Due to the low temperature in winter, some fertilizers are more suitable for application, while others are not suitable.
It is suitable to apply ammonium carbonate in winter, the temperature is low, and ammonium carbonate is not easy to volatile and decompose, which is conducive to improving fertilizer utilization rate. Ammonium bicarbonate is an ammonium nitrogen fertilizer, which can be directly absorbed and used by crops after being applied to the soil. , Can provide nitrogen nutrition for crops in time. According to tests, the application of ammonium bicarbonate in wheat fields in winter increases the fertilizer efficiency by 1 to 1.5 times in the high temperature season.
Avoid urea Urea belongs to ammonium nitrogen fertilizer. It cannot be directly absorbed and used by crops after being applied to the soil. It needs to be converted into ammonium nitrogen by the urease secreted by urea bacteria in the soil to be absorbed by the root system. The rate of urea conversion depends mainly on soil temperature. If all the urea applied to the soil is converted to ammonium nitrogen, it takes 7 to 10 days at a ground temperature of 10 ° C, 4 to 5 days at 20 ° C, and only 2 to 3 days at 30 ° C. It can be seen that when crops are topdressed in winter or early spring, if urea is applied, it will often affect crop growth because of slow fertilizer effect.
Increased application of phosphorus and zinc fertilizers The absorption of phosphorus and zinc by crops was significantly affected by temperature and light. Low winter temperatures and insufficient sunlight can easily induce phosphorus and zinc deficiency in winter crops. Phosphate and zinc fertilizers should be added appropriately. In addition, phosphorus can enhance the cold resistance of plants, and increasing the application of phosphorus fertilizer is beneficial to the prevention and cure of crop freezing damage.
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The piston is one of the main moving parts of the
engine, is composed of combustion chamber components.
The pressure of the gas
piston through the connecting rod to the crankshaft, realize the change from
heat energy to mechanical energy.
The work condition is very bad, and the
temperature of 1400-1800 DEG C, and pressure
Up to 13MPa above the gas
contact, greatly alternating thermal stress and mechanical stress.
And by the
serious corrosion of gas, and under the condition of boundary lubrication and
cylinder wall friction and strong impact 1 times.
The piston in high
temperature, high pressure, strong corrosive gas contact so that it has enough
strength and hardness,
Heat resistance and good thermal resistance, high
fatigue strength and corrosion resistance. For high speed diesel Engine Piston
also requires light as far as possible.
In order to reduce the inertia
force.
Marine piston large low speed diesel engine of the crosshead is
usually combined.
The heat treatment process by normalizing and annealing,
and iron pearlite are ferrite organization, has good heat resistance.
Piston
alloy quenched and tempered steel has better heat resistance and corrosion
resistance. The skirt with nodular cast iron annealing treatment, with good wear
resistance.
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