintaining yield of rice. The method prevents high temperature and builds a comprehensive disaster prevention and mitigation system by screening high-temperature resistant varieties, sowing at suitable time, cultivating strong seedlings, irrigating, applying silicon fertilizer and adjusting density, and chemically regulating; the method can avoid or attenuate heat injury, and be conducive to maintaining yield in disasters. The present disclosure is appropriate for areas prone to high temperature in China, especially for rice regions in the middle and lower reaches of the Yangtze River and Southwest China, for example, Fuyang, Zhejiang Province, Lujiang, Anhui Province, Jingzhou, Hubei Province, and Luzhou, Sichuan Province.

Abstract: A preparation method of a carbon-based selenium-enriched fertilizer for rice is disclosed. The preparation method of the carbon-based selenium-enriched fertilizer for rice includes planting a selenium-enriched plant material; collecting and concentrating a selenium-enriched extracting solution; preparing modified selenium-enriched biomass charcoal from the tertiary residues; and preparing the carbon-based selenium-enriched fertilizer. In the present disclosure, active organic selenium enriched and generated by plant is compounded with the biomass charcoal, so that the fixation and loss of the active selenium in soil are reduced, and the utilization efficiency of the selenium fertilizer is improved.