First, according to different vegetable types and varieties, growth and development, yield and determination of soil nutrient content, determine the type and amount of fertilization. According to the characteristics of farmyard manure and chemical fertilizer, it is reasonable to use fertilizer. Farmyard manure, long fertilizer effect, with comprehensive nutrients, microbial activity, can loosen and improve soil quality, has a significant effect on improving vegetable yield and improving the quality of vegetables, and should be used as base fertilizer. Chemical fertilizers are quick-acting, short-lived, containing nutrients monotonous and suitable for topdressing. In order to increase the utilization of organic fertilizers and chemical fertilizers and to exert their fertilizer efficiency, the two fertilizers are generally used together. According to the growth and development of vegetables, how much nutrients need to determine the number of top dressings, times and intervals. For example, vegetables with good growth and development, short growing period, less top dressing or no top dressing; vegetables with poor growth and growth, long growing period, should increase the frequency of topdressing and increase fertilizer. Usually chase 1 time every 7 ~ 15d, a total of 3 to 5 times. According to different vegetable varieties and fertilizer types, determine the fertilization method.
1. Apply more organic fertilizer
Organic manure is fully fermented, nutrient-rich, long-lasting fertilizer, conducive to absorption, can be used throughout the growth and development cycle of vegetables, but human fecal urine can also be used as top dressing.
2. Scientific and rational application of chemical fertilizers
According to soil testing to understand the soil nutrient content and the performance of various fertilizers, determine the use of chemical fertilizer varieties, quantity and ratio. Fertilizer as a basal fertilizer is best used in combination with farmyard fertilizers because farmyard manure has the ability to adsorb nutrients from fertilizers and can increase fertilizer efficiency. Fertilizer as top-dressing as much as possible to take a small number of fertilization methods. The nutrient content of chemical fertilizers is high, and the amount should not be too much. Otherwise, the phenomenon of burning seedlings, burning roots, burning seedlings, burning leaves, etc. is prone to occur, and waste is caused at the same time. According to different vegetable types and varieties, determine the application of different fertilizers. Such as leafy vegetables need more nitrogen, can apply more urea, ammonium nitrate, ammonium sulfate, ammonium bicarbonate, ammonia and so on. Fruit and vegetable vegetables require more phosphorus and potassium, which can be applied to more diammonium phosphate, potassium dihydrogen phosphate, calcium superphosphate, potassium chloride and so on. Rhizomes require more phosphorus and potassium fertilizers, potassium chloride, potassium sulfate, potassium dihydrogen phosphate, and multiple compound fertilizers can be applied.
3. Promote leaf dressing with various trace elements
With a variety of trace elements, foliar dressing is simple and convenient, save time and work, nutrients are comprehensive, absorb nutrients fast, and have quick results. A variety of nutrients are used in conjunction with what is lacking, and some fertilizers can be used in combination with neutral pesticides to play a variety of effects of pest control and fertilization.
4. Advocate the combination of deep basal fertilizer
Due to the accumulation of salt in the soil of protected areas, the surface layer of the soil is accumulated, and the topsoil is hardened or hardened. In combination with deep-casting basal fertilizer, the soil fertilizer is fully mixed, the upper and lower soil layers are mixed, and the crushed soil surface is crushed and turned to the lower layer, which can greatly reduce the surface soil compaction and salt damage.
Nucleic Acid Workstations,Pcr Thermal Cycler System,Real Time Pcr Instrument,Nucleic Acid Diagnosis System
Jiangsu Dinai Bioengineering Co.,ltd. , https://www.dinaipcr.com