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Spring sowing peanut seedling management technical measures
Peanut seedlings are primarily in the vegetative growth stage, and this period is also crucial for flower bud differentiation. During this phase, the above-ground parts grow slowly, while the roots develop rapidly. The nutrients produced by the plant are mainly directed towards root development and the formation of flower buds. Therefore, the main goal of seedling management is to control the growth of the above-ground parts appropriately, ensuring that the seedlings are strong but not overly vigorous. This helps achieve sturdy seedlings with thick stems, well-developed branches, dense nodes, and a robust root system, which creates ideal conditions for abundant flower bud formation and eventual blooming.
The key seedling management techniques include:
First, thinning the seedlings by gently pulling soil around them so that the two cotyledons are exposed above the ground. This helps free the first pair of lateral branches, allowing them to grow more effectively. It’s important not to damage or remove the cotyledons, as they play a vital role in the development of the first lateral branches and the subsequent growth of secondary branches.
Second, during weeding and cultivation, it's essential to loosen the soil after rain. About 15–20 days after planting, the first pair of lateral branches will begin to penetrate the soil. When the second set of branches reaches the height of the cultivator, it's time to perform the second round of weeding. This involves loosening the ridges, raising the soil, and removing the top growth, while leaving weeds intact. After the plants have been cleared, the ridges should be shallow, and the areas between rows should be deep. Mulching helps suppress weed growth by covering the soil tightly and blocking light, causing weeds to yellow and die.
Third, pest control is critical during this stage. Insects such as locusts, aphids, mites, and spider mites can be controlled using insecticides like omethoate (diluted 800 times) or 10% imidacloprid wettable powder (diluted 2500 times). For underground pests, phoxim can be sprinkled around the field in the evening to prevent and control infestations. Proper monitoring and timely intervention are essential to protect the young peanut plants from damage and ensure healthy growth.
The valve stem is an important part of the valve.
It is used to drive, connect the actuating mechanism or handle, and directly
drive the spool to move or rotate, so as to realize the function of valve switch
or regulation.Valve stem in the valve opening and closing process is not only
moving parts, stress components, but also seals. At the same time, it is
subjected to the impact and corrosion of the medium, and it also causes friction
with the packing. Therefore, in selecting the stem material, it must be
guaranteed that it has sufficient strength at the prescribed temperature, good
impact toughness, scratch resistance, corrosion resistance. The valve stem is a
vulnerable part, and the mechanical performance and heat treatment performance
of the material should be paid attention to when selecting.The valve stem in the
valve opening and closing process, under tension, compression and torsion force,
and direct contact with the media, as well as the relative motion between the
friction and filler, so in the choice of stem material, must ensure that it
provides adequate temperature strength, good impact toughness, abrasion
resistance and corrosion resistance of.