There was few research on the utilization and development of weedy rice. Some weedy rice has remarkable good characteristics as forage in some soil which is difficult to plant crops and pastures. In this study, two weedy rice lines of japonica and indica subspecies with high ratooning ability (Xijing, japonica; Gaoxian, indica) were used to study the possibility of their forage utilization and related suitable cultivation methods. Three different stubble heights of first season were set in 2018 and 2019, and three cutting times of first season (heading stage, milk stage, and waxy ripening stage) were set in 2019. The ratoon grass was harvested 40 days after the first season harvest. For japonica weedy rice line Xijing, its grass yield was significantly lower than that of indica weedy rice line Gaoxian. The dry matter yield of first season grass plus ratoon grass of Gaoxian with the first season harvested at milk stage was the highest of all. The total digestible dry matter yield (first season grass plus ratoon grass) of Gaoxian with 15 cm cutting stubble of first season was higher than those of stubble 30 and 45 cm treatments (p < .05). In conclusions, indica weedy rice line Gaoxian, with high biomass of first season and good ratooning ability, had the good potential for forage development by harvesting first season at milk stage with 15 cm stubble height.

中文翻译：

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强再生力籼粳杂草稻饲草利用研究

对于杂草稻的利用和开发研究还很少。有些杂草稻在一些难以种植农作物和牧草的土壤中作为饲草具有显着的优良特性。本研究以两个高再生能力的粳稻和籼稻亚种（西粳、高县、籼稻）为材料，研究其饲料利用的可能性及相关栽培方法。2018年和2019年设置了三个不同的第一季留茬高度，2019年设置了三个第一季刈割时间（抽穗期、乳熟期、糯熟期）。再生草在第一季收获后40天收获。 。粳稻系西粳产草量显着低于籼稻系高县。其中以乳期收获的高县第一季草和再生草干物质产量最高。高县第一季留茬15 cm处理的可消化干物质总产量（第一季草+再生草）高于留茬30和45 cm处理（p  < .05）。综上所述，籼杂草稻高县品种首季生物量高，再生能力强，在乳熟期收获首季茬高15 cm，具有良好的牧草开发潜力。