The effects of plant growth regulator on plants have high pertinence and flexibility. Watermelon plants have adequate nutrition is its foundation of increasing production, improving quality. Plant growth and development in addition to requires a lot of nutrients, such as water, inorganic salts, organic compounds, but also requires a class of active substance which has special regulation function on its growth and development, but the volume is very little, called growth regulators. Now described the application techniques of plant growth regulators on watermelon as below:
Watermelon fruit undesirable phenomenon is more common in production, causing watermelon hard to bear fruits have many reasons, in plants cultivated, fruit drop is the most common and hard to deal with, it is caused by plant body balance is broken, use plant growth regulators can effectively deal with this balance, improve fruit setting rate, guaranteed watermelon yield. Forchlorfenuron is a kind of cytokine, can promote young fruit cell rapid divide and enlargement, thus improving fruit set or increase fruit. In the morning from 7 to 10 pm when watermelon female flowers open, with a brush dipped in a little Forchlorfenuron solution, evenly spread on female ovary and pedicel surface, can effectively improve fruit setting rate. While used, with water diluted 100 times is better.
Gibberellin is a plant hormone, its use allows the plant rapidly expand nutrient area, enhance the synthesis and utilization of carbohydrates, lay the foundation for increasing production. In the early planting of watermelon, due to the changing temperature environment and transplanting root damage and other adverse factors, it is likely to cause watermelon have stiff seedlings, thin plant body, slow growth and so on. In this case, with 50 ~ 100PPm gibberellin solution spraying on the watermelon seedlings, 3 to 5 days can significantly contribute to the growth of melon roots and stems, show up internode elongation, leaf increases, per unit leaf area chlorophyll content decreased, leaf shallow and other phenomenon.
Paclobutrazol is a growth retardants, its use can inhibit plant petiole elongating and leaf expanding, controlling unnecessary leggy plants, so as to achieve the purpose of nurturing seedlings. Transplanting is a common method of watermelon production, nurturing seedlings is the key of seeding work. However, during the seedling emergency to the first true leaves appear, the next ovule easily stretch, seedbed management with a little inattention, such as the high temperature and humidity is too large will make the seedlings elongating, forming thin and tall seedlings, this seedlings not only easy to catch an illness, and transplant survival is poor, is extremely unfavorable to watermelon production. Tests show that use paclobutrazol can effectively inhibit the elongation of embryos under melon plants, plant type is dwarf and compact, cotyledons is thick, small and dark green. Even under high temperature conditions will not spindling, so as to nurture strong melon. Watermelon vine grows rapidly, branching is strong, how to use paclobutrazol to control the growing, reducing the workload of pruning, shortening vine length, increase density, for some vigorous growth, high yield watermelon varieties is very valuable.
Increase production and increase sugar, the effect of using sweetener: depends on the growth inhibition, due to inhibit the watermelon plant excessive vegetative growth, promotes the nutrients transfer and accumulate in fruit, thereby improving watermelon yield and fruit sugar volume, so it must be ensured watermelon plants have adequate nutrition, for growing strong varieties can be applied early, in the period of flowering to fruit spray 2 or 3 times, for weak growing varieties should postpone the use, in fruit enlargement period use one time. In addition, the fertilizer soil and strong seedlings can be sprayed early, the dosage should be large, thin weak seedlings should be sprayed later, the dosage should be small, so as to avoid excessive inhibit plant growth, reducing the effective area of nutrition and reduce its yield and quality.
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