Depending on the variety, rootstock, age of the tree, and growing conditions, the crown of naturally growing trees may be broom-like, pyramidal (conical), inverted-conical, spherical, or spreading to weeping
It was applied long before people learned to fertilize plants with mineral nutrients and protect them from pests and diseases. The earliest references to pruning date back to the 3rd century BCE.
UKRAINIAN STATE STANDARD SEED OF AGRICULTURAL CROPS VARIETAL AND SOWING QUALITIES Technical Specifications SEED OF AGRICULTURAL CROPS VARIETAL AND SOWING QUALITIES
