How to manage the sorghum jointing heading period?

The management of jointing and booting of Sorghum should generally be based on promotion, coordinate vegetative growth and reproductive growth, ensure the good development of young panicles, and achieve large panicles and grains. Field management measures include:

1, re-apply joint fertilizer. In this period, the Gaosong required the most fertilizer. Therefore, if the base fertilizer is full and there is little fertilizer and only one fertilizer is available, it should be applied at the beginning of the jointing season or a few days in advance. If there is more fertilizer, or if there is a possibility of defertilization at the later stage, it should be After the principle of "light after", in two separate applications, that is, reapplying joint fertilizer, accounting for 2/3 of the total top dressing; light application of booting fertilizer, accounting for 1/3, in order to maintain flower growth (feeding and sugar use sorghum should be Less nitrogen fertilizer, more potassium phosphate fertilizer, in order to facilitate the accumulation of sugar, reduce the content of hydrocyanic acid, improve feed and sugar quality).

2, watering and drainage. The sorghum requires urgent water at the jointing stage and heading stage. However, the jointing stage is the period of internode elongation during the jointing period. Care should be taken to prevent premature filling and internode elongation, causing late lodging. Therefore, jointing water should be less irrigation, light irrigation, such as soil moisture in the field more than 75% of water capacity, you can not irrigation. Picking the flag at the booting stage, the water requirement is more urgent and the water requirement reaches a peak. Water demand during this period accounted for 35% of the total growth period. At this time, the drought will cause “card neck drought”, resulting in no panicles, severely affecting spikelet development, causing deterioration of spikelets and small flowers, and reducing seed setting rate and severely reducing yield. The soil moisture during this period should not be less than 70%, otherwise water should be promptly filled. Sorghum has strong anti-mite properties, but when there is too much precipitation and the soil is left standing for a long period of time, due to the lack of soil air, root decay and premature failure of stems and leaves are easily caused. Especially in low-lying, saline-alkali lands, leeches are often accompanied by salinity, which is more harmful to sorghum. Therefore, in low-lying areas, it is necessary to do a good job of preventing water from being drained in order to ensure high and stable production. In areas where there is a lot of rain and high groundwater levels in southern China, flood control is used to treat floods, and sorghum often uses squats. In the north, large ridges are used for planting sorghum and the ridges are high in depth, which helps eliminate water accumulation in the fields. In areas with high groundwater levels or even frequent flooding, strip fields and Taitian can be built to raise the field surface so that the root layer of the soil can be removed from the submergence, which can reduce the damage and increase the yield.

3, cultivator soil. After jointing, diligent cultivators, deep cultivators, can maintain loose soil, cut off part of the root system, inhibit the growth of the shoots, promote the occurrence of new roots, expand the absorption of water and fertilizers, and actively promote the formation of large culms and strong economic output. effect. The role of earth is to prevent lodging, conserve water, make the soil nutrients concentrated in the rhizosphere, and promote the roots of the air to the soil, and enhance the ability to absorb water and fertilizer. The cultivator usually starts after the jointing. The cultivator should be deep and can be below 10 cm. The latter cultivator should be combined with the soil to promote the long-term growth of the roots, and enhance the ability to prevent wind, lodging, drought and soil water retention.

4. Spray plant hormones. During the period of sorghum growth, timely spraying of certain plant hormones can regulate the relationship between plant vegetative growth and reproductive growth, prevent lodging, promote the absorption and operation of nitrogen and phosphorus, cause early flowering of plants, accelerate grain filling, early maturation, and increase production of commonly used plant hormones. There are ethephons, cajuns and so on.

5, timely prevention of pests, aphids and corn borer and other pests and diseases.

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