Urea is easy to use and has high fertilizer efficiency. It is a favorite nitrogen fertilizer for farmers. It can be used as a basal fertilizer, topdressing fertilizer, but also as a top-dressing fertilizer. Improper application will not only cause waste of fertilizer, but also cause “fat harm†and harm crops. Therefore, we must pay attention to "eight bogeys" when applying urea.
A bogey and alkaline fertilizer mixed or simultaneous application. Basic fertilizers include grass ash, lime, calcium magnesium phosphate fertilizer, steel slag phosphate fertilizer. If mixed urea is applied or applied at the same time, the nitrogen in urea will become ammonia and volatilize. Therefore, in summer and autumn, urea and alkaline fertilizer should be staggered for 3-4 days, and winter and spring should be staggered for 7-8 days.
Second taboo for fertilizer. Urea as a seed fertilizer, due to the toxic effects of concentrated biuret, so that the seeds lose their germination power and endanger the seedlings. At the same time, because high-concentration urea can damage the protein structure of seeds and have toxic and inhibitory effects on seeds, it is not suitable for seed fertilizers. If it must be applied as a seed fertilizer, avoid seed and fertilizer contact and control the amount.
Three bogey water immediately after application. Ammonium nitrogen has very low adsorption capacity with soil colloids, and its fluidity and leaching loss in soil is not less than that of nitrate nitrogen fertilizers. In view of these properties of urea, after topdressing urea, do not water it before it is converted, otherwise it will be a waste of waste. Generally summer and autumn should be watered 2-3 days after application, winter and spring should be watered after 7-8 days. Rice topdressing urea should also control the shallow water layer or flower water, cultivating after application, so that the soil, fertilizer blend, can not use urea before heavy rain.
Four bogey shallow Shi. The shallow urea nutrient is volatile and is easily consumed by weeds. Deep application of urea, melting of fertilizer in soil, fertilizer in a moist soil, is conducive to the exertion of fertilizer efficiency. As topdressing points should be applied next to seedlings or in the ditch side of the seedlings, the depth should be about 10-15 cm. In this way, most of the urea can concentrate on the root-dense layer by moving, which facilitates crop absorption and utilization.
5. Avoid excessive usage. The nitrogen content of urea is 44-48%, the nutrient content is high, and the application amount should not be too large, so as to avoid unnecessary waste and “fattageâ€. In general, 5-15 kg per acre of dry land, the application amount per acre of paddy field 15- 20 kg.
Six bogey high concentration foliar spray. Foliar spray should not be too concentrated urea solution, otherwise it will burn the leaves, but also poison plants. Usually, the concentration of corn, wheat, rice and cotton is 2%; vegetables and fruits are 0.5-1%; 0.5-1.5% of fruit trees are suitable.
Seven bogey applications too late. The application of urea too late is not conducive to the exertion of the fertilizer effect, and can easily cause the crop to contain late-maturing, so it should generally be applied 4-7 days earlier than other nitrogen fertilizers.
Eight bogey single application. Urea should be applied in combination with organic fertilizers, phosphorus, and potassium fertilizers to meet the needs of various crop nutrients. If urea is mixed with superphosphate, the unstable ammonium bisulfate can be converted into stable ammonium phosphate, which can accelerate the conversion and decomposition of urea, so that the available nitrogen can be quickly absorbed by the crop and increase the utilization of urea.
A bogey and alkaline fertilizer mixed or simultaneous application. Basic fertilizers include grass ash, lime, calcium magnesium phosphate fertilizer, steel slag phosphate fertilizer. If mixed urea is applied or applied at the same time, the nitrogen in urea will become ammonia and volatilize. Therefore, in summer and autumn, urea and alkaline fertilizer should be staggered for 3-4 days, and winter and spring should be staggered for 7-8 days.
Second taboo for fertilizer. Urea as a seed fertilizer, due to the toxic effects of concentrated biuret, so that the seeds lose their germination power and endanger the seedlings. At the same time, because high-concentration urea can damage the protein structure of seeds and have toxic and inhibitory effects on seeds, it is not suitable for seed fertilizers. If it must be applied as a seed fertilizer, avoid seed and fertilizer contact and control the amount.
Three bogey water immediately after application. Ammonium nitrogen has very low adsorption capacity with soil colloids, and its fluidity and leaching loss in soil is not less than that of nitrate nitrogen fertilizers. In view of these properties of urea, after topdressing urea, do not water it before it is converted, otherwise it will be a waste of waste. Generally summer and autumn should be watered 2-3 days after application, winter and spring should be watered after 7-8 days. Rice topdressing urea should also control the shallow water layer or flower water, cultivating after application, so that the soil, fertilizer blend, can not use urea before heavy rain.
Four bogey shallow Shi. The shallow urea nutrient is volatile and is easily consumed by weeds. Deep application of urea, melting of fertilizer in soil, fertilizer in a moist soil, is conducive to the exertion of fertilizer efficiency. As topdressing points should be applied next to seedlings or in the ditch side of the seedlings, the depth should be about 10-15 cm. In this way, most of the urea can concentrate on the root-dense layer by moving, which facilitates crop absorption and utilization.
5. Avoid excessive usage. The nitrogen content of urea is 44-48%, the nutrient content is high, and the application amount should not be too large, so as to avoid unnecessary waste and “fattageâ€. In general, 5-15 kg per acre of dry land, the application amount per acre of paddy field 15- 20 kg.
Six bogey high concentration foliar spray. Foliar spray should not be too concentrated urea solution, otherwise it will burn the leaves, but also poison plants. Usually, the concentration of corn, wheat, rice and cotton is 2%; vegetables and fruits are 0.5-1%; 0.5-1.5% of fruit trees are suitable.
Seven bogey applications too late. The application of urea too late is not conducive to the exertion of the fertilizer effect, and can easily cause the crop to contain late-maturing, so it should generally be applied 4-7 days earlier than other nitrogen fertilizers.
Eight bogey single application. Urea should be applied in combination with organic fertilizers, phosphorus, and potassium fertilizers to meet the needs of various crop nutrients. If urea is mixed with superphosphate, the unstable ammonium bisulfate can be converted into stable ammonium phosphate, which can accelerate the conversion and decomposition of urea, so that the available nitrogen can be quickly absorbed by the crop and increase the utilization of urea.
Black Light
Black Light lamps called BL light in short.
A black light is an Ultraviolet Lamp. It is called a 'black' light because the ultraviolet light is outside of the visible spectrum. When you shine a black light on some objects, they glow very brightly because they are fluorescent or phosphorescent.
The Black Light UV Lamps effciently emit ultraviolet rays at 315nm-400n,the peak 352nm.
Application:used for trapping insects,luring lamps.
We haveT5, T8,T9,T10,T12 ,and can do4w/6w/8w 10w/15w/30w/36w
And PL blacklight lamp , 10w/13w/18w/26w/,also 2U/3U /spiral blacklight lamp.
Black Light
Black Light, UV Black Light Lamps, Portable Black Lights, Black Light Tubes
Ningbo Sunfine UV lighting Co.,ltd. , http://www.uvlightings.com