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Experts: The cold-season turfgrass planted in the northern green space, the grass species belong to gramineous plants, and the nutrient requirements are characterized by nitrogen and potassium fertilizers rather than phosphate fertilizers. In the management of green grass turfgrass, turfgrass should maintain its positional growth for many years. 70% to 80% of the roots of turfgrass are spread in shallow soil of 20 cm depth, and they cannot be ploughed every year except for the application of base fertilizer. Deep application of base fertilizer. You can only topdress during the turf growing season, or spread the fertilizer evenly on the grass roots, or spray fertilizer with the water.
Turfgrass should be pruned frequently. It should be pruned 20 to 25 times a year, especially in summer and autumn. It is trimmed once a year for 7 to 10 days, requiring a large amount of fertilizer. In the fertilization of green grass turfgrass, it is necessary to have a relatively large amount of nitrogen-potassium-phosphorus balanced fertilization, and also to apply the topdressing method, and to supply nutrients gently and continuously.
Q: In order to maintain the beauty of the lawn, how to choose and operate the type and frequency of fertilization?
Experts: In the arrangement of fertilization amount, for the middle and upper green lawn, the total recommended amount for one year: 13-16 kg/mu for net nitrogen; 6-8 kg/mu for net phosphorus; 12 to 13 kg/mu for net potassium; In the choice of fertilizer, when quick-acting elemental fertilizer is used, the phosphate fertilizer is once a year, and the nitrogen and potassium fertilizers are required to be used in small amounts. In the fertilization season from the end of March to the end of October, except for the high-temperature and rainy control from July to August, no or less application is applied. In addition to nitrogen fertilizer, it is usually applied once a month. The annual nitrogen fertilizer is divided into 7 to 8 times, and the potassium fertilizer is applied 4 to 5 times. If compound fertilizer is selected, it is necessary to select a compound fertilizer with a ratio of nutrients to nitrogen and potassium and less phosphorus.
In the form of fertilizer granules, small particles are preferred, and the granules of the fertilizer should not be too large. However, powdered fertilizers are not suitable for application due to sticking to grass blades. A small amount of decomposed organic fertilizer or grass charcoal can also be used as a carrier for granulation.
In recent years, the international market has used high-quality slow-release and controlled-release fertilizers for turf, including micro-soluble organic synthetic nitrogen fertilizer and high-polymer coated granular urea or special coated compound fertilizer, which can reduce the number of fertilization times. And achieve the purpose of continuing to supply nutrients gently.
Q: What problems exist in the current lawn fertilization?
Experts: There are more imbalances in fertilization on turf management. For cold-season turf, it should be fertilized in spring and autumn, and in the summer, it is necessary to control the nitrogen fertilizer. In addition, in the proportion of NPK fertilizer, there is not only excessive nitrogen fertilizer, but also balanced fertilization with NPK, resulting in the appearance of soft yellow leaves and stems. At the same time, there are also improper proportion of compound fertilizers. For example, a large selection of a general-purpose type of 45% (15 to 15 to 15) compound fertilizer has caused a problem of excessive application of phosphate fertilizer.
Source: New Rural Business Daily (No. 25, 2008)
Fertilization characteristics of green grass turfgrass
Q: What is the demand for turfgrass for nutrition? What are the characteristics of management and fertilization?
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