Wheat freeze injury is one of the disasters in the wheat production in the vast northern wheat region. Especially in the low temperature and drought years, the freezing damage is heavier and the wheat yield is greatly affected. To prevent cold winter wheat damage, in addition to the selection of cold-resistant varieties, there are the following several agricultural measures. Appropriate top dressing. For wheat fields that are underfertilized before sowing, applying fertilizer before winter wheat can consolidate the effective tillering of wheat, increase the sugar content of tiller, and enhance the ability of the plant to resist cold. Nitrogen, phosphorus, and potassium should be mixed after dressing, and the proportion should be appropriate. Special attention should be paid to the application of phosphate fertilizers. Partial application of nitrogenous fertilizers should be avoided so as to avoid causing leggy, making the stem tissue of the plants too soft, and reducing the resistance to cold and lodging. Cover scorpions. Between 300-400 kg of wheat bran and crushed wheat straw are spread per acre between dry wheat rows. This method not only protects the alfalfa and prevents freezing, but also can improve the soil and fertilize the fertility after the covering is corroded. It is an effective measure for wheat to resist drought, prevent freezing, and increase production. In addition, after the winter wheat enters the wintering season, a layer of manure is applied, which is commonly referred to as warm ditch manure, which can protect the wind, protect the earth, increase the temperature and prevent freezing, and supplement the nutrients for the wheat seedlings to grow green. The thickness of manure is preferably 3 to 4 cm. In the case of insufficient manure, late barley fields, shallow-sowing wheat fields, sandy wheat fields, and wheat fields sown with weak springs are given priority. The soil is surrounded by roots. When the wheat seedlings are about to stop growing before wintering, the combination of ramming soil around the root can effectively prevent the wheat from freezing during the winter. In colder, dry and windy years, the antifreeze effect of rammed soil is particularly evident, and it can generally increase production by 5% to 10%. Winter irrigation timely. Straw returned to the field or winter dry year, before the arrival of cold air, a winter irrigation. Wheat timely irrigation in winter has a significant effect of seedling preservation and yield increase. Pay attention to timely cultivating and repression after winter irrigation in order to facilitate conservation. Timely cultivator. Time cultivating can protect droughts and prevent freezing damage. Therefore, it is more important to combine cultivators and winter irrigators in time, especially in clay land. In the late summer wheat fields, wet and dry wheat fields, cultivator, early cultivator, can protect the temperature effect. Timely smoke. After winter, pay close attention to the changes in the weather. Before the cold current arrives, pile up wheat stubble and straw and other smoke in the fields from early evening to early morning to reduce the freezing damage. Spraying hormones. If wheat is prosperous before winter, especially when there are signs of jointing before winter, it should be sprayed with 0.3% to 0.5% of Chlorothorin before the arrival of cold air. After the beginning of spring, we must seize the cracks in the sunny day, control the growth of the ground part of the wheat, or chase the soil miscellaneous fertilizer or mud, in order to protect the wheat's tillering section and young ears. Fetal
Doppler applies ultrasonic doppler principle to obtain the movement
information of fetal heart from abdomen of pregnant women, enlarge the
signals, and output them from earphones so as to calculate the value of
fetal heart rate.
Technical Specification for Yonker YK-90C Fetal Doppler
How to use:
Fetal Doppler Fetal Doppler, Baby Fetal Doppler,Baby Heartbeat Monitor,Doppler Baby Heartbeat Monitor at Home,Fetal Heartbeat Monitor Ningbo Queen Electronic Science Technology Co., Ltd , https://www.queenmeds.com
All in one design
The probe and main units integrated together
High sensitive doppler probe
Crystal clear sound
Low power consumption
Compact and light
Ergonomic design
Easy to use
CE approved
Ultrasound Frequency 2MHz
Sensitivity From 10 - 12 weeks
Before using it for the first time, make sure 2 batteries are in
Press the power button to power on, then adjust the volume
Lie flat with a cushion pillow, keep legs straight and relax
Attach the fetal probe to the abdomen to locate the position of the fetus and find out the best direction to the fetal heart
After hearing regular fetal heart sound, the FHR value will display on the screen in real time