What causes early heading in rice? How to prevent and control it
During rice cultivation, the phenomenon of early heading in rice can occur. So-called early heading in rice refers to the phenomenon in which the young panicle of the main stem of rice begins to differentiate or form during the seedling stage, and then heads too early after transplanting. This causes the plant type of rice to be noticeably reduced, the panicles to shrink, and yields to drop sharply. So what causes this phenomenon? How should it be prevented and controlled? Let's take a look at the detailed introduction from Qinong Web.
1. Poor seedling quality
When sowing, the quantity is too large, causing the seedlings to emerge too densely, and combined with improper management, the seedlings grow thin and weak, and the growth cycle is continuously shortened, leading to the phenomenon of early heading. In addition, sowing too densely makes the seedlings grow crowded, causing weak seedling growth, and after transplanting the seedling recovery period is long and tillering is delayed, which can also lead to the phenomenon of early heading.
Control methods: Strictly control the sowing rate and pay attention to the growth density of the seedlings. If they grow too densely, thin them out in time. In addition, cultivate strong seedlings to improve the overall quality of the seedlings. This prevents the occurrence of early heading.
2. Transplanting seedlings that are too old
Generally, rice varieties have little flexibility in seedling age, but if the transplanting seedling age is too old and the accumulated temperature required by the variety is met, young panicle differentiation will begin early, forming the phenomenon of early heading. Therefore, the transplanting seedling age of rice is closely related to the phenomenon of early heading. When the seedling age is appropriate, the rooting ability of the seedlings is strong and the plants grow vigorously; but if the seedling age is long, its rooting ability is weaker and its growth is weak, and combined with improper management, it recovers slowly after transplanting, which leads to rapid heading.
Control methods: Improve the quality of the seedlings. When transplanting, it should not exceed the seedling age period. If the best time for transplanting is exceeded, heavy fertilization can be applied in the paddy field to coordinate the vegetative growth of rice and reduce the occurrence of early heading.
3. Climatic reasons
During the seedling-raising period, if there is continuous long-term high-temperature and drought weather, under an environment with sufficient sunlight, rice will grow extremely quickly and enter the reproductive stage early. At this time, if it is not transplanted in time, the phenomenon of early heading will occur because the transplanting seedling age is too old. In addition, the reason rice heads is that after reaching the accumulated heat required for its growth, it will begin to head, so during periods of high temperature and sufficient light, the phenomenon of early heading is very likely to occur.
Control methods: Pay attention to changes in seasonal climate. If there is a continuous period of high temperature and drought, find a way to lower the temperature, water to increase soil moisture, or transplant early, which is also acceptable.
4. Improper fertilization management
Poor seedling quality, poor seedling quality, plus improper fertilizer and water management can also lead to the phenomenon of early heading in rice. For example, when fertilizing, nitrogen fertilizer is applied too late or insufficiently, causing weak plant growth and inhibited growth, which makes the main stem enter reproductive growth early and causes early heading.
Control methods: When fertilizing, it must be done according to the soil and the growth status of the rice. It must be applied sufficiently and early, and attention must also be paid to the rational application of nitrogen, phosphorus, and potassium fertilizers.
The above are the causes of early heading in rice and the control methods brought to you by Qinong Web. The content about early heading in rice is introduced here. We hope it can help you. If you want to learn more, please stay tuned to Qinong Web.