Cultivation methods of Onion intercropping Maize

This model is suitable for popularizing and planting in Sichuan water area with better hydrothermal conditions. The general yield is 7500 kg / ha of corn and 57000 kg / ha of onion, with an output value of 38000 yuan / ha and a net income of 32250 yuan / ha.

1. Planting form

Onions were sown in mid-late September with a row spacing of 20 cm, and in the middle of April of the following year, corn was interplanted in the rows between onions, with a row spacing of 40 cm, a plant spacing of 35 mi / 40 cm, and a seedling protection of 61500 plants / ha-72000 plants / ha.

2. Main technology

2.1 selecting stubble and soil preparation, applying sufficient basic fertilizer, selecting stubble such as wheat or potato, turning the soil deeply after harvest, shallow ploughing and raking before sowing, eliminating bumpy, fine broken soil, upper and lower solid, and smooth surface, to achieve the goal of storing water and preserving soil moisture, drought resistance and whole seedlings. Combined with pre-sowing shallow tillage application of agricultural fertilizer 45000 kg / ha, pure nitrogen 225kg / ha, pure phosphorus 90kg / ha.

2.2 select improved varieties and select varieties with good yield and strong stress resistance for sowing at the right time. Generally, onion varieties such as Xi'an Dahongpi and Yefu 1 are selected, while Zhongdan 2 or Yedan 13 is selected for corn. Sow onions in mid-late September. After sowing, the soil is stabilized and flattened, and a fine sand 2cm thick is laid, so as to increase temperature, preserve soil moisture and prevent consolidation. In the middle of April of the following year, plant corn between onion rows.

2.3 strengthen field management of onion seedlings in late March, set seedlings in early April, plant spacing 16 cm, protect seedlings 300000 plants / ha, and topdressing 60 kg / ha of pure nitrogen. At the same time, maintain soil moisture and promote seedling growth. In the middle of June, weeding and loosening the soil, controlling fertilizer and water, promoting the root system of maize, accelerating the transfer of onion nutrients to the bulb and promoting bulb expansion. In the first ten days of July, the amount of topdressing was 75kg / ha. To promote bulb expansion, the soil should be kept moist until the onion harvest in late July. After the onion was harvested, the corn was topdressing 120 kg of pure nitrogen per hectare, followed by soil ridging and irrigation. After that, potassium dihydrogen phosphate and zinc fertilizer were sprayed twice every 15 days to ensure the nutrient demand of maize in the middle and later stage and achieve the goal of increasing yield and income. Irrigation during filling period to promote grain filling and prevent premature senescence.

2.4 do a good job in pest control while implementing agricultural measures such as crop rotation and increasing fertilizer to prevent and treat onion plant mildew, pesticides such as 90% triethyl aluminum phosphate wettable powder 400 pay 500 times solution and 75% chlorothalonil wettable powder 600 times solution are used to control onion plant mildew at the initial stage of the disease, and the control effect can be better when sprayed twice every 10 days. Botrytis cinerea onion is usually sprayed with 2000 times of 50% Sukeling wettable powder. Corn borer and armyworm can be irrigated with 1000 times solution of permethrin 800 or sprayed to control the armyworm.