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Planting technology of sweet sorghum for forage
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Planting technology of sweet sorghum for forage

Forage sorghum, sudangrass and sorghum sorghum are all forages of the sorghum genus, collectively referred to as sorghum forages, which have the characteristics of early tolerance, heat resistance, salt-alkali tolerance and resistance to sorghum. Forage sorghum has a tall plant, high yield and strong resistance; Sudan grass has good regenerability, resistance to cutting, low hydrocyanic acid content and good forage quality; Gaodan grass is a hybrid of sorghum and Sudan grass, with high biological yield and regeneration Sex is between sorghum and Sudan grass.
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Forage sorghum, sudangrass and sorghum sorghum are all forages of the sorghum genus, collectively referred to as sorghum forages, which have the characteristics of early tolerance, heat resistance, salt-alkali tolerance and resistance to sorghum. Forage sorghum has a tall plant, high yield and strong resistance; Sudan grass has good regenerability, resistance to cutting, low hydrocyanic acid content and good forage quality; Gaodan grass is a hybrid of sorghum and Sudan grass, with high biological yield and regeneration Sex is between sorghum and Sudan grass.

1. Growth characteristics of sorghum pasture

Like warm and humid weather conditions. It takes 50-75 days from emergence to flowering for early-maturing varieties, 75-100 days for mid-maturing varieties, 100-125 days for mid-maturing varieties, and 125-150 days for mid-maturing varieties. Some varieties of short-day plants cannot bear fruit in the north. The growth rate is the fastest when the daily temperature is 27-32°C, and the growth stops at the daily temperature of 12°C and the night temperature of 4°C. Sensitive to frost, intolerant to shade, and need sufficient sunshine for growth. The soil requirements are not strict, and it can adapt to various soils such as clay and sand.

2. Cultivation technology

1. Land preparation

Combined with basal fertilizer for deep loosening or deep ploughing. The topsoil is trimmed as fine as possible, and then suppressed to form a seed bed of upper and lower pine. The best base fertilizer is decomposed organic fertilizer, the suitable amount is 30-45 tons/ha, and the compound fertilizer with high phosphorus content is used as the base fertilizer.

2. Seeding technology

Suitable for spring or summer sowing. When the surface soil temperature stabilizes to 10°C in spring, the seedlings will grow slowly when the temperature is low, and the growth will not resume soon after the temperature rises, so spring sowing should not be too early. Sowing in summer should be early, so as not to affect the yield. The row spacing is 15-30 cm, and the row spacing can be increased to 50 cm in dry and early areas. The planting depth is 1.5-3.0 cm, and the planting rate of irrigated land is 1.5-2.0 kg/mu. The increase of the planting rate and the reduction of the stem diameter are beneficial to increase the leaf-to-stem ratio of the forage. The early sown rate in the north is 1 kg/mu.

3. Water and fertilizer management

The better the soil moisture, the greater the amount of fertilizer applied. Nitrogen fertilizer is mainly used as top dressing, and nitrogen (N) 40-80 kg/ha is applied during the multiplication period and after each cutting. Phosphate fertilizer can be applied as a base fertilizer at one time, usually at a dosage of 30-60 kg/ha of phosphorus (P205), and can be increased to 120 kg/ha for plots that are particularly deficient in phosphorus. The amount of pressed fertilizer (K20) is generally 60-120 kg/ha, 1/3-1/2 of pressed fertilizer can be used as base fertilizer, and the rest can be used as top dressing together with nitrogen fertilizer. After emergence, proper foot seedlings will help To improve the early tolerance of plants.

3. Prevention and control of diseases, pests and weeds

Weeds: Soil sealing can be used with practical soil sealing herbicides in corn fields. After the ticket is divided, it is not easy to be harmed by weeds. Atrazine can be selected at the seedling stage. Broadleaf weeds can also be controlled by 2, 4-D and other herbicides at the seedling stage.

Pests: There are fewer pests in northern areas.

Four, harvest and use

It can be used for grazing, green forage, green guard and making hay. The mowing stays at a height of 10-15 cm, too low will affect regeneration. Green forage or hay: It can be mowed multiple times for green forage or hay. Forage sorghum is cut when the plant height is 70-120 cm, and the Sudan grass is cut when the height is 50-70 cm. The increase in lignification will reduce nutrition. Element. Silage It is best to choose varieties with high grain yield and cut them once in autumn to make silage. The suitable harvesting period is the wax maturity period. If you choose a variety that is not ripe in the middle of the day, the cutting is too early

Too high is not easy to silage, you can cut 1-2 times to produce hay, and then harvest the silage when the moisture content of the plant drops to 70% after the frost.

Five, cyanic acid

Sudan grass has a low content of hydrocyanic acid, so attention should be paid to it. Once hydrocyanic acid poisoning occurs, immediately detoxify with sulfur.

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Planting technology of sweet sorghum for forage
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