Use moderate temperature and fertilize at the right time
Production practice shows that in the range of 0-32 °C, crop fertilizer absorption function is gradually reduced. For example, the optimum water temperature for rice is 30 °C - 32 °C, the optimum soil temperature for cotton is 28 °C - 30 °C, barley is 18 °C, corn is 25 °C - 30 °C, and tobacco is 22 °C. Therefore, in the hot season, more decomposed organic fertilizer should be applied, and appropriate amount of fertilizer should be applied, and water should be released. In the hot season, attention should also be paid to prevent the "water and fertilizer peaks" from meeting, leading to prolonged crops and early premature aging. In the low temperature season:
1. The semi-fertilized organic fertilizer and the higher concentration of clear water feces can be applied on the wintering crops to provide heat during the decomposition process and increase the ground temperature;
Second, the appropriate amount of phosphorus and potassium fertilizer can be applied to enhance the cold resistance of winter crops;
Use light intensity to improve photosynthetic efficiency
In different ecological areas, the total amount of annual light radiation is different, generally 90-160 kcal, and more than 190 kcal. Agricultural production is to use the light intensity, increase the leaf area coefficient of crops, better absorb and produce nutrients, and improve photosynthetic efficiency. therefore:
First, appropriate nitrogen fertilizer should be applied in places with good light conditions to promote vegetative growth and reproductive growth of crops. Where light conditions are poor, nitrogen fertilizer should be applied less to prevent crops from being late and ripe:
Second, when the light is too strong, apply fertilizer deep to prevent photolysis and volatilization;
Third, in the case of strong light, apply more phosphorus and potassium fertilizer to improve water use efficiency; Fourth, with the increase of leaf area coefficient, appropriate application of fertilizer, but should be applied in the morning and after 4 pm to reduce losses.
1. Features of tape measure
Gift rulers are used for advertising and promotion. They are divided into Steel tape (steel tape) and leather tape (PVC plastic fiber tape). They are usually cute and compact. Tape measures are also called measuring tools. Eighty-five percent of the world's tape measures are exported from China.
2, the characteristics of the tape measure
(1) The tape measure is too deformed and will not fail
Why didn't it fail? The spring in the tape measure is very long, and its range from completely relaxed to fully tightened is very large. The entire stroke of the tape measure includes it, and there is a margin at both ends, so the tape measure will not fail.
(2) Pull one meter long and pull two meters long, there is no difference in tension
The spring of the tape measure is very thin, and the amount of deformation when it is tightened is also small, so the reaction force is very small, and the force change is not felt when the rule is pulled.
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Yucheng tengxu Measuring Tool Co., Ltd , https://www.txhardwaretools.com