The double-season sorghum cultivation in Chongqing has yielded good results. In recent years, more and more farmers and enterprises have participated in sorghum production. At present, it is the key season for sorghum sowing and seedling cultivation. The key technologies for sorghum sowing and nursery are introduced as follows:
The first is the selection of high-quality sorghum varieties with strong regenerative power. There is a great difference in the regenerative capacity among sorghum cultivars. At present, the sorghum 8 cultivar in large-area double-season sorghum production has a good effect. In 2014, the high yield in Rongchang County typically reached the double-season sorghum yield per ton of grain. In general, it is necessary to raise seedlings with 500 grams of No. 8 seeds.
The second is the sowing of seedlings. Early seeding and seedling cultivation is an important part of double-season sorghum cultivation, and the minimum temperature for sorghum sprouting is 8°C. The use of mulching with plastic mulching can increase mud temperature by 2-3°C, which is beneficial to safe early sowing of double cropping sorghum. Double-season sorghum at low altitude in Chongqing can be planted in early March.
The third is to do a good soaking germination. The soaking and germination of the double-season sorghum seeds prior to sowing can increase the seedling emergence rate of the sorghum seeds by 15-40%, and the seedlings can emerge 3-5 days earlier.
The fourth is to do seed treatment. Anthracnose and smut are common diseases of sorghum. Before sowing, 50% carbendazim wettable powder is used for seed dressing. The dosage is 0.5% of the seed weight, and the effect of controlling smut is more than 80%.
Fifth, do a good job dilute seedling breeding. Usually 500 grams of No. 8 sorghum seeds, seed 15-20 square meters of seedlings, after sowing covered fine soil 2-3 cm.
Sixth, we must do so by stages. The scale of planting sorghum is larger and can be planted in stages, or the combination of nursery and direct seeding can reduce the labor conflict in transplanting sorghum and avoid planting old seedlings.
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