Reasons and countermeasures of wheat without giving birth
The suitable temperature for sowing late-spring wheat tillers was 13-18°C, and the tillers were slower than 10°C; the tillers below 0°C were basically stagnant. The temperature at late sowing of wheat for delivery is relatively low. If it is improperly managed, it is very prone to the phenomenon of unbitterness. Countermeasures: Strengthen tillage and weed control, increase soil temperature, reduce soil nutrient loss, and conditionally cover 300-400 kg per acre to improve soil temperature and promote wheat tillering. Sowing too deep, according to the test, when the depth of 3 to 4 cm sowing of wheat seeds, the tillers are large and large, not lacking, and there is no abomination; when the sowing depth is 5 to 7 cm, the tillers are late in the evening, the tillers are small, and the absence phenomenon appears; When the sowing depth is more than 10 cm, the stem in the ground is 2 knots. There are a few primary roots at the eye section, and there is basically no birth. These types of wheat seedlings are short, with narrow and long leaves and underdeveloped secondary roots. Countermeasures: Timely cultivating loose soil, using a small side of the plan, open the wheat stem soil, exposing the tillering section, in order to accelerate the development of tillering. Too much density The density of wheat sown is too large, the number of basic seedlings per mu is too large, the closure of the line is premature, the ventilation and light transmission are poor, nutrients are consumed excessively, and there is little or no tillering. Countermeasures: timely vegetable seedlings, small areas of small seedlings can be manually removed; large area can be used to remove crops, remove part of the wheat seedlings, after the cultivator, in order to increase the temperature and increase. Insufficient nutrients After the three-leaf period of wheat, the required nutrients are mainly extracted from the soil. If the supply of nutrients is insufficient, especially nitrogen fertilizer is insufficient, the tillers are blocked, and when they are severe, they do not give birth. The main performance is that the plants are short, the stems are thin, the leaves are narrow and short, the leaves are yellow, the secondary roots are small and fine, and there are no tillers. Countermeasures: Immediately apply fertilizer, use 8 to 10 kg of urea per mu, or 20 kg of carbon iron, deep application; or use 600 to 800 kg of dilute human fecal urine per mu to pour. At the same time, foliar spray of 1%-2% urea solution or plant growth agent and other fertilizers can be applied. Soil shortages must be carried out under sufficient humidity conditions. The water holding capacity of the wheat during the tillering period should be 60% to 80%. When the water is insufficient, the root system can not be tied down. The leaves are born slowly and the tillers are reduced. Countermeasures: timely irrigation, suitable for small water irrigation, flood irrigation should not be flooded to prevent flooding washed wheat seedlings. In the overcast part of the cedar land, the humidity is relatively high, coarse ploughing and coarse mud deposits are spread all over the land, and some lands that have been pre-made for cultivating too late have poor cultivating quality due to hurried land preparation. There are also some wheat fields that have been solely used for chemical fertilizers for a long time. Severe soil compaction, soil preparation missed the appropriate tillage period, there is no fine plough more rake, soil dry fort is hard, clods overhead, cold wind blowing through the topsoil water loss, affecting the root extension and the normal growth of childbirth. The leaves of such wheat seedlings are dry, the tips of the leaves are dry, the plants are thin, the new leaves germinate slowly, the secondary roots are less and yellow, the root hairs are curled, and the tillers are stagnant. Countermeasures: Timely repression, crushing blocks, and cracks. The severity of the repression depends on the seedling condition. Before the 3-leaf stage, the stems and leaves are crisp and easy to break, and light pressure is better; after the 3rd leaf stage, the repression can be slightly heavier to avoid repeated rolling. Compression combined with winter irrigation for topdressing, in order to promote the weak and strong, increase the low birth.
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The thickest part of lamp-chimney is not more than 10cm.
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