The normal growth and development of corn requires various elements such as nitrogen, phosphorus, potassium, iron, zinc, copper and manganese. In the three elements of NPK, the relative demand for nitrogen and potassium is relatively high, and phosphorus is less. According to the research data, for every 100 kg of grain formed by corn, it needs to absorb 2.5 kg of pure nitrogen, 1.2 kg of phosphorus pentoxide, 2.0 kg of potassium oxide, and the ratio of NPK is 1:0.48:0.8. The fertilizer requirement increases with the increase of yield level. .
Different varieties and yield levels of maize are slightly different. Generally, the whole maize growth period requires the application of 10-16 kg of pure nitrogen and 3-5 kg ​​of phosphorus pentoxide. In addition to the low-yield fields in the western and northern parts of Shandong, it is also required to be oxidized. Potassium 5-8 kg (see the attached table for the amount of corn fertilizer applied at different soil fertility and yield levels).
The maximum efficiency of corn nutrition is in the big bell stage, the critical period of phosphorus nutrition is in the three-leaf stage, and the critical period of nitrogen is later than that of phosphorus, usually in the period when vegetative growth turns to reproductive growth. The critical period has little demand for nutrients, but the nutrients should be comprehensive and the proportion should be appropriate. According to the supply of soil nutrients, elements such as zinc, boron and manganese are used in a targeted manner due to lack of supplements. In the staged use, according to the corn before the need for fat jointing, the period of jointing to the big bell mouth is the most, and then gradually reduced the law, the proportion of base fertilizer and top dressing is rationally adjusted.
First, the base fertilizer
Before the land preparation, about 30% of the nitrogen fertilizer, all the phosphate fertilizer, and more than 50% of the potash fertilizer should be applied at the same time. The organic fertilizer can be applied with 1000-1500 kg of organic fertilizer. It can be applied to the seeding ditch once in combination with the ploughing ridge, so that the fertilizer can be applied to the 10~15 cm plough layer. It is recommended to apply 1 kg of zinc fertilizer in the tidal zone in northwestern Shandong. It is best to apply the shovel furrow when applying, and turn it deep in time. When this method is inconvenient, it can be evenly spread on the surface before arable land, and it can be ploughed into the soil in time. The plots that are inconvenient to apply base fertilizer can be applied in the seedling stage or applied at a depth of 7 to 10 cm.
Second, top dressing
The total amount of topdressing is about 60% of total nitrogen application and 50% of potassium fertilizer. Top dressing is generally carried out twice, and can be applied twice after 10 days after jointing and 10 to 15 days before corn plucking, before being light and heavy (master ratio 2:3). The one-time fertilized plot can be applied once in the early stage of the big bell. The method of topdressing can generally be applied, or it can be applied at a point. The depth of fertilization is 7-10 cm, and it should be covered in time after application. When the soil moisture is insufficient, it is necessary to water it in time after topdressing, but do not flood the water.
Source: Rural Volkswagen
Different varieties and yield levels of maize are slightly different. Generally, the whole maize growth period requires the application of 10-16 kg of pure nitrogen and 3-5 kg ​​of phosphorus pentoxide. In addition to the low-yield fields in the western and northern parts of Shandong, it is also required to be oxidized. Potassium 5-8 kg (see the attached table for the amount of corn fertilizer applied at different soil fertility and yield levels).
The maximum efficiency of corn nutrition is in the big bell stage, the critical period of phosphorus nutrition is in the three-leaf stage, and the critical period of nitrogen is later than that of phosphorus, usually in the period when vegetative growth turns to reproductive growth. The critical period has little demand for nutrients, but the nutrients should be comprehensive and the proportion should be appropriate. According to the supply of soil nutrients, elements such as zinc, boron and manganese are used in a targeted manner due to lack of supplements. In the staged use, according to the corn before the need for fat jointing, the period of jointing to the big bell mouth is the most, and then gradually reduced the law, the proportion of base fertilizer and top dressing is rationally adjusted.
First, the base fertilizer
Before the land preparation, about 30% of the nitrogen fertilizer, all the phosphate fertilizer, and more than 50% of the potash fertilizer should be applied at the same time. The organic fertilizer can be applied with 1000-1500 kg of organic fertilizer. It can be applied to the seeding ditch once in combination with the ploughing ridge, so that the fertilizer can be applied to the 10~15 cm plough layer. It is recommended to apply 1 kg of zinc fertilizer in the tidal zone in northwestern Shandong. It is best to apply the shovel furrow when applying, and turn it deep in time. When this method is inconvenient, it can be evenly spread on the surface before arable land, and it can be ploughed into the soil in time. The plots that are inconvenient to apply base fertilizer can be applied in the seedling stage or applied at a depth of 7 to 10 cm.
Second, top dressing
The total amount of topdressing is about 60% of total nitrogen application and 50% of potassium fertilizer. Top dressing is generally carried out twice, and can be applied twice after 10 days after jointing and 10 to 15 days before corn plucking, before being light and heavy (master ratio 2:3). The one-time fertilized plot can be applied once in the early stage of the big bell. The method of topdressing can generally be applied, or it can be applied at a point. The depth of fertilization is 7-10 cm, and it should be covered in time after application. When the soil moisture is insufficient, it is necessary to water it in time after topdressing, but do not flood the water.
Source: Rural Volkswagen
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