The characteristics of top dressing are:
1 In the late stage of crop growth, when the ability of roots to absorb nutrients from the soil is weakened or when it is difficult to carry out soil topdressing, the root dressing can replenish plant nutrients in time;
2 external top dressing can avoid the adverse effects of soil on some nutrients (such as some trace elements) after fertilizer application, and timely correct crop deficiency syndrome;
3 When the metabolic process in the body is enhanced during the growth period of the crop, the external top dressing can improve the overall function of the crop. The top dressing can be combined with pest control or chemical weeding, and mixed with medicine and fertilizer, but mixed before it can be mixed, otherwise it will affect fertilizer efficiency or efficacy. The effect of application depends on a variety of environmental factors, particularly the climate, wind speed and the time the solution remains on the foliage. Therefore, the top dressing should be carried out in the clear, windless afternoon or evening.
Shadow carving is one of the design techniques of stone carving. A new handicraft developed on the basis of the early "needle black and white" craft. The earliest works were not created by Hui'an artists in the 1960s. They are all based on photos, so they are called "shadow carving". This kind of carving is made of jade crystal lake bluestone sawn into flat plates. First, the surface is polished. By using its chiseling characteristics, it can show the white spots. With sharp tools, it can carve out micro dots of different sizes, depths, and densities. Only different levels of black and white can be divided, so that the image is displayed. It is not only delicate and lifelike, but also unique. It is the development of stone carving towards pure artistry, opening up a new path for stone carving production.
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