Agronomy4future

Soybean growth is divided into two main phases: Vegetative (V) stages and Reproductive (R) stages. The vegetative stages are characterized by leaf and node development, while the reproductive stages begin with flowering and include pod development, seed development, and plant maturation. The reproductive stage R1, also known as the beginning bloom stage, is defined as having one open flower at any node on the main stem. This marks the start of the reproductive phase, even if the plant continues to produce new…

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Identifying the vegetative growth stages of soybean is crucial for effective crop management. These stages are marked by the development of trifoliolate leaves, which are a key indicator starting from the V1 stage. Here’s a brief guide on how to recognize these stages: ■ Emergence (VE) The first stage is emergence (VE), where the soybean seedling breaks through the soil surface. At this stage, the cotyledons, or seed leaves, are visible. They supply nutrients to the young plant before the…

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When pods contain green seeds that fills the pod at one of the four uppermost nodes on the main stem, it is usually called R6 (full seed). At R6 (full seed), seeds reach their maximum size in one or more pods on at least one of the four uppermost nodes. By mid-R6 (~R6.5), approximately 80% of the seed’s dry weight has accumulated. Subsequently, a few leaves may begin to turn, and some pods may appear lighter in color. ■ [Crop…

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Agronomy note □ Sowing date: 2023/05/18 □ V4: 2023/6/28 □ Flowering: 2023/08/01 □ R6: 2023/09/12 Three weeks ago, there was an insect problem on soybean leaves caused by Japanese beetles. After flowering, applying insecticide may not be advisable, and therefore I expressed my objection to such applications among several groups sharing the same field. Unless pods are damaged, it is less likely to affect grain yield at around R5. The current growth stage is R6 (full seed), and now I…

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