At present, the former glutinous wheat from Huanghuaihaixia corn is harvested by using a combine harvester. To improve the quality of summer corn sowing, experts from the national corn industry technical system reminded that the following aspects should be taken into account when carrying out joint harvesting operations among wheat fields:

1. Soil moisture. When harvesting wheat before harvesting, attention should be paid to field soil moisture. When the water holding capacity in the field is lower than 75%, the rolling of the wheat combine harvester has no significant adverse effect on the corn seedlings. However, when the field water holding capacity is more than 80%, the topsoil of the rolling belt is rapidly hardened and severely affects the emergence.

2. Wheat straw height. The height of stubble should not exceed 20 cm, which is unfavorable to the growth of post-harvest corn.

3. Wheat straw treatment. The wheat combine harvester with wheat straw smashing and scattering device is used. The wheat straw smashing length should be less than 10 cm and evenly dispersed. If there is no scattering device, it is manually dispersed evenly, or it is placed between the rows of corn to be sown so as to facilitate the sowing of corn.

What problems should be paid attention to when planting summer corn?

Different varieties in different regions

1. According to the actual planting situation, the selected species try to avoid the occurrence of waste of light and heat resources and insufficient maturity.

The varieties approved for summer maize in the northern part of the Huang-Huai-Hai (Beijing-Tianjin-Tangshan region) are subject to comprehensive traits such as adaptability, yield, quality, and resistance (resistance to disease, resistance to insects, resistance to stress). The varieties include Zhengdan 958, Yandan 20, Jingke 68, Zhongdan 909, Jingdan 38, Zhongke 11, Nonghua 101, Daiyu 35, and Jiyuan 1.

The selected varieties of summer maize in the middle Yellow-Huaihai region include Zhengdan 958, Yandan 20, Xindan 26, Weike 702, Jixiang 1, Denghai 605, Xianyu 335, Zhongdan 909, Ludan 981, Jinhai 5, and Zhongzhong. Section 11, Daiyu 16, Daiyu 35, Ludan 818, Liaoyu No. 22, Luoyu No. 8 and so on.

The summer maize in the south of the Huanghuaihai Sea is preferred to be dense and resistant to lodging and has been planted in the local area with excellent performance. The available varieties are Zhengdan 958, Yandan 20, Weike 702, Jixiang 1 and Xindan 26, first. Yu 335, Jinhai 5, Zhongke 11, Daiyu 16, Suyu 20, Longping 206, Denghai 605, Yifeng 29, Hongdae 8, etc.

2. Select high-quality seeds as well, pay attention to see if the four indicators of seeds (purity, bud rate, clarity, moisture) meet the national standards. The national seed standards for field crops are: purity ≥96%, bud rate ≥85%, netity ≥99%, moisture ≤13%. Pay attention to the preference for seeds with high germination potential. At present, yellow-Huaihai summer corn uses single-on-demand, requiring higher shoot rates.

3. When selecting varieties, attention should be paid to the collocation of varieties. In the larger planting areas, the collocation of different varieties should be taken into account to complement each other, and the ability to resist natural disasters, diseases and pests should be improved, and high-yield and stable production should be achieved. At the same time, attention should be paid to the local selection of crops, and areas with good conditions for water and fertilizer can be selected for high-density seed production; in accordance with the local climate characteristics and epidemic situation of diseases and insect pests, possible varietal defects should be avoided as far as possible; Dry areas should be properly selected early maturing varieties. It is preferred that the species has been grown and performed well in the area.

Prepare before broadcast

1. Species and fertilizer preparation: According to the selection requirements of varieties and fertilizer requirements, purchase seeds and fertilizers from regular outlets, request invoices and keep them properly. Seeds should try to buy coated seeds.

2. Front rake treatment: The wheat harvester with stalk crushing and spraying device is used for harvesting. The rake height should not exceed 20 cm, and the crushed wheat length should be less than 10 cm.

3. Early sowing and reasonable close planting: Summer corn in this area has relatively tight caloric resources, and often occurs from sowing to excessive precipitation at the seedling stage, resulting in “bud sprouts”, which should be sowed as early as possible after the harvest of the previous crop to promote single grain. sowing. When planting, seed (bottom) fertilizer ectopic seeding machine is used for sowing. All phosphorus, potash fertilizer and 40% nitrogen fertilizer are applied. Seed (bottom) and fertilizer are not less than 8 cm apart. When there is a lack of soil moisture, the head water is poured in time after sowing. In order to facilitate mechanical harvesting, it is recommended to soot 60 cm.

4. Proper close planting: The density is determined according to the species characteristics, ecological conditions and target yield, and the general seedling density is 4000-4500 strains/mu.

5. Pest Control: After spraying, seedlings are sprayed with chlorantraniliprole or pyrethroids and organophosphorus pesticides to kill the hidden pests in the wheat stubble.

6. Spray herbicides: Before sowing seedlings, weed and herbicides such as acetochlor should be used for weed control when the soil moisture is suitable.

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