The invention relates to a method for improving the seed production yield of a
plant, particularly relates to a method for improving the seed production yield of a common head cabbage sterile line, and belongs to the technical field of
plant cultivation. According to the method, seed
sprouting and poikilothermic treatment are adopted, and the root tips of main roots are
cut off; tray-soilless
seedling is also adopted, an open rectangular container is used for cultivation and
water storage, and the
moisture of a substrate is adjusted to keep the substrate wet, so that the mode is more uniform and practical compared with water spraying, and water is not gathered on the surface of a
plant; meanwhile, by virtue of the cooperative use of a
nutrient solution, healthy growth of seedlings is promoted, and the seedlings are full and strong, so that sowed common head cabbage seedlings have short main roots and a large number of fibrous roots, have a high survival speed after being transplanted, grow well, and are high in
disease resistance and high in
stress resistance; by virtue of scientific large-field management, parent flower section regulation, parent interaction plantation and density regulation, the seed production yield of the common head cabbage sterile line can be improved by about 35 percent compared with the prior art. The method is easy to operate, short in time, high in efficiency, and more standard and more scientific in operation. Thus, the method has a popularization value in production definitely.