Urea is convenient to use, high fertilizer effect, it is loved by farmers of nitrogen fertilizer. It can be as basic fertilizer, fertilizer, but also for top dressing. If used improperly, not only a waste of fertilizer, but also will cause "fat", harm crops. Therefore, must pay attention to when applying urea "eight cream".
Employ a cream with alkaline fertilizer mix or at the same time. Basic fertilizer including plant ash, lime, calcium magnesium phosphate fertilizer, phosphate fertilizer steel slag, etc. If mix urea or at the same time, will aggravate the urea nitrogen into ammonia volatilization. Therefore, summer and fall, urea and alkaline fertilizer should be applied stagger 3 to 4 days, should be staggered in the winter and spring were 7 to 8 days.
2 avoid seed manure. Urea as seed manure, due to the fact that the toxicity of biuret concentration will lose seed germination, and endanger the seedlings. At the same time, because of the high concentration of urea can destroy the seed of protein structure, also have poison to seed and the inhibitory effect, so it is unfavorable for seed manure. If must be as seed manure application, to avoid contact, fertilizer, and control the consumption.
3 avoid immediately after watering. Amide nitrogen, and the soil colloid, adsorption ability is low between the liquidity and leaching in the soil of sex is not smaller than nitrate nitrogen. In view of the properties of urea, topdressing urea, before its not transformation completed, do not water, or waste. Summer and fall season should be in commonly 2 to 3 days after watering, winter and spring season should be watered in seven to eight days. Rice topdressing urea also should control the presbyopia shallow layer water, row after, make the soil and fertilizer compatibility, cannot be applied urea before the heavy rain.
4 avoid light. Shallow applied urea nutrient volatile, easy to be weeds. Urea, deep melting fertilizer in the soil, the fertilizer in moist soil, is advantageous to the effectiveness of the play. Make a fertilizer should be beside the acupuncture point in seedling or groove in miao, depth should be in 10 to 15 centimeters. So, urea via mobile can mostly concentrated in the root dense layer, to facilitate crop uptake.
5 avoid excessive dosage. Urea nitrogen content of 44% to 48%, high nutrient content, seems shoulds not be too big, lest cause unnecessary waste and "fat", general dry field seems 5 to 15 kg per mu, paddy field seems 15 to 20 kg per acre.
6 avoid high concentrations of spraying on the leaf. Spraying on the leaf of urea solution concentration of avoid by all means is too large, otherwise it will burn out blade, also poison plants. Usually on the concentration of corn, wheat, rice, cotton with 2% advisable. Vegetables, melons and fruits to between 0.5% and 1% more appropriate; It is advisable to fruit trees to between 0.5% and 1.5%.
Seven avoid applying too late. Applied urea fertilizer too late is bad for the play, easy to cause crop variety TanQing, reason should be earlier than other nitrogen commonly 4 to 7 days.
Eight avoid is a single application. Urea with organic fertilizer and phosphate, potash application, to meet the needs of the crop variety of nutrients. Such as urea and calcium superphosphate mixed fertilizer, can make the unstable ammonium hydrogen sulfate into stable ammonium phosphate, can accelerate the transformation and decomposition of urea, make is to nitrogen can be quickly absorbed by crops, improve the utilization rate of urea.
Summer summer, wuhan people love to swim. Yesterday, the wuhan city health development planning commission announced this year result of sampling observation of swimming pool water quality, sampling of 136 nine substandard in the swimming pool.
In July, who in wuhan city planning commission for profit-
making artificial swimming center of the city's swimming pool water quality sampling, of 136 swimming swimming pool of total bacterial count, coliform bacteria, urea, turbidity, free residual chlorine disinfection and foot pool residual chlorine, the inspection qualified by 127. Sampling a total of 432 samples, including swimming pool, 308, 275, qualified rate 89.3%; Immersion disinfection water 124 feet, 124 qualified, the percent of pass is 100%.
"Free residual chlorine is the key to the pool water quality control, the content must be between 0.3 0.5 mg/L." Wuhan city health supervision and the relevant person in charge of the said, on the low side, disinfection effect is poor, easy breeding ground for germs, cause the spread of infectious diseases; On the high side of eyes, oral cavity mucous membrane and respiratory system and skin irritation.
, head of the analysis of residual chlorine concentration does not conform to the standard, may be caused by failing to master standard management on the disinfectant. Water is the main source of urea in the body sweat, but does not rule out a citizen to urinate in the pool, urea overweight may stimulate the swimmer skin mucous membrane. At present, the unqualified swimming pools have been changes.
Health supervision institutions to remind swimmers, swimming'm taking shower before into the pool, wash adhesion in the body of sweat, and after disinfection foot bath again into the pool, can't pee in the swimming pool.
At present, wuhan swimming pools have been incorporated into the scope of quantitative classification management in public places, a-class said credibility is best. People standing by the pool to see the bottom lane line. 4, and 5, show that the water clear, qualified water under normal circumstances should can smell light chloride.
Urea fertilizer manufacturer, Urea supplier, China Ammonium Nitrate factory – Jin Coal Sun Stone
Jin Coal Sun Stone is a group company,also is the largest and professional manufacturer and supplier of Urea fertilizer, Urea and Ammonium Nitrate in China.
Urea fertilizer, Urea, Ammonium Nitrate, China, manufacturer, supplier, Wholesale http://www.qdtys.com/
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