Reasonable water management during rice filling and grain filling is an important measure to promote roots and leaves, ensure smooth filling and increase grain weight. Studies have shown that about 30% of the rice to wax ripening stage needs to be synthesized and transferred into the grain. In the later stage of filling, sufficient water supply must be ensured. Generally, the soil water content is 90% of the maximum water holding capacity in the field. Insufficient water will lead to early yellowing of rice leaves and premature senescence of plants, resulting in reduced yield.
Intermittent irrigation should be carried out in the late stage of rice growth, that is, the water is dried and then re-irrigated, and the time of water accumulation in the field is gradually reduced as the rice matures. The last water cut before harvesting should be flexibly controlled according to the specific situation. When the temperature is high during maturity, the water evaporates faster, and the sandy land with higher terrain and convenient irrigation and drainage is suitable for later water cuts. Generally, it is appropriate to cut off water 3 to 5 days before harvesting; the temperature is low during maturity and the soil is sticky. For poorly drained fields, water cuts may be appropriate earlier, and it is generally appropriate to cut off water 10 to 15 days before harvesting.
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Folding knife, a kind of knife, can be folded. The folding knife is mainly connected with a knife body which can be rotated into by a pivot assembly at the front end of the handle. The knife body is provided with a safety buckle relative to the side of the knife body, and an elastic strip relative to the back end of the knife body. The back end of the knife body is provided with a stop part and a stop concave part which can be butted by the elastic strip, and the safety buckle has a tilted elastic buckle part, The elastic strip is arranged in the holding chamber of the handle, one end of which is fixed, and the other end of which is connected with the stop part of the tool body, so as to provide the thrust to assist the rotation of the handle when the tool body is rotated out of the handle, In addition to the simple semi-automatic operation mode of turning out and positioning by using the elastic auxiliary push knife body, the overall thickness of the folding knife is reduced by the refined and simplified structural design, which is convenient for the collection and carrying of the folding knife and makes the operation of the folding knife easier.
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