At what stage is it most appropriate to apply growth-regulator (vigor-control) medication to peanuts?

Peanuts need growth control during their growth process, otherwise they tend to grow excessively, so at what stage should peanut growth control be applied? Let's take a look!

1. Why do peanuts need growth control?

1. Prevent plant lodging

When peanuts have sufficient water and fertilizer, high temperatures and good light, their growth speed accelerates, making it very easy for stems and leaves to grow excessively. If not controlled in time, the peanut plants will become too tall and prone to lodging.

2. Prevent pods from being unfilled and yield reduction

If the nutrients of the peanut are all absorbed by the stems and leaves, the nutrients absorbed by the pods will decrease, resulting in unfilled fruit, and at the same time it will also cause premature aging when the peanuts form fruit in the later stage, thereby affecting peanut yield and quality.

2. At what stage should peanut growth control be applied?

Peanut growth control can be applied at the full flowering stage, the early flowering stage, from the late pegging stage to the early pod-setting stage, or when the main stem height is 35-40cm. Among these, at the full flowering stage, use 50g of 15% paclobutrazol per mu mixed with 30 jin of water for spraying; at the early flowering stage, spray the plants with a uniconazole solution of 50-100mg per liter; from the full flowering stage to the pod-setting stage, spray the plants with a chlormequat solution of 200-500mg per liter. Using it continuously 2-3 times will have a very good growth-control effect.

3. What varieties of peanuts are there?

1. Dragon-type

The plant is prostrate and flowers alternately. The pods have a keel (dorsal ridge) and a hooked beak, and are hockey-stick shaped. The pod shell has deep reticulation, and the pegs are fragile and break easily.

2. Multi-seeded type

Each node of the lateral branches can bear inflorescences, with very few secondary branches. The main stem has inflorescences, and the stems and branches have obvious anthocyanins. Pods with 3-4 seeds account for the majority, and the seeds are cylindrical.

3. Common type

Inflorescences alternate on the lateral branches, the leaves are obovate, and the plant cluster is upright, clustered, or even prostrate. The fruit shape is relatively large. The seeds are long cylindrical. The growth period is relatively long.

4. Pearl bean type

The lateral branches are close to the main stem and can continuously bear several inflorescence nodes, with only a few secondary branches. The leaves are elliptical, light green or green. The plant is upright or clustered. The fruit shape is relatively small. The seeds are peach-shaped. Dormancy is weak.