Indeed, only the Flying Dragon trifoliate orange ( Poncirus trifoliata var. In spite of the increasing interest, just a few commercial rootstock varieties have been classified as truly dwarfing ones. Although the HTR-208 citrandarin and the LCR × CTSW-009 citrumelimonia were as vigorous as the Santa Cruz Rangpur lime, they induced an outstanding fruit yield due to their highest tolerance to drought and, hence, can be considered for rainfed cultivation at wider tree spacing.

year −1 if tree spacing was adjusted to the smaller tree size.

Estimated productivity on the selected TSKC × TRFD rootstocks would double to an average of 40 t Other hybrids that expressively decreased tree size were mainly sensitive to drought therefore, the mean fruit yield was low, indicating the need for irrigation, albeit fruit quality was high. Three citrandarins of Sunki mandarin (TSKC) × Flying Dragon trifoliate orange (TRFD) were grouped within the most productive dwarfing rootstocks. The production efficiency and soluble solids concentration were conversely related to the canopy volume. About a third of the evaluated hybrids were classified as dwarfing and semi-dwarfing rootstocks, that is, respectively inducing a relative canopy volume of <40% and 40–60% compared with the standard rootstock, the Rangpur lime Santa Cruz selection.

In this work, the long-term performance of Valencia sweet orange grafted onto 51 hybrid citrus rootstocks was evaluated in rainfed cultivation at 6.0 m × 2.5 m tree spacing in Northern São Paulo State, Brazil. The use of dwarfing rootstocks is one of the most feasible methods for tree size control, but few commercial varieties are available to date. As in several fruit crops, citrus trees with decreased size allow for a higher planting density, which may lead to higher productivity and facilitate operations such as harvesting and spraying.

Treesize professional 6.34 key