Potato dwarf does not love growth, leaves shrink and lifeless, early flowering, difficult to seal the ridge, and the flower stems are long, the dead seedlings do not seal the ridge, what to do? The potato plants are small, stiff, the leaves are small, the edges are upturned and the leaves are dark Green, unable to seal the ridge is commonly known as the "small old seedlings", is a typical lack of phosphorus. This phenomenon will seriously affect photosynthesis and will have a greater impact on later production.
The occurrence of such a situation is not the lack of phosphorus in the soil, but the presence of phosphorus in the soil and the absence of phosphorus in the plants. Most farm base fertilizers use 12-18-15, 13-17-15 high phosphate fertilizer or 18-18-18, 15-15-15 balanced fertilizer about 100 kg, usually can fully meet the nutritional needs of potato seedlings. However, due to the El Niño phenomenon, the low temperature during the emergence of the potato, coupled with the drought or low stagnation of some farms, further exacerbated the absorption of phosphorus by the potato.
In addition, the roots are underdeveloped, and the roots are shorter and shorter; while the temperature is up, the phosphorus in the soil is almost inactive and is fixed or leached by the soil. However, most users of the cultivating fertilizers have adopted high-nitrogen, high-potassium and 0-phosphorus fertilizers, which eventually led to further deterioration of such conditions.
According to the relevant data, the utilization rate of phosphate fertilizer in the base fertilizer before the emergence of the potato is negligible, and the appropriate application in the cultivating, the first water in the seedling period begins to focus on the supplement of water-soluble phosphate fertilizer (liquid phosphate fertilizer), the United States and other countries. Especially in the form of polyphosphoric acid liquid fertilizer supplement is very common, it is recommended that farmers change the fertilization method next year.
The main reason for the longer flower stems is caused by sudden dryness and wetness. The potato plants are in a state of water shortage for a long time, and such a situation occurs when water is suddenly supplied or rains during flowering. Too long stems will consume 6-10% of the nutrients of the plant.
Therefore, pay attention to watering, if there is a phenomenon of too long stems, it is necessary to quickly add phosphorus and nitrogen fertilizers to achieve the role of reminder. If the potato after normal ridge closure should use a large amount of phosphate fertilizer during the full bloom period to shorten the flowering period, reduce the waste of nutrients, and increase the nutrient return to the underground tubers.
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