Provided in the present invention is a rapid growth and early fruiting method for cocktail grapefruit. The method comprises: selecting
a site and building a
greenhouse, i.e., selecting a planting area, and building a rain shelter
greenhouse; determining planting points, i.e., on the basis of the
plant row spacing requirement of 3 m×2.7 m, determining the planting points in the
greenhouse, and setting 78 planting points per Chinese acre; performing root-limiting cultivation, i.e., providing a composite root
limiter at each planting point, and filling each composite root
limiter with formulated substrate soil so as to cultivate cocktail grapefruit seedlings; cultivating a near-
trunk fruiting tree form, i.e., during the
transplanting of each cocktail grapefruit
seedling,
pruning the
trunk of the cocktail grapefruit
seedling 30-40 cm above a graft union, and selecting and retaining robust branches year after year so as to form a multi-layer
trunk structure; and performing precise fertilization, i.e., using annular drip-
irrigation pipes of the composite root limiters to replenish water and apply a formulated
fertilizer. By means of using a
composite structure where the composite root
limiter is combined with an annular drip-
irrigation device, the present invention solves problems in the prior art, such as the low
utilization rate of a
fertilizer caused by conventional
fertilizer application during the planting process of cocktail grapefruit seedlings, and the
poor quality of cocktail grapefruits produced by initial-fruited trees.