(2) Vegetative growth and reproductive growth are intertwined for a long time. At the same time, roots, stems, leaves, flowers, fruits and species are at different stages of the growth process, which will inevitably affect each other.

(3) In the period when vegetative growth and reproductive growth go hand in hand, the nutrients absorbed by leaf manufacturing and root system not only flow to the top and tender part of vegetative body, but also supply to the growing reproductive body, and there is obvious competition between them for nutrients.

(4) Explain the cultivation techniques for adjusting the above three aspects.