Potassium fertilizer science application technology
Potassium fertilizer should be applied early: usually potassium fertilizer is used as a base fertilizer and a large proportion of fertilizer. If potassium fertilizer is used as top dressing, it should be used early. Because the critical period of potassium nutrition in most crops is in the early stage of crop growth, the potassium uptake of crops is violent in the early and middle stages, and the potassium is significantly reduced in the late stage, even in the mature stage. Cereal crops require a large amount of potassium during the tillering-shifting period, accounting for 60%-70% of the total potassium requirement. Cotton needs the highest amount of potassium in the stage of bud-forming, and the soy-fruit of vegetables is in the flower bud stage, and the radish is the period of maximum potassium demand in the period of succulent root expansion. On sandy soil, potassium fertilizer should not be applied too much at one time, and should be applied in divided doses, that is, the principle of a small number of times should be followed to prevent potassium leaching. On the clay, the base fertilizer can be applied at one time or the amount applied per time is larger.
Potassium fertilizer should be combined with nitrogen and phosphorus fertilizers: Potassium fertilizer efficiency is related to soil nitrogen and phosphorus supply levels. When the content of N and P in soil is low, the effect of single application of potassium fertilizer is not obvious. With the increase of N and P dosage, potassium fertilizer can increase yield, and the interaction of N, P and K can also promote N and P. The absorption of K increases the utilization rate of potassium fertilizer.
Huaxian County Fertilizer Station Zhao Dongli
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The installation is as follows.
1. Installation Steps
a) Choose correct installation site, taking installation area, pipeline, transmitter location &
valve location into consideration;
b) Install the meter according to direction mark on sensor;
c) Install the sensor & transmitter on pipeline;
d) Connect transmitter & sensor with 9-pin cable;
e) Start.
a) Sensor stays away from mechanical vibration source, for example, pump. Use flexible pipe to connect meter with pipeline if inevitable. The housing of meter must be standalone, out of touch with any other device. There must be 3 times the size of sensor between 2 sensors if there are many flow meters on the same pipeline, to avoid resonance.
b) Do not install sensor on pipeline that easily expands with hot and contracts with cold, especially near expansion joint, which leads to a worse stability.
c) Sensor stays away from industrial electromagnetic field, such as large generator and transformer, better 5m at least. Such device influences the performance of drive coil and pickoffs. Make sure magnetic field intensity less than 400A/m.
d) Sensor shall be installed on lower pipeline, to be easily full of fluid.
e) Make sure Ex-mark meet application requirements if in hazardous area.
f) Build a sunshade if the meter is under direct solar radiation. g) Keep the meter from corrosive liquid.
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