What are the precautions for applying biological potassium fertilizer?
How should cotton be supplemented with potassium fertilizer? For supplementing cotton with potassium fertilizer, it is generally best to use coarse fertilizer as a base dressing. At present, returning straw to the field should be strongly advocated. According to surveys, returning about 800 kg per 667 sq m can not only return 4 kg of potassium oxide to the soil, but also convert slowly available potassium in the soil into available potassium. Potassium fertilizer...
What should be noted when applying biological potassium fertilizer?Biological potassium fertilizer is a new type of yield-increasing agent, namely a silicate bacterial agent. It has two dosage forms. One is the peat dosage form, which appears as a black powdery solid, moist and loose, with a water content of about 30%. The other is a liquid dosage form, which appears milky white, turbid, and has a slightly sour smell. According to data, applying 1 kg of biological potassium fertilizer per 667 sq m has a yield-increasing effect equivalent to applying 15 kg of potassium sulfate or 15 kg of potassium chloride or 30 kg of calcium superphosphate per 667 sq m, and it also builds soil fertility and causes no pollution to the soil. However, production practice in some areas over several years has shown that when applying biological potassium fertilizer, attention must be paid to certain environmental conditions and key application techniques must be mastered in order to achieve a good yield-increasing effect.
First, pay attention to soil conditions. Biological potassium fertilizer has a good effect when applied on loamy land rich in organic matter, alkali-hydrolyzable nitrogen and available phosphorus. It should not be applied to overly barren sandy land or soil with poor water- and fertilizer-retention capacity. On potassium-deficient soil with available potassium content less than 100 ppm, the yield-increasing effect is best.
Second, pay attention to water conditions. On irrigated land with irrigation conditions, the yield-increasing effect of applying biological potassium fertilizer is obvious. On dry land without irrigation conditions, the live bacteria in biological potassium fertilizer cannot grow and reproduce normally, and their role in transforming and decomposing soil potassium and phosphorus cannot be brought into normal play, so the effect is not obvious. Experiments have shown that using biological potassium fertilizer on fields with high water and fertilizer levels and high nitrogen and phosphorus can balance the supply of nitrogen, phosphorus and potassium, and the crop yield increase is large.
Third, priority should be given to applying it to multiple-cropping sequences and potassium-loving crops.
Fourth, when storing and using biological potassium fertilizer, it must not be exposed to sunlight. Seed dressing should be carried out indoors or in a shed. Seeds coated with the bacterial agent should be dried in a cool place, not sun-dried. When applying, the seeds should be dressed and sown on the same day.
Fifth, when biological potassium fertilizer is used as a top dressing, it can be mixed with chemical fertilizers such as urea, ammonium nitrate, ammonium sulfate, potassium sulfate and potassium chloride. However, it should be mixed and used immediately, and should not be stored. It must never be mixed with alkaline substances such as plant ash, so as to avoid killing the bacterial cells and affecting fertilizer efficiency.
Sixth, pay attention to early application. This is because after biological potassium fertilizer is applied to the soil, the bacteria need a process from colonization and reproduction to decomposing and releasing potassium and phosphorus from soil minerals. In order to ensure sufficient time to complete this process and to provide potassium and phosphorus nutrients from the crop seedling stage, attention must be paid to early application. According to experiments, applying as a base dressing before land preparation, seed dressing, root dipping and application when transplanting seedlings all have relatively good effects. If used as a top dressing, it should be applied early at the seedling stage; on the contrary, the later it is applied, the worse the effect.
Seventh, apply it nearby, that is, apply the biological potassium fertilizer around the roots, and the closer the better.
Eighth, pay attention to applying it evenly, as only this is conducive to giving full play to the bacterial agent and the crop.
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