Corn is a major food crop widely grown in the north and south of my country. However, if corn is to be harvested and produced year after year, chemical fertilizer management must be reasonable. From the corn seedlings to the later stages of corn stalk expansion, there must be enough nutrients at each stage. However, many farmer friends have poor fertilizer management when managing corn, and the corn has corresponding deficiency symptoms. Corn seedlings in the seedling stage often appear. "Phosphorus deficiency" is mainly caused by a serious lack of phosphorus in the soil.

Phosphorus mainly promotes cell division and flowering and fruiting of plants, especially the growth of lateral roots and capillary roots. The situation of plants is that as long as the roots are thick and developed, the ground parts tend to grow well, have abundant photosynthesis, and are highly resistant to stress. For corn, if the soil is sufficient in the seedling stage, its root growth is often relatively developed, the earing and silk spinning are strong, and it is not easy to fall down in the later stage.

Insufficient phosphorus in the seedling stage of corn, the plant root system is underdeveloped, there are few lateral roots and hairy roots, and the ground root stems are thin. If the firearm lacks phosphorus during the booting stage, the filament extraction is delayed, and the eggs are not enriched, the corn cobs are prone to problems such as bald spots, insufficient grains, and unbalanced grains. A simple way to determine whether corn is phosphorus deficient as soon as possible is to confirm whether the edge color of corn leaves is normal during the seedling stage. If the leaf edges are purple-red, it is most likely caused by a phosphorus deficiency.

As mentioned above, the peak periods when corn plants require phosphorus are the seedling stage, ear, flowering stage, etc. Therefore, attention should be paid to the transfer of phosphate fertilizer at this stage of corn growth to ensure that the soil contains sufficient phosphorus. Corn Quotes) When symptoms of phosphorus deficiency in corn are discovered at these stages, phosphorus should be replenished in time. Specifically, each mu of corn field can be ditched to catch up with 40 pounds of phosphoric acid, and 1% superphosphate solution can be sprayed during the booting stage.

In addition, the basic fertilizer should pay attention to the transfer of farm fertilizer. If conditions permit, you can also use the method of measuring soil formula fees to apply fertilizer correctly.

Corn suffers from phosphorus deficiency, differences in root system development, and slow growth in the seedling stage. The most prominent features are that the leaf tips and leaf edges of the seedlings are purple-red, and the rest are green or gray-green. The leaves are dull and the stems are weak. As the plant grows, the purple-red color fades and the lower leaves turn yellow. When some hybrids are deficient in phosphorus, the seedlings do not show purple-red symptoms, but the plants with phosphorus deficiency are significantly lower than normal plants. Therefore, the characteristics of the variety should be combined when diagnosing phosphorus deficiency. Phosphorus deficiency in corn will also affect moisture and grain filling, resulting in short ears, severe baldness, irregular grains, many grains, and delayed maturity.

Causes of phosphorus deficiency in corn

Phosphorus deficiency in corn is related to the available phosphorus content in the soil. The available phosphorus content in acidic soil, red soil, and yellow sheep is low. Phosphorus in calcareous soil is easily fixed and has poor efficacy. Phosphorus deficiency is prone to occur during low temperatures, humidity, and drought. Soil compaction affects the growth of roots, and plants' ability to absorb phosphorus is weakened. Too much nitrogen fertilizer is used, resulting in nutrient imbalance in plants. Insufficient use of phosphorus fertilizer, late fertilizer application, or improper fertilization location may all lead to symptoms of phosphorus deficiency. Methods to prevent and control phosphorus deficiency in corn

Phosphate fertilizer is generally used as base fertilizer. At normal fertilizer levels, phosphate fertilizer is evenly concentrated in the corn root area, helping to reduce root absorption and fixation. Strengthening field management, maintaining suitable soil moisture content, and preventing drought can improve phosphorus efficiency. When symptoms of phosphorus deficiency appear in corn, water-soluble phosphorus should be recovered in time. In the early stage, 20 kilograms of calcium phosphate per mu was used, and in the later stage, the leaves contained 0.2% to 0.5% potassium dihydrogen phosphate solution, causing symptoms of corn deficiency 2 to 3 times.