Recently, fruit farmers in Huludao and Gansu provinces in Liaoning asked about the need for potassium supplementation in the late growth stage of apples. Therefore, water-soluble high potassium should be applied in early August in late August. However, in the late August, the application of the base fertilizer in autumn will be carried out. Is there any nitrogen fertilizer in the compound fertilizer, and is the potassium fertilizer white? There are many people who have this idea, and they are now answering:
Everyone knows the Red Fuji variety, the temperature difference is above 10 °C to color, the time is in early September, but the potassium is required from late July to early August, the time is advanced to 30 days to 40 days before coloring. This is because the root system has a complex process of absorption, transport to tree synthesis, transformation, utilization, and nutrient redistribution. Only by completing this process before coloring, the tree has more nitrogen and less potassium to synthesize more sugar substances, and it can be colored quickly and colored well at the time of coloring. If you add potassium to the coloring time, it will definitely be late.
The compound fertilizer has a high nitrogen content in the autumn application, which is conducive to improving leaf function, synthesizing more nutrients, and storing it in the tree for flowering fruit and long branches and long leaves next year. Some people worry that the high nitrogen content of the compound fertilizer in autumn will affect the effect of potassium supplementation. In fact, this kind of worry is superfluous, because the compound fertilizer is not like water-soluble fertilizer, and the water-soluble fertilizer only needs to absorb the root pressure and the transpiration of the leaves after the root system absorbs. 6 hours to the various organs of the tree, but the compound fertilizer is applied to the soil, and the roots are cut off for 15 days to 20 days to grow new roots. Moreover, in addition to nitrogen, which is a quick-dissolving fertilizer, phosphorus and potassium are all mineral fertilizers. The compound fertilizer applied to the soil cannot be absorbed by the root immediately. It has a transformation process, and the length of the transformation is determined by the temperature of the soil. The soil temperature is 25 degrees, and the nitrogen takes 4 days to complete the root system absorption; the soil temperature is 15 degrees, and the nitrogen takes 8 days to complete the root system absorption. The lower the soil temperature, the longer the conversion time and the longer the phosphorus and potassium conversion time is than the nitrogen. For slow-release fertilizers such as long-acting fertilizers and multiple-controlled fertilizers, nitrogen can be absorbed in 3 to 4 months. Therefore, the application of nitrogen fertilizer in autumn will not affect potassium supplementation. In September, the compound fertilizer applied to the leaves, the fat is not used up, because as the soil temperature drops, the roots will be slower and slower until the roots are stopped, until the soil temperature reaches 5 °C or more in the next spring, continue to absorb. This season, the nutrition of various fertilizers. Most of the fruit areas of Red Fuji apples are harvested in mid-to-late October, and individual fruit areas are harvested at the end of September and early October. When the fruit is harvested quickly, the fertilizer applied in autumn can be connected, and there is no need to worry about potassium supplementation. Moreover, the base fertilizer is applied early, and the root wound that has been fertilized by the leaves has healed. If the spring application base fertilizer, cut off the absorption root, is not conducive to flowering fruit, long branches and long leaves. Moreover, due to the low temperature at the time, the compound fertilizer also has to grow new roots for dozens of days, transforming, synthesizing and transporting it to the tree. When the new shoots are to stop, the spring fertilizer can be connected to the spring shoots. Stop early and stop early.
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