The water and fertilizer integrated water and fertilizer integration technology integrates irrigation and fertilization, and is embodied in micro-irrigation and fertilization technology. The technology combines soluble solid or liquid fertilizers with soil nutrient characteristics and crop fertilizer requirements, and with irrigation water, by means of pressure (or natural drop), through the piping system and the end dripper or nozzle, the water and nutrients are The way to nourish the soil in the root zone is directly supplied to the crop.
Due to the synchronization of water and fertilizer, proper nutrient content and reasonable ratio, micro-irrigation fertilization has the advantages of high quality, high yield, water saving, fertilizer saving and high efficiency. Under the agricultural conditions of greenhouses and greenhouses, it can also significantly reduce air humidity and make pests and diseases To reduce.
In general, the critical period of crop water demand is mostly in the transitional stage from crop vegetative growth to reproductive growth. It requires less water in the early and late stages, and has strong growth in the medium term and requires more water. The same is true for the absorption of nutrients by crops, such as the booting to heading stage of rice and wheat; the flowering to milky stage of corn; the flowering stage of soybeans and peanuts; the stems and leaves of sweet potato grow to the period of root enlargement; The bell period; the twitching of the beet to the final flowering period is not only a critical period for irrigation, but also a critical period for topdressing. Since crops require water to be basically synchronized in the growth period, the principles of water and fertilizer integration should be implemented for all crops that require irrigation and fertilization.
The water-bearing nitrogen “water-bearing nitrogen†is an advanced method of rice topdressing. It is to spread the fertilizer in the field in the case of the waterless layer in the field, and then slowly irrigate the fertilizer to dissolve and infiltrate the rice roots. Floor. As the water layer dries, the fertilizer slowly penetrates into the root layer with the small water. Compared with the traditional water layer fertilization method, the method not only improves the fertilizer utilization rate, but also promotes the root system, and is also beneficial for preventing lodging and cultivating strong seedlings.
"To take water with nitrogen" technically has to grasp two points: First, pay attention to irrigation and fertilization methods. After the rice seedlings return to green, the surface water is naturally dried by ditching, etc. When there is no water on the surface and crusts or cracks appear on the surface, the required nitrogen fertilizer or special fertilizer is applied to the surface and then watered. When filling the water, you should master the "small water trickle", or let the water immerse into the field from the ditch, and never wash it with big water. The second is to pay attention to the ratio of base fertilizer and topdressing, fertilization amount and fertilization period. To change the tradition of nitrogen base and excessive fertilizer ratio, increase the amount of panicle fertilizer. The ratio of base and chasing of nitrogen fertilizer in double-season early rice is about 1:1. The ratio of top dressing in late-season rice and single-season late rice can be higher. The application rate of nitrogen topdressing can be reduced by about 20% compared with that of water-based topdressing.
The “water-bearing nitrogen†fertilization technology is applicable to various paddy fields, especially well irrigation rice with shallow irrigation and shallow-throwing japonica rice, but it is not suitable for rice that needs water-salt saline.
Regulating plant nutrient orientation to regulate plant nutrient orientation is to promote the absorption of inorganic nutrients, photosynthesis organic nutrients and plant nutrients in the direction of yield and quality formation through rational fertilization and plant body control. Production should be closely combined with rational fertilization and plant management and control, starting from two periods:
Before sowing and before the crop growth. For wheat and rice, it is necessary to control the ineffective tillering through reasonable close planting, proper sowing, balanced fertilization, etc.; for fruit trees, especially fruit trees with easy-falling fruit, it is necessary to properly trim the branches, thinning flowers and thinning fruits, while properly fertilizing. Spraying foliar fertilizers and growth regulators to strengthen new shoots, regulate the number of flowers and fruits, and achieve high-quality and high-yield purposes; for melons and solanaceous vegetables, properly control water and fertilizer, especially nitrogen fertilizer, before sitting in the first fruit. Dosage to prevent falling flowers and leaves due to long stems and leaves.
In the late stage of crop growth, when the root absorption is weakened. It is necessary to save the nutrient loss by means of removing hoes, picking buds, topping, etc., so that the nutrients of the branches and leaves of the crops and the nutrients absorbed by the roots can be concentrated to the roots, grains and other products to improve the yield and quality of the crops. For example, in the corn ear stage, in addition to mites and flower granules, the nutrient consumption can be reduced, the ventilation and light transmission can be enhanced, and the corn yield can be increased. The late stage of the flue-cured tobacco combined with the appropriate application of potassium fertilizer can increase the potassium content of the tobacco leaves and the quality of the flue-cured tobacco; For medicinal crops, measures such as bud extraction and topping should be adopted to improve the root yield and quality of the medicinal materials.
Plant management is not a new technology, but it is covered here. The purpose is to hope that farmers' friends will establish the concept and awareness of active control of plant growth and nutrient, and strive to achieve a bumper harvest of crop yield and quality.
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Corner cube Prism is also named retroreflector or trihedral prism.In the corner cube prism,three reflecting surfaces are perpendicular to each other,like the side wall of the cube.The input surface is perpendicular to the cube diagonal. Disregarding the anlge of the incidence,the output beam is parallel to the input one,but it is of opposite direction. Inset of the several corner prisms, for better matching,their extrance exit surface is often hexagonal.In case of this prism the phenomenon of full internal reflection occurs so it is not necessary,(however it is possible)to put mirror coating on the reflecting faces. Normally the reflection surfaces are AL reflection coating, and then covered with Cu and Black painting.
Pyramid prism/Corner Cube Retroreflector is always used to reflect the beam entering the prism face, regardless of its orientation to the beam. Corner cubes are widely used where precision alignment is difficult.
Corner Cube Prism
Corner Cube Prism,Corner Cubic Prism,Optical Corner Cube Prism,Glass Corner Cube Prism
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