The northeastern part of Sichuan is a typical hilly and arid mountainous area. In recent years, through the active exploration of the majority of agricultural science and technology workers, the autumn corn planting area is stable. Autumn corn production has become a major supplement to grain production in hilly mountainous areas. The following points should be noted:

Selection of good varieties

The climatic conditions of autumn corn growth period are special: high temperature and drought in the early stage, and autumn rain in the late stage. Therefore, high-yield hybrids with high temperature tolerance during seedling stage and fast grain filling and good resistance should be selected. Generally, the autumn sowing period is about 100 days, and the plant type is compact, the stem is thick, the resistance is strong, and the variety is high and stable. Such as group policy No. 8, Denghai 3329, Jinyu 308, etc., can also develop sweet corn.

Sowing at the right time

Tongjiang County mainly promotes the double-five-point rotation system of dry land. The autumn corn is mainly based on the three-crop of “wheat-yu-苕” or “芋-玉-苕” in the dry land, and then planting a season of corn in the spring corn harvesting line. , reaching four seasons a year. The sowing date should be planted around July 15th, 7-10 days before the spring corn harvest. In the middle and late stages of spring corn grouting, the lower leaves of the ears are shaved in time to facilitate the ventilation and light transmission of the autumn corn. After ripening, the inverted stalks are harvested in time to reduce the symbiosis and the shade, so as to promote the growth of autumn corn. The amount of seeds used per acre of field is 2 to 3 kg. In order to ensure that the seedlings are planted, they are usually seeded by live broadcast, and 3 to 4 seeds are placed in each litter, the depth is 5-6 cm, and the soil is kept moist after sowing.

Reasonable close planting

Reasonable close planting refers to the formation of a reasonable group structure on the basis of appropriate rows and plant spacings, so as to achieve an ideal yield structure. Planting a row of autumn corn in the spring corn planting belt, carrying out single row and double planting, the row spacing is 45-50 cm, the nest distance is 20-25 cm, and the basic seedlings are about 3000.

Strengthen the field tube

Timely check seedlings to replant and fill the gap. After sowing seedlings, it is necessary to timely check and replant seedlings and replenish seedlings. Check the seedlings every 3 days, and replant and replenish the seedlings in time.

And time seedlings, set seedlings. The autumn corn is broadcast live, and the seedlings are planted at the 3 leaf stage and time seedlings, and the seedlings are timely in the 4-5 leaf stage. Each nest has 2 plants, leaving large seedlings, strong seedlings, and preserved seedlings.

Scientific fertilization. Autumn corn needs a large amount of fertilizer, and scientific topdressing is very important for capturing high yields. First, early application of seedling fertilizer to promote seedlings and strong, in the Qi Miao, the application of ammonium bicarbonate 30 kg per mu, phosphate fertilizer 25 kg per mu, digging in the middle of the two nests. The second is to apply the jointing fertilizer in the 5-6 leaves, promote the differentiation of young ears, apply 20 kg of ammonium per acre, and dig the nest in the middle of the two nests. The third is to apply heavy panicle fertilizer. In the large trumpet period of autumn corn, one-time application of ammonium carbonate is 40 kg per mu or urea is 15-20 kg. Fourth, after the tasseling, depending on the growth of the corn, increase the application of granular fertilizer, 3-5 kg ​​of urea per mu, increase the grain weight.

Cultivate weeding. After sowing and emergence, the seedlings should be combined with timely cultivating, promoting root ventilation and soil lodging prevention; weeds in autumn corn can be applied with selective herbicides or artificial weeding, usually in weeds 3-5 pages, sulphur grass Atrazine 50 g with water 30 kg for directional spray.

Drought-proof and anti-staining seedlings. After the autumn corn is planted, the soil must be kept moist to facilitate the emergence of seedlings; if there is drought in the middle and late stages, it can be watered once or twice; in case of autumn rain, it is necessary to drain and prevent water stains in time.

Control pests and diseases. The diseases of autumn corn mainly include: large and small spot disease, sheath blight, base rot, stem rot, and black powder disease. Generally, mixed control of Jinggangmycin and carbendazim at the seedling stage and ear stage is carried out 2-3 times. The main pests are seedlings, armyworms, etc., which are controlled by phoxim. At the seedling stage and the ear stage, there are mainly corn borer and aphid. In the 4th, 6th and large bell mouths, insecticides such as chlorpyrifos, mala and chlorpyrifos are used to control pests such as corn mash; The acetamiprid is sprayed with 1000 to 1500 times of liquid to prevent pests such as aphids.

Timely harvest

More than 90% of the whole plant's stems and leaves turn yellow, the ears of the leaves are white, and the grains become hard. When the grain color of the variety is revealed, the corn is mature and harvestable. (