Distinguish the difference between the eight types of wheat weak seedlings and the strong seedlings
Weak seedlings caused by soil drought. When wheat is sown at the end of the planting period, there is a shortage of ground stalks or rough, rough terrain. The appearance of wheat seedlings is gray-green, with few tillers, short leaves, slow growth, yellow and dry lower leaves, and small and fine roots. In terms of management, combined with watering or flooding rainfall, snowfall, chase 15 kg of ammonium per acre. Nitrogen deficiency causes weak seedlings. The performance is that the wheat seedlings are thin and erect, with few tillers, and the leaves are narrow and short. The lower leaves gradually turn yellow and dry from the tips of the leaves and develop toward the upper leaves. In the management of topdressing 8 kg of urea or about 25 kg of ammonium bicarbonate per mu, it is best to use a single leg to wear into the interline. Weak seedlings caused by phosphorus deficiency in soil. The main performance is poor root development, secondary roots are weak and weak, leaf color dark green and lusterless, leaf tips and leaf sheaths are purple, plants, C is small, there are few tillers, management must be combined with watering or planing, per acre Follow-up application of superphosphate 20-30 kilograms, chasing in the line between the top dressing or with a single leg to wear into, the sooner the effect of the top dressing, the better. Weak seedlings caused by soil compaction. The main reason is that excessive soil moisture is caused by mechanical rolling, or no-tillage sowing, lack of air in the soil, difficulty in roots breathing, and slow growth, which results in short yellow wheat leaves and no delay in tillering or tillering. Management watering in time, or after the precipitation, deep sloping soil, remove the compaction. Weak seedlings caused by excessive seeding. Mainly the seedlings are overcrowded, and the plants are weak and slender. Management should firstly sparse the seedlings, especially in the field and in the fields. It should be sparse and very sparse. Combined with watering or hoeing, it can be followed by a small amount of nitrogen and phosphorus fast-acting fertilizers to make up for the excessive consumption of soil nutrients and promote weak wheat seedlings. Turn strong. Deep sowing caused weak seedlings. It is characterized by slow emergence, thin leaf sheaths, no delays, no long secondary roots. Management first clears the earth and then timely fertilizer, applied 15 kg of ammonium per acre to promote the development of roots and seedlings. Weak seeding caused by shallow sowing. The main reason is that the tiller node is too close to the ground surface, and the ability to absorb water and nutrients is poor, so that the growth of the root system and the development of the tiller are inhibited. Usually, the root pods are reduced, the plants are weak, and they are easily frozen and die. Management, combined with planning, soil siege. Late seeding caused weak seedlings. Due to the short growing period before winter, the accumulated temperature is insufficient, resulting in the growth of wheat seedlings, weak C, and low birthing. On the management, the main program was supplementing fertilizer and supplementing water. In the 3-leaf stage, the application of ammonium bicarbonate was 15 kg. The soil moisture was poor, and the water content was drowned immediately after the 3-leaf stage. The soil with suitable soil moisture and poor water permeability was not suitable before winter. Watering, planing before freezing and smashing soil to protect the seedlings safely. Household Pvc Coated Gloves,Householding Pvc Dipped Gloves,Pvc Washing Household Gloves,New Household Pvc Gloves JINAN SHANDE SECURITY TECHNOLOGY CO., LTD , https://www.sdsxlb.com