Weak seedlings caused by nitrogen deficiency in soil. The seedlings are thin and upright, with fewer tillers and narrower leaves. The lower leaves start from the tips of the leaves and gradually turn yellow and dry and develop toward the upper leaves. Management points: 7-8 kg of urea per mu, or 20-25 kg of ammonium bicarbonate.
Weak seedlings caused by phosphorus deficiency in soil. The root development is poor, the secondary roots are few and weak, the leaf color is dark green, the leaf tip and leaf sheath are purple, the plants are thin and the tillers are reduced. Management points: Use 20-30 kg of superphosphate per acre. The earlier the effect, the better.
Weak seedlings caused by soil drought. Most of them occur in wheat fields with insufficient soil moisture or run through the wind. They are characterized by slow birth, grayish-green leaves, short and short leaves, slow growth or stagnation (the masses call it "mind-mining"), and the middle and lower leaves gradually change. Yellow dry, small and fine roots. Management points: Combine irrigation with 15 kg of ammonium bicarbonate per acre.
Weak seedlings caused by excessive soil moisture. The leaf color is pale purple and the childbirth is born slowly. In severe cases, the tip of the leaf turns white and dry. Management points: The first timely and deep cultivating ventilation, followed by a small amount of quick-acting fertilizer to promote early-onset seedlings.
Weak seedlings caused by excessive sowing. The seedlings are overcrowded and the plants are thin and slender. Management points: First, pay close attention to sparse seedlings, especially the “headings†in the fields, fields, and fields. Early sparse, sparsely populated, and then apply a small amount of nitrogen and phosphorus fast-acting fertilizers to make up for the excessive consumption of soil nutrients and promote the development of wheat. Weak turn strong.
Weak seeding caused by shallow sowing. Because the tiller node is too close to the surface, the condition of water nutrient is poor, so that the growth of the root system and the development of the axillary buds are inhibited. Therefore, the roots and tendons are usually reduced, and the plants are weak in yellow and are easily dies of freezing. Management points: application of organic fertilizer, appropriate cover grass, soil swaying the roots; plant parts of the ground to stop the growth of smashed cover soil.
Weeds caused by sowing late. Due to the short growing period before winter and the lack of accumulated temperature, the growth of wheat seedlings is thin and the number of tillers is small. Management points: mainly fertilizer supplementation, applying 15-20 kg of ammonium bicarbonate in three-leaf stage; poor wheat field with poor soil moisture and water seepage; timely pouring of drowning water after the three-leaf stage (however, suitable moisture content or poor soil moisture and poor water permeability Block, should not be watered before the winter), the last time before the freezing plan, should pay attention to the soil to the roots, in order to protect the seedlings safe winter.
Safety Box,Home Safe,Large Safe Box,Exclusive Safes
Hebei Yingbo Safe Boxes Co.,Ltd , https://www.yingbosafebox.com