Gantry Type H Beam Welding Machine Gantry Type H Beam Welding Machine,H Beam Automatic Welding Machine,H Beam Automatic Welding Production Line,Automatic Seam Welding Machine Zhengzhou Yueda Technology Equipment Co., Ltd. , https://www.yuedawelding.com
I. Zinc deficiency in soil is a common phenomenon in China.
For a long time, due to China's traditional fertilizer, only pay attention to nitrogen, phosphorus, potassium nutrients, ignoring the study and application of trace elements, resulting in the use of fertilizer trace element additives, is still in the exploratory stage. According to statistics, in early spring, low temperatures, high groundwater levels are highly susceptible to zinc deficiency, alkaline soils have low effective zinc content, and the promotion of zinc fertilizers should be emphasized. In addition, excessive application of phosphate fertilizer, nitrogen fertilizer also induces severe zinc deficiency in crops. The application of hybrid varieties and high-yield cultivation techniques requires a greater amount of zinc for crops and more application of zinc fertilizer.
Second, the typical symptoms of zinc deficiency in crops.
Zinc deficiency in crops is a typical trace element deficiency, also known as physiological disease. Its typical symptoms are: chlorosis of leaves, shortening of internodes, clusters, lobule, and dwarfing of plants, which results in retarded growth, stunted foliage, and sparse fruits. For example, the rice leaves are chlorogenic, brown, and atrophied, often referred to as “freezing seedlings, sitting hoeing,†“white seedling disease,†and “reducing seedling disease,†and the corn leaves are chlorotic and have brown spots. "White flower seedlings", lack of grain and alopecia areata; white and green streaks or bands appear on both sides of wheat veins; internodes are short, and heading and flowering are late, and are not neat; when severe zinc deficiency occurs, ears cannot be eared, grains are small; grains of cotton are lost at the seedling stage. Green, curly edges, stem elongation suppressed, internode shortening, plants clustered, growth delay, low yield; vegetable upper leaves chlorosis, yellow, young leaves, etc., in short, zinc-deficient crop plants Dwarf, shortened internodes, clustered, small skin thickness, low yield, poor quality.
Third, comprehensive prevention and control, rational application of zinc.
1, the role of zinc fertilizer. In recent years, through the application of zinc fertilizers, the facts have proved that the application of zinc fertilizer can promote the growth and development of crops, increase the fruit setting rate, enhance the cold resistance and disease resistance of the crops, and increase the output by about 10-30%. Improve the quality of agricultural products. Therefore, zinc fertilizer can be widely used in rice, corn, wheat, potatoes, tobacco, apples and other crops.
2, scientific and rational application of zinc fertilizer. For the zinc-deficient land, the first soil improvement is to promote straw coverage in dry fields to increase soil moisture, reduce the fixing of available zinc and other nutrients, and increase soil available zinc content; The water source should be guaranteed to be drained as much as possible, and semi-dry type cultivation can be adopted for the water source without guarantee. Second, we must increase zinc fertilizers. Agrochemical service personnel may be employed in various places to conduct soil testing and guidance, and targeted zinc fertilizers may be used. Generally, base fertilizers may be used as the main fertilizer, supplemented by topdressing, and may also be sprayed on the foliage. Most paddy fields may be uniformly distributed as base fertilizer or tiller fertilizer. , Effectively increase rice yield.
3, the development direction of zinc fertilizer. From the analysis of the development trend of fertilizers, China’s “zinc†fertilizers are developing in slow-release, special-purpose, standard, and fine-scale development. With the widespread application and application of various “zinc†compound fertilizers, it is bound to trigger crop fertilization. Field "zinc" revolution. At the same time, do a good job of "Zinc" fertilizer application, so that "zinc" fertilizer for China's agriculture and zinc, to help increase agricultural production, farmers income.
Crops must be high-quality and scientifically prosperous
In recent years, due to the incompatibility of fertilization techniques, one-sided pursuit of nitrogen, phosphorus, and potassium nutrients, ignoring the role of trace elements, resulting in incomplete crop nutrients, outstanding zinc deficiency problems, such as rice "reduced seedlings," "freezing seedlings," "sitting The major diseases of corn, such as "flower white leaf disease", apple "lobule disease", peach "cluster leaf disease", citrus "yellow leaf" and other physiological diseases, have become a major problem affecting crop yield increase. One of the limiting factors must be given high priority.