Top grafting crown changing method for big American hickory tree by adopting square bud grafting

Abstract

The invention discloses a top grafting crown changing method for a big American hickory tree by adopting square bud grafting. The method comprises the following steps: S1, selecting a high-branch treewith the diameter greater than 2 cm at the height of 1.3 m of a trunk, determining a stubble height of the selected sapling according to a cultivation purpose, and cutting the trunk in the period from Frost Descent to Winter Solstice of the first year, wherein the trunk is cut in sunny weather and no rainy weather is continued subsequently; and smearing a disinfectant at a cut-off portion, and then smearing a protective agent. The method has the effects that the sapling can grow in the circumferential direction after crown changing, and one to two years later, robust and uniformly distributedlateral branches are rotated for square grafting, so that the following three effects can be achieved: firstly, the survival rate can be obviously improved, and the grafting survival rate can reach 95% or above; secondly, the growth direction of the crown after successful grafting can be controlled, and branch shaping and lighting are facilitated; and thirdly, the growth height of the sapling canbe controlled, and later management is facilitated.

Description

technical field [0001] The invention relates to the technical field of pecan crown replacement, in particular to a method for high grafting and crown replacement of large American hickory trees by adopting block bud grafting. Background technique [0002] American hickory, also known as "thin-shell hickory, pecan", is a plant of Juglandaceae, the plant can reach 50 meters; the buds are yellowish-brown; the branchlets are pilose; odd-numbered pinnate compound leaves, petioles and leaf rachis Plumber; leaflets with very short petiole, apex acuminate, margin with single or double serrations, first covered with glands and pilose, later hairs shed and often have sparse hairs on veins; male catkins 3 1 bundle, almost without peduncle, anthers hairy; female spikes erect, rachis of inflorescence densely pilose, lobes of involucre hairy; fruit oblong or oblong, leathery, endocarp smooth, taupe , with dark brown spots and black stripes at the top; the base is incomplete with 2 rooms;...

AI Technical Summary

Problems solved by technology

Most of the naturally growing sapling branches grow vertically and cannot fully receive sunlight, which affects the results and requires manual intervention

[0003] The existing ordinary manual intervention grafting method has a low survival rate and poor branch extension effect, which affects the subsequent fruit setting, low fruit setting rate, and is not conducive to plastic surgery