Wheat suffers from cold spring and freeze damage

After the spring weather warmed up, it suddenly became cold, and even frost appeared. This phenomenon is called "cold spring". Wheat is susceptible to freezing damage in the early stage of greening, and the yield of wheat is reduced by 10% to 30%, and the weight is more than 50%. Therefore, we must strengthen management and pay attention to preventing wheat frost damage.

Morphological characteristics of wheat after freezing

After the wheat ear is damaged by freezing, the tip of one of the top leaves of the plant is white, without heart leaves, forming an open space. Strip the leaf sheath layer by layer, from the bottom to the top, the second section of the tender bud folded, soft and dull, like hot water. If the second section is no longer stretched, the stem growth point has stopped growing. The cobs of the young ears are greenish white, the spikelets are milky white, the arrangement is slack, the water loss is wilting, and the yellowing death.

Pre-disaster prevention measures

Classification management should combine the characteristics of seedlings and weather changes to classify wheat fields, strengthen field management, and improve the cold resistance of plants. For excessive growth of wheat To "control" mainly to crack down, deep hoe, measures spraying plant growth regulator and the like, inhibit the excessive growth of wheat, wheat jointing avoid premature improve cold resistance, but can also Improve the lodging resistance of wheat. For the first time in the spring wheat field, the first fertilizer can be postponed until the beginning of the body or before and after the jointing.

For the general wheat field should be "promoted and controlled", first suppression, after shallow cultivating, in order to achieve the role of warming and protecting. Appropriate amount of topdressing and watering during the period of getting up, promote the growth of tillers, and strive for more spikes. For weak seedlings, we should focus on “promoting”, try to make early strokes, increase ground temperature, increase roots, pay attention to shallow strokes, and avoid root injuries. After returning to green, it is necessary to combine the sensational application of quick-acting nitrogen fertilizer. As long as the sensation of the weak seedling field is acceptable, watering should be avoided in early spring to avoid lowering the ground temperature. Generally, topdressing and watering are carried out in the late stage of greening or in the early stage of getting up.

Watering before freezing before freezing is one of the most effective measures to prevent cold weather. Before the arrival of the strong cold, the wheat field with the risk of freezing damage must be watered in time to adjust the microclimate near the ground layer, which can significantly reduce the freezing damage.

Adding organic fertilizer to the wheat during the jointing stage, adding some organic fertilizer, phosphate fertilizer and potassium fertilizer to promote root development, inhibit the aerial growth of wheat seedlings and enhance cold resistance.

Spraying the regulator before the arrival of the spring cold, the leaf surface spraying "blue crystal" or "Nongxi Shiluxu" and other nutrient regulators can improve the immunity of the plant and the ability to resist various disasters and reduce the harm.

Post-disaster remedy

Fertilizer and watering wheat are crops with tillering characteristics. The wheat fields that have suffered from early spring freezing will not freeze all of them, and small axillary buds can be long-formed into ears. As long as management is strengthened, a good harvest can still be obtained. Wheat that has been damaged by early spring damage should be immediately applied with nitrogen fertilizer and watering. The synergistic effect of nitrogen and water will promote wheat early tillering, small cockroach cockroach, increase tillering rate, increase the number of ears per acre, and thus reduce the damage of freezing damage. . Generally, about 10 kg of urea is applied per mu.

The cultivating and cultivating will increase the ground temperature, increase the number of tillers, and obtain a good harvest.

After spraying the foliar-fertilized wheat, the foliar spray of “Nongxi Shile” plus nutrient regulator or multi-anti-protease can promote the growth of wheat, and the performance is medium and The rapid growth of small tillers and the rapid development of latent buds.

Pest control is affected by frozen wheat fields and is more susceptible to pests and diseases. Control wheat sheath blight, powdery mildew and rust can be sprayed with 80% allicin + "benzazole" or " tebuconazole".

More pesticide knowledge , please pay attention to China Pesticide Network

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