TPR Rubber Coated Measuring Tape Tpr Rubber Coated Measuring Tape,Flexible Tape Measure,Rubber Coated Measuring Tape, Zhongrui Tools Co., Ltd. , https://www.zhongruiglj.com
For soils with slightly alkaline and low organic matter content (the soil pH is generally around 8.0) and effective nitrogen and phosphorus deficiency, acidic compound fertilizers such as monoammonium phosphate or humic acid NPK fertilizers and nitrogen and phosphorus should generally be used. Compound fertilizer is appropriate. However, for a small number of red clay or acid brown loam, alkaline compound fertilizers such as diammonium phosphate should be used.
2. Scientific selection of compound fertilizer based on crop varieties
Generally, the field crops use NPK compound fertilizer, wheat high-yield fields should use NPK ternary compound fertilizer; wheat, rice, millet and other close crops, suitable for powder compound fertilizer; thin planting crops such as corn should use granular Compound fertilizer; vegetables, especially fruit and vegetables, root vegetables and fruit trees, etc. need more cash crops, should use NPK compound fertilizer with higher potassium and low nitrogen.
3. Scientific selection of compound fertilizer according to the nature of fertilizer
National standards stipulate that the effective nutrient content of compound fertilizer (composite fertilizer), the total concentration of high-concentration NPK ≥40%, the low concentration of NPK ≥25%, excluding trace elements and medium elements; water-soluble phosphorus content ≥ 40%, the water molecule content is less than 5%; the particle size is 1 to 4.75 mm. Therefore, in addition to looking at the trademark and nutrient content when purchasing compound fertilizer, it is also necessary to pay attention to the manufacturer and the place of origin. In addition, there are two kinds of potassium in the compound fertilizer, one is potassium chloride and the other is potassium sulfate. Potassium chloride contains chlorine, which is not suitable for chlorine-free crops. Where there is no "S" symbol on the composite fertilizer bag, the potassium is potassium chloride, and the chlorine crops such as grapes, potatoes, tobacco, beets, etc. must not be applied. The fertilizer bag must be marked with the "S" symbol. Compound fertilizer, a compound fertilizer composed of potassium sulfate.
4. Scientific selection of compound fertilizer according to fertilization method
In order to improve the fertilizer efficiency of the compound fertilizer, different application methods should be selected for different dosage forms of compound fertilizer. Granular compound fertilizer must be used as base fertilizer, and the higher the hardness of the pellet, the better the fertilizer. The compound fertilizer composed of ammonium nitrogen in the compound fertilizer is beneficial to increase the utilization rate of nitrogen. For topdressing application, powdered compound fertilizer should be used, and it should be noted that the water-soluble phosphorus content in the compound fertilizer should be greater than 40%, and the nitrogen compound is combined with NH4-N and NO3-N. should. Generally, the effect of humic acid compound fertilizer is better than the effect of topdressing.
Hua County: Yue Xiuli
1. Select compound fertilizer according to soil traits science
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】