What should urea pay attention to when spraying foliar fertilizer?

What should urea pay attention to when spraying foliar fertilizer? What is the general concentration of urea foliar spray? Urea is the most commonly used nitrogen fertilizer, and urea can also be used as a topdressing outside the root, the effect is better than other nitrogen fertilizers. Therefore, the planting network has sorted out the matters needing attention and the usual concentration of urea used as foliar spraying. The following are listed in detail for netizens 'reference. Note 1, foliar spraying urea do not spray in hot weather or before rain, so as not to burn seedlings or lose fertilizer. The best spraying time of urea is early morning or afternoon every day, and it is best to spray it again at an interval of 7-10 days. Note 2: When spraying cereal crops or crops with smooth leaves, 0.1% adhesive (such as washing powder, washing) can be added. In case it doesn't work. Note 3, generally used for spraying urea, biuret content can not be higher than 0.5%, high content as topdressing easy to damage leaves. Note 4, because the crop type is different, so the concentration of urea solution spraying is also different, such as general cereal crops require spraying concentration of 1.5-2%, such as spraying at flowering, urea concentration is lower. Leafy vegetables and cucumbers were sprayed at concentrations of 1-1.5%. Apple, pear, grape and other fruit trees to 0.5% is appropriate. 0.3% for tomato is suitable. The use of ammonium chloride large particles urea is not good