Generally, 5-6 days after planting, the seedlings can be survived. After the lettuce is transplanted, the seedlings can be watered and topdressed. For the lettuce, the seedlings can be used for 1 week, and the water and fertilizer management can be carried out after the seedlings are finished. For every 667 square meters, 10 kg of urea can be chased with water, and the soil should be kept moist. The quick-acting nitrogen fertilizer should be stopped 30 days before harvest to prevent excessive accumulation of nitrate in the leaves. In addition, in the early stage of heart leaf inoculation, the lettuce should also be sprayed with 0.2% potassium dihydrogen phosphate solution.
Upsetting Rebar Coupler, which is different from Rib Peeling Rebar Coupler. The rebar thread is made by upsetting machine, and rebar thread cutting machine. The thread made by chaser.
The advantage of this type of coupler is the thread is bigger than the rebar diameter. So the coupler connection is stable, and the tensile strength can reach standard requirement.
Bridge, tunnel, high speed railway, high tower and other stric construction, this type of upsetting coupler will be need.
The thread is precision, and it does't break the steel material inner structure.
We can manufacture the coupler surface with black or silver color.
Upsetting Rebar Coupler Quick Rebar Coupler Joint,Mechanical Rebar Splicing Coupler,Upsetting Rebar Coupler,Building Material Rebar Coupler BAODING JINDI MACHINERY CO., LTD , https://www.rebarconnector.com
Field management of pollution-free leaf lettuce
Lettuce is not resistant to high temperature and high humidity. When the temperature exceeds 25 °C, it should be ventilated to cool down or take sunshade measures. At the same time, lettuce is also afraid of water, so there is no water in the raft, and it must be drained in time after the rain. After the hot summer rain, the garden must be poured in time.
The stems and leaves of the endive are young and juicy. When working in the field, care should be taken not to damage the stems or roots, otherwise it is susceptible to disease. In the case of high temperature and high soil moisture, when there is no dew on the leaf surface, remove the yellow, old and residual leaves near the ground to prevent disease.
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