Spinning sowing mainly for sowing, can also be drilled. Under high temperature conditions due to slow germination, so early sowing should be soaked seed germination, about 12 hours after soaking the seeds, placed in a refrigerator at 4 °C low temperature for 24 hours, and then at 15 ~ 25 °C under conditions of germination for several days, to be most Sprouting after germination. Per acre sowing rate of about 10 kilograms, after sowing cover shallow soil or pouring manure and cover straw, melon vines, etc., in order to reduce the temperature and keep the soil moist. Sowing does not require germination after the beginning of September, and the seeding rate can be reduced to 5 to 7.5 kg per mu. Field management is mainly fertilizer and water. Basal fertilizer should be applied before sowing, and human feces and urine should generally be applied. Topdressing can be combined with irrigation. Thin human urine should be applied during the seedling hours. After the plants are large and the temperature drops, the concentration can be appropriately increased. Spinach is usually harvested in stages and top dressings after each harvest. Early attention should be paid to timely weeding, and pay attention to the prevention of aphid damage. Harvesting sow spinach leaves more than 15 cm long, when the plants are more crowded, they begin harvesting and harvest every 20 days.
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The valve stem is an important part of the valve.
It is used to drive, connect the actuating mechanism or handle, and directly
drive the spool to move or rotate, so as to realize the function of valve switch
or regulation.Valve stem in the valve opening and closing process is not only
moving parts, stress components, but also seals. At the same time, it is
subjected to the impact and corrosion of the medium, and it also causes friction
with the packing. Therefore, in selecting the stem material, it must be
guaranteed that it has sufficient strength at the prescribed temperature, good
impact toughness, scratch resistance, corrosion resistance. The valve stem is a
vulnerable part, and the mechanical performance and heat treatment performance
of the material should be paid attention to when selecting.The valve stem in the
valve opening and closing process, under tension, compression and torsion force,
and direct contact with the media, as well as the relative motion between the
friction and filler, so in the choice of stem material, must ensure that it
provides adequate temperature strength, good impact toughness, abrasion
resistance and corrosion resistance of.