First, choose according to the application method. If it is used for flushing, drip irrigation or foliar spraying, it is recommended to use fertilizers such as potassium humate and ammonium humate, or use humic acid with the smallest molecular weight, the highest activity in humic acid, and can be directly absorbed by plants. Potassium fulvic or ammonium fulvic. If it is used for bottom fertilizer application, it is recommended to choose fertilizers such as ammonium humate or nitroammonium humate. When applying, pay attention to burying in the soil, because ammonium humate is a product of the combination of humic acid and ammonium bicarbonate, which is easy to volatilize. Shi or leaf spray.
Second, choose based on crop type and cost. For field crops, it is recommended to choose humic acid compound (mixed) fertilizer, which is not only easy to apply, but also cost-effective; for vegetables and fruit trees, you can choose humic acid organic fertilizer, humic acid organic-inorganic compound fertilizer, or trace element fertilizer in humic acid. The organic matter in these fertilizers can reach 20% to 45%, which can effectively improve the taste and color of crops. Although humic acid can be used during the whole growth period of the crop, for economic considerations, it can be applied 1 or 2 times at key periods such as after the plant is transplanted, before flowering, the swelling period, and the color change period. The swelling period and color change Combined with spraying effect will be better.
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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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