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3).Primarily used for hardwoods in new flooring/old floor refinishing applications
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The following are experts' opinions on the science of summer maize in the North China Plain.
1. Fertilization principle (1) According to the results of soil testing and formula fertilization, the total amount of nitrogen fertilizer is controlled and staged.
(2) Efficient application of potassium fertilizer according to soil potassium condition; pay attention to the combined application of trace elements such as zinc.
(3) Advocate the straw to return to the field to fertilize the soil.
(4) Fertilizer deep application of fertilizer combined with high-yield and high-quality cultivation techniques.
2. Fertilization amount and proportion (1) Recommended nitrogen fertilizer in the target yield of 800 kg/mu or more (N) 16-18 kg/mu phosphate fertilizer (P2O5) 6-8 kg/mu potassium fertilizer (K2O) 5-8 kg/ 1 to 2 kg/mu of zinc sulphate; recommended nitrogen fertilizer (N) 14 to 16 kg/mu of phosphate fertilizer (P2O5) 4 to 6 kg/mu of potassium fertilizer (K2O) 4 to 7 kg / mu of zinc sulfate 1 ~ 2 kg / mu; the production level of 400 ~ 600 kg / mu of the field recommended nitrogen fertilizer (N) 12 ~ 14 kg / acre of phosphate fertilizer (P2O5) 3 ~ 5 kg / mu potassium fertilizer (K2O) 0 ~ 5 Kg/mu zinc sulphate 1 kg/mu; field level 400 kg/mu or less recommended nitrogen fertilizer (N) 10 ~ 12 kg / mu phosphate fertilizer (P2O5) 2 ~ 3 kg / mu potassium fertilizer (K2O) 0 ~ 3 kg / mu.
(2) 30% to 50% of the total amount of nitrogen fertilizer for base fertilizer or 50% to 70% of seedling stage as the topping period and the filling stage. When the total nitrogen (N) dosage exceeds 14 kg/mu, the amount of topdressing is twice. At lower times, it is only used as a large-flare period top dressing; phosphorus, potassium fertilizer and zinc fertilizer are all applied as base fertilizer. Fields with more phosphorus applied to the former crops or rich in soil available phosphorus should be used to reduce the amount of phosphate fertilizer.
3. Note that wheat straw is returned to the field. Use the tillage machine to turn the wheat straw into the soil and press it at a depth of 8-10 cm. If it is a two-year ripening area, the rotary tiller can be used to complete the straw tumbling and returning to the summer crop. 
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5) Buffing And Polishing
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The expert group of soil testing and formula fertilization technology of the Ministry of Agriculture based on the characteristics of the main crops in summer, based on the results of the soil testing and formula fertilization project, based on the research and development of the "2011 summer main crop scientific fertilization guidance" to guide local conditions to determine different regions, different crop economy Rational fertilization rate Optimized fertilization period uses scientific fertilization method to improve fertilizer utilization rate.
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