A floor drain is a plumbing fixture that is installed in the floor of a structure, mainly designed to remove any standing water near it. They are usually round, but can also be square or rectangular. They usually range from 2 to 12 inches (5.1 to 30.5 cm); most are 4 inches (10 cm) in diameter. They have gratings that are made of metal or plastic. The floor around the drain is also sloped to allow the water to flow to the drain. Many residential basements have one or more floor drains, usually near a water heater or washer/dryer. Floor drains can also be found in commercial basements, restrooms, kitchens, refrigerator areas, locker/shower rooms, laundry facilities, and near swimming pools, among other places.
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Urea is used as a top dressing, which is better than other nitrogen fertilizers. However, we must pay attention to the following problems when spraying: First, do not spray in hot weather or before rain, so as not to burn seedlings or lose fat. The spraying time is preferably carried out every morning or afternoon, and sprayed again after spraying for 7-10 days. 2. When spraying cereal crops or crops with smooth foliage, add 0.1% of adhesive (such as washing powder, washing and cleaning). Otherwise, the effect is not good. Third, the urea used for spraying, the content of biuret can not be higher than 0.5%, high content for top dressing is easy to damage the leaves. Fourth, different crop types, the concentration of urea solution required to spray is also different, generally cereal crops require a spray concentration of 1.5-2%, when spraying at the flowering stage, the concentration is lower. The spraying concentration of vegetables and cucumbers of leafy vegetables is 1-1.5%. Apples, pears, grapes and other fruit trees are preferably 0.5%. Tomato is preferably 0.3%.
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