Corn is a crop that requires more fertilizer, especially for summer corn that is intercropped in wheat fields. Â
   Jointing fertilizer is generally in the land with strong fertility and strong plant growth. The amount of topdressing can account for 20%-30% of the total topdressing amount ; the land with poor soil fertility and weak plant growth, 40% of the total amount of topdressing % is appropriate, in order to promote roots and strong stalks, to build a shelf for high yield. Â
   Before the attacking corn fertilizer enters the big bell mouth, the intercropping corn is generally in August . At this time, the corn needs more fertilizer, which is a key period for determining the size of the ear and the grain size, and also the peak period of corn fertilizer. Under moderate soil fertility conditions, 40-50 kg of ammonium sulphate is suitable , accounting for 50%-60% of the total topdressing amount ; soil fertility is high, which can account for 35%-40% of the total topdressing amount , generally increasing production by 15%-20 % . Â
   After attacking and granulating, the seeds are applied before pollination, which can prevent premature aging and promote the large grains of the ear. Do not use too much, controlled within 10% of the total amount of application .
A fitting is any part used in a piping system to change direction or function and joined to that system by some mechanical means or by welding. The simplest way to change the direction of a pipe would be to bend it.However, besides restricting the flow, this method often distorts the shape of the pipe and reduces the wall strength. Another method of altering direction is with mitered joints, I.e. straight piecesof pipe cut for the required turn and welded together. This type lowers flow efficiency considerably by creating greater turbulence. A single mitered bend has about six times the resistance of a smooth elbow. Fittings are preferable for most piping systems where rate of flow, internal pressure and protection against a corrosive environment are primary design considerations
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