Grafting is a technique that is used to combine two plants to produce the desired rootstock, providing trees with the desired fruit characteristics. Grafted plants develop resistance to soil-borne diseases such as bacterial wilt, southern blight, fusarium wilt, root-knot nematodes, and verticillium wilt. It also enables the plants to withstand harsh climatic conditions and to overcome salinity issues. The grafted part is composed of the scion (the top of the grafted plant) and the rootstock (the bottom part). Grafting success is facilitated by the propagation environment, grafting methods and grafting seasons. Greenhouses and shade net houses are common structures in grafting nurseries.
They are categorized into two; high cost and low-cost greenhouses. The high-cost greenhouse comprises of a polythene sheet set on metallic ashes. This type is easy to build and it can withstand strong winds without getting damaged. Greenhouses offer an ideal environment for grafted plants. Temperatures inside the greenhouse are higher than in the outside environment although they can be maintained at the desired level. The humidity in the greenhouses can be raised by sprinkling water even during the cold season. Since they offer a propagated environment, the success rate of the plants is high. The investment capacity determines the type of greenhouses and shade net houses required. It is effective for both small scale and large scale graft plants’ nurseries.
Shade net houses
A systematic shade house is required for both small and large scale multiplication of graft plants. Mostly, young graft plants need a regulated environment in partial shade. Shade net houses can be easily built since only wooden poles are used to support the shade net. They allow the circulation of air and are not affected by wind. They offer a controlled environment required for the proper growth of the graft plants.
In a controlled environment, the graft plants take fewer days to sprout. These plants have a high number of leaves and grow at a faster rate. In Greenhouses and shade net houses, the grafts seem to heal quickly. The graft exposure to optimum temperature and humidity results in variations in the number of leaves of the graft plants. High humidity helps in the formation of the callus between the scion and stock and also prevents the scion from drying. Compatibility between the scion and the stock promotes cambium formation and easy union formation.