Watermelon seedlings: branches stout, furrowed, covered with long, dense white.
Watermelon seedlings leaves are papery, triangular-ovate, whitish-green, hispidulous on both sides, the middle lobe is longer, obovate, acute or acuminate at the tip, undulate or sparsely toothed on the margins, obtuse-rounded at the apex, and the blades curved and emarginate. Watermelon seedlings stem length 5-10 cm or so, covered with white or light yellowish brown long fleshy hairs, with 3-5 leaves, leaf blade is green or slightly white, triangular-ovate, with 3 deep clefts, the middle lobe is longer, apical acute, the edge of the undulate or sparsely toothed, both surfaces with short hard hairs.
WatermelonSeedlingThe growth characteristics of the vining period
Watermelon plants since the seedling "regimentation", the main vines from the growth of the upright to prostrate ground growth to The male flowers and the female flowers in the fruiting part of the flowering for the extension of the bud period. The underground root system still continues to grow and expand vigorously in the pre-expansion period, the above-ground growth of stems and leaves is relatively slow, and the lateral branches and floral differentiation is vigorous, with flowers blooming one after another from the base of the main vine.
Later in the spreading period, before and after the opening of the female flowers in the fruiting part, the expansion of the root system is basically completed and the growth tends to slow down, and the growth of the stems and leaves starts to accelerate, and the assimilated products of the plant are mainly used for the main vine's own nutrient growth, and the growth center of the plant is still in the growth point of the main vine. But between the main vine, side vine has not yet appeared to assimilate the product of transport transfer. When the temperature is 20 ℃ ~ 25 ℃ this period for 18 ~ 20 days.
Extension period is the main period to establish the structure of plant stem and leaf assimilation product production, and is the male and female flowers successively differentiate and form, buds, flowering period, this period of vegetative reproduction is mainly for the subsequent fruit growth and yield formation to establish the material basis.
The functional leaf area formed during the extension period accounts for more than 57% of the total leaf area of the whole life span of the plant, and the elongation of the main and lateral vines accounts for 69% and 63% of their final total length. The dry matter weight of the above ground part also increases with the rapid growth of the stem and leaves, and it has reached 18% of the total dry matter weight of the plant at the flowering stage. This period of cultivation management focus is to continue to promote the expansion of root development, promote stem and leaf growth, as soon as possible to form enough functional leaf area, for the imminent start of fruit growth to get ready, while paying attention to the control to prevent the plant from growing.