When is the ripening season of sorghum?

Sorghum sown in spring usually ripens between beginning of autumn and summer (mid-August in the solar calendar). "Three-day sickle ringing in beginning of autumn" refers to the mature harvest period of millet, and the mature period of sorghum is about one week later than that of millet. Generally speaking, phenology is gradually delayed from south to north (about one day every 50 kilometers)

Different regions have different phenological periods, and there are many differences in sowing dates of sorghum in different regions, so the maturity and harvest periods of sorghum are also different. The growth period of sorghum is generally around 100 days. Take Lunan (Lanling County) as an example. Sorghum sown in spring (in late April) is usually harvested in the middle of August in the solar calendar.

Extended data:

Sorghum propagation method:

First, seed treatment

1. Seed selection and seed drying: before sowing, wind selection or screening shall be carried out to eliminate small, shriveled and diseased seeds, and large and full seeds shall be selected as production seeds. At the same time, choose sunny weather and dry the seeds for 2-3 days to improve the germination potential and germination rate of the seeds.

2. Chemical seed dressing: high-quality seed coating agent can be selected for chemical seed dressing before sowing to prevent smut, seedling diseases, deficiency diseases and underground pests. Seed dressing with 25% triadimefon wettable powder or 40% triadimefon wettable powder at 0.3%-0.5% can also be used to control head smut.

Second, fine sowing.

1, sowing date: timely sowing is the key to ensure the whole seedling, the whole seedling and the Miao Zhuang. Sorghum seeds are not tolerant to low temperature when they germinate, and germinate too early and too slowly, which is easy to be infected by bacteria, leading to powdery or moldy seeds, which will also increase the occurrence of head smut and affect the yield. The sowing date is determined according to the variety growth period, ground temperature and soil moisture.

Generally, the ground temperature of 5 cm plough layer is stable at 10- 12℃, and the soil water content is 15%-20%. Sow late-maturing varieties early and early-maturing varieties late. Grasp the best sowing date according to the plot: sow early in time in mountainous areas, sloping fields and Chaoyang plots with serious spring drought; Low-lying areas are prone to waterlogging, and flat land is suitable for late sowing. In normal years, it is suggested that the second and third accumulated temperature areas should be planted during May 5- 10.

2. Sowing density: Sowing density is based on the principle of "fertile land should be dense and thin land should be thin". Generally, the ridge is 65-70 cm, with double rows of equidistant drilling on the ridge, and the seedlings are extended, with small row spacing 12- 15 cm, plant spacing 18-20 cm, and seedling protection 120,000-150,000 square hectares.

The suitable planting density of dwarf varieties should generally reach 6.5438+0.5 million-6.5438+0.8 million square hectares. The general sowing amount is 15-22.5 kg square hectare. Select the drill precision seeder or air suction precision seeder, and suppress it in time after sowing.

3. Sowing depth: The appropriate sowing depth is 3-4.5 cm. Low-lying and wet places can be slightly shallow, covering 2-3 cm with soil. The dry land should be germinated, watered and planted, and the soil should be covered tightly. The sowing depth of different soil types should be flexibly mastered, and the clay soil is dense and easy to harden, so shallow sowing is suitable; Sandy soil has poor moisture conservation and can be deeply sown.

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