Summer corn requirements for fertilizer: First, the total demand of summer corn has the largest total nitrogen, followed by potassium, and the least phosphorus. Generally, for every 100 kg of grain produced, it needs to absorb pure nitrogen 2.6-3 kg, phosphorus pentoxide 0.9-1.5 kg, potassium oxide 2.5-3 kg; Second, summer corn in different stages of growth, the absorption of nitrogen, phosphorus and potassium are different. Nitrogen uptake was less at the seedling stage and accounted for 2.1% of total nitrogen; absorption at booting stage accounted for 32.2% of total nitrogen; heading and flowering stage accounted for 19% of total nitrogen; grain formation stage, absorption This accounted for 46.7% of the total; for the absorption of phosphorus, the absorption at the seedling stage accounted for 1.1% of the total, the absorption at the jointing and booting stage accounted for 45.0% of the total, the stage of heading fertilization and grain formation, and the absorption accounted for 53.9% of the total. The absorption of potassium is very sensitive in the early stage, and then it rapidly declines with the growth and development of the plant. However, the absorption of potassium in summer maize rapidly increases after jointing and reaches the peak at the flowering stage and is absorbed.
According to the requirement of summer maize, combined with the soil conditions of the city, the output of summer maize is 600-800 kg per mu, which is generally based on the application of 2000 kg of organic fertilizer (3000-4000 kg of high-yielding field) in front of the loquat. Pure nitrogen 20-25 kg, phosphorus pentoxide 5-8 kg, potassium oxide 10-15 kg, zinc sulfate 1-1.5 kg, borax 0.5-0.75 kg. Fertilization methods: (1) Organic fertilizer, phosphate fertilizer, potash fertilizer, and microelement fertilizer are all applied before jointing, and can be used as base fertilizer, seed fertilizer, and seedling fertilizer, as early as possible. (2) Nitrogen fertilizer should be applied in stages, lightly applying Miaofei, heavy panicle fertilizer, and chasing flower fertilizer.
Miao Fei: Before the jointing of the maize, apply 30% nitrogenous nitrogen fertilizer with other fertilizers and apply it deeply to about 15 cm to strengthen the seedlings.
Pan-fertilizer: In the corn big bell-mouth period (11th to 12th leaves), topdressing 40%-50% of nitrogen fertilizer, topdressing method can be applied, or acupuncture, depth is about 15 cm, and it should be timely after application. Covering soil to promote large grains and more spikes.
Flowering grain fertilizer: In the grain filling stage, topdressing 15%-20% of nitrogen fertilizer to increase the photosynthetic capacity and increase grain weight.
The selection of compound fertilizers is based on the selection of controlled-release fertilizers. The use of controlled-release fertilizers for summer corn has the following three advantages: First, it ensures that there are sufficient fertilizers for the former, middle and later stages; Second, no fertilizers are used to save labor; Thirdly, the utilization rate of fertilizers is increased. Increase production.
According to the requirement of summer maize, combined with the soil conditions of the city, the output of summer maize is 600-800 kg per mu, which is generally based on the application of 2000 kg of organic fertilizer (3000-4000 kg of high-yielding field) in front of the loquat. Pure nitrogen 20-25 kg, phosphorus pentoxide 5-8 kg, potassium oxide 10-15 kg, zinc sulfate 1-1.5 kg, borax 0.5-0.75 kg. Fertilization methods: (1) Organic fertilizer, phosphate fertilizer, potash fertilizer, and microelement fertilizer are all applied before jointing, and can be used as base fertilizer, seed fertilizer, and seedling fertilizer, as early as possible. (2) Nitrogen fertilizer should be applied in stages, lightly applying Miaofei, heavy panicle fertilizer, and chasing flower fertilizer.
Miao Fei: Before the jointing of the maize, apply 30% nitrogenous nitrogen fertilizer with other fertilizers and apply it deeply to about 15 cm to strengthen the seedlings.
Pan-fertilizer: In the corn big bell-mouth period (11th to 12th leaves), topdressing 40%-50% of nitrogen fertilizer, topdressing method can be applied, or acupuncture, depth is about 15 cm, and it should be timely after application. Covering soil to promote large grains and more spikes.
Flowering grain fertilizer: In the grain filling stage, topdressing 15%-20% of nitrogen fertilizer to increase the photosynthetic capacity and increase grain weight.
The selection of compound fertilizers is based on the selection of controlled-release fertilizers. The use of controlled-release fertilizers for summer corn has the following three advantages: First, it ensures that there are sufficient fertilizers for the former, middle and later stages; Second, no fertilizers are used to save labor; Thirdly, the utilization rate of fertilizers is increased. Increase production.
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