After the soybean enters the squash stage, the growth of vegetative organs such as roots, stems, and leaves gradually stagnates, while the activity of the material in the plants is active. Organic matter and mineral nutrients accumulated in the vegetative organs continue to flow to the solid organs - pods, grains, photosynthetic leaves. The role continues and is the period when the accumulation of dry matter in soybeans is the most. The normal development of this period determines the number of grains per grain and the height of 100 grains. The main objective of this period is to preserve, increase grain, and promote fullness. Management measures are to prevent plant lodging and premature aging.
1, timely spraying fertilizer. In the early days of drum grain, if there is a phenomenon of premature aging, the foliar fertilizer should be applied in time. Use 300-500 grams of urea, 150 grams of potassium dihydrogen phosphate, 15 grams of ammonium molybdate, and 40-50 kg of water per acre. Spraying.
2, timely filling drum water. Drum period is the period when soybeans need the most water. At this time, if the water supply is insufficient, it will affect the active life process of the plant and affect the absorption and utilization of soil nutrients by the root system, resulting in a small grain and reduced yield. Therefore, we should do a good job of water management during the grain period. If the drums are in early drought stage, irrigation of grain water can significantly increase grain weight and yield and improve soybean quality. Drum grain reduces soil moisture at the later stage, promotes early maturation of yellow peony and prevents early frost damage.
3, remove field weeds. After cultivating, the weeds in the soybean line still have some residual. Especially in the later period of childbirth, the high temperature and high humidity, the rapid development of weeds between the rows, and the high growth, compete with soybeans to compete for water and must be cleared as soon as possible. Before weed seeds are immature, field weeds are manually removed.
4, prevention and control of aphid pests. The pests that damage the soybean pods and grains during the grain-blast period mainly include soybean borer and soybean meal.
5, timely and modest harvest, soybean on the harvest period is strict, when the beans leaves 90% fall off, all stems and pods yellow, wolfberry seeds and sacral wall from the separation, shaking the plant by hand, that is the best harvest.
Note: During the soybean graining period, high temperatures will directly reduce the vigor and quality of the soybean grain. Around 33 degrees Celsius, the abnormally developed grains account for >50% of the total, and around 38 degrees Celsius, the abnormally developed grains are close to 100%. Low temperatures will lead to slower dry matter accumulation and lower yields.
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