First, the amount of fertilizer required for corn and the composition of the output of fertilizer is the crop's food, in order to obtain higher yields, there must be sufficient fertilizer guarantees. According to the experimental analysis, for every 100 kilograms of seed produced by maize, it is necessary to absorb 2.1-2.8 kg of nitrogen, 0.7-1.7 kg of phosphorus pentoxide and 1.5-3.0 kg of potassium oxide. Second, the need for corn fertilizer characteristics Corn in different growth and development period of the proportion of nutrients are also different. 1. Three-leaf to jointing period. With the growth and development of seedlings, the consumption of nutrients is also increasing. Although the demand for nutrients during this period is still relatively small, but the basis for high yields, only meet the nutritional needs of this period in order to obtain high-quality seedlings. 2. Jointing stage to heading stage. This period is an important period for the formation of corn ear, and it is also the period with the highest demand for nutrients. Nitrogen absorbed during this period accounted for 1/3 of fertility, phosphorus accounted for 1/2, and potassium accounted for 2/3. In this period, if the nutrient supply is sufficient, the corn plants can be tall, with thick stalks, and large spikes and grains. 3. Heading and flowering period. At this stage, the growth of the plants was basically completed. During this period, nitrogen consumption accounted for 1/5 of the total nitrogen, phosphorus accounted for 1/5, and potassium accounted for 1/3. 4. Grout until mature. After the grouting is started, the amount of fertilizer required by the corn increases rapidly to form the protein, starch and fat in the grain until it matures. Nitrogen absorbed during this period accounted for 1/2 of the entire growth period and phosphorus accounted for 1/3. Third, the lack of symptoms of corn plant performance 1. Nitrogen deficiency. Nitrogen has a great influence on the growth and development of corn. In the early stage of growth, when maize has insufficient nitrogen, the plants grow slowly and appear yellow-green. When the nitrogen is insufficient in the vigorous growing season, the plants are pale green and then turn yellow. At the same time, the lower leaves began to dry, gradually reaching the midrib from the middle of the leaves, and finally dried up. 2. Phosphorus deficiency. During the whole process of growth and development of maize, there are two periods of the most vulnerable to phosphorus deficiency. The first period is the seedling stage: before the corn germinates to the three-leaf stage, if the phosphorus is insufficient during this period, the lower leaves begin to appear dark green, and then begin to appear purple from the edges; when the extreme lack of phosphorus, the leaves edge from the tip It starts to turn brown and it grows more slowly. The second period is the flowering period: During the flowering period of maize, the phosphorus in the plant begins to transfer from the leaves and stems to the grains. If the phosphorus is lacked at this time, the pistil filaments are delayed and the plants are incompletely fertilized, and the seeds will often grow to be distorted. Malformed ear. 3. Potassium deficiency. The lack of potassium in maize seedlings, plant growth is slow, stems dwarf, yellow leaves or yellow-brown leaves; severe potassium deficiency, the edge or the top of the fire-like edges. When the older plants lack potassium, the veins turn yellow, the internodes shorten, the roots grow weakly, and they are easy to fall down. The grain is small, the yield is low, the shell starch is less, the quality is poor, and the grain matures late.
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