In our daily orchard planting, not only to apply a good base fertilizer, but also to carry out real-time topdressing according to the actual situation of the orchard, potassium dihydrogen phosphate and calcium sugar alcohol are the two most common fertilizers we use when topdressing on the foliar surface. Because the use period of these two fertilizers is very close, in order to reduce the cost of spraying, there are often fruit farmers who privately believe that we can not mix potassium dihydrogen phosphate and calcium sugar alcohol. On this issue, in fact, it was discussed earlier. Some people say that potassium dihydrogen phosphate and medium trace element fertilizer mixing is easy to produce precipitation; others say that calcium, potassium elements have a theoretical antagonistic effect, the mixing of the two will affect the absorption, reduce fertilizer efficiency; of course, some people say that they have been mixed in the actual planting, not only no problem effect is particularly good.......
In order to provide a reference for the majority of fruit farmers and friends in fertilization, Xiao Ai made a special experiment to mix potassium dihydrogen phosphate water-soluble fertilizer with sugar alcohol calcium water-soluble fertilizer to verify whether the mixture of potassium dihydrogen phosphate and calcium sugar alcohol will react to each other to produce precipitation. As the old rule goes, before the test starts, let's review what these two fertilizers are and what they do!
Potassium dihydrogen phosphate must be very familiar to everyone, whether it is in the nutritional growth period or reproductive growth period of crops, the flower bud differentiation period of crops or the expansion stage of fruit, almost every growth stage needs to use it! First of all, potassium dihydrogen phosphate is rich in phosphorus and potassium, which can quickly supplement the nutritional needs of crops for phosphorus and potassium. Among them, the phosphorus element contained in potassium dihydrogen phosphate can play a certain role in the differentiation of crop buds, sweetening and coloring, and to a certain extent, it can also enhance the stress resistance of crops and promote the early maturation and yield of crops. Potassium mainly promotes the photosynthesis of crops to enhance the transformation, absorption and utilization of nutrients in the body, while potassium can also improve the absorption and utilization rate of nitrogen fertilizers by crops to a certain extent.
Source: Detailed agricultural technology (symptoms of potassium deficiency in crops)
In addition, potassium dihydrogen phosphate can not only be used as a foliar fertilizer, but can also be used directly with irrigation. If foliar spraying is used, it is recommended to determine the spray concentration range between 0.2% and 0.5% according to different crops, different varieties and different growth conditions, that is, 2 to 5 g of potassium dihydrogen phosphate is added to 2 kg of water. If it is applied in the form of flushing, 4 to 8 kg of potassium dihydrogen phosphate can be applied per mu each time.
In the past, when calcium supplementation was mentioned, many fruit farmer friends hung on their lips to "spray a sugar alcohol calcium once or twice on the line", although it seems that this is far from enough now, but it is not difficult to see from the side that the sugar alcohol calcium as the first choice for calcium supplementation is still very heavy in the hearts of fruit farmers and friends. Sugar alcohol calcium, as the name suggests, is the mixture of sugar alcohol substances and calcium element fertilizer, the main raw materials of sugar alcohol include xylitol, lactitol, sorbitol, mannitol, maltitol, erythritol, calcium raw materials are from calcium nitrate, ammonium nitrate calcium, calcium chloride and so on. Among them, the role of calcium element is reflected in three aspects, one is that calcium element can perceive foreign factors in advance and make defense preparations for adverse environments in time; second, calcium element can increase the hardness of the fruit and the gloss of the fruit surface, which is not only conducive to the storage and transportation of the fruit, but also improves the commerciality of the fruit; third, sufficient calcium element can effectively avoid the occurrence of undesirable phenomena such as cracked fruit, coarse peel fruit, and leaf edge scorching. The role of sugar alcohol is reflected in improving the absorption and utilization rate of calcium in crops.
Source: Details on agricultural technology
Sugar alcohol calcium is also commonly administered in two ways, namely foliar spraying and drip irrigation. If foliar spraying is used, it is recommended to dilute sugar alcohol calcium to 1000 to 1500 times and then spray evenly on fruits and leaves. If the drip irrigation method is used, the sugar alcohol calcium can be diluted directly to 500 to 800 times.
After a brief review of these two fertilizers, let's follow Teacher Xiao Ai to see how the experiment is!
In this experiment, Xiao Ai teachers selected the sugar alcohol calcium carefully selected by Fengchuang and the customized potassium dihydrogen phosphate of Dafeng, and the specific content and dosage form can refer to the following table:
In order to ensure the accuracy of the test, Xiao Ai teacher designed 4 test schemes according to the different dilution concentrations of fertilizers:
Treatment 1: potassium dihydrogen phosphate 100 times + sugar alcohol calcium 100 times;
Treatment 2: potassium dihydrogen phosphate 200 times + sugar alcohol calcium 200 times;
Treatment 3: potassium dihydrogen phosphate 400 times + calcium sugar alcohol 400 times;
Treatment 4 (commonly used dose in agricultural production): 600 times of potassium dihydrogen phosphate + 1000 times of calcium sugar alcohol.
1. After diluting potassium dihydrogen phosphate and calcium sugar alcohol to 100 times, we can see from the figure that the mixed liquid is clear in the measuring cup and does not produce precipitation.
2. After diluting potassium dihydrogen phosphate and calcium sugar alcohol to 200 respectively for mixing, it can be found that the mixed liquid is also very clear in the measuring cup, and no precipitate substances are produced.
3. After diluting potassium dihydrogen phosphate and calcium sugar alcohol to 400 times, we can observe that as in the previous two treatments, the mixed liquid in the measuring cup is clear and transparent, and no precipitate substances are produced.
4. Finally, first dilute the potassium dihydrogen phosphate to 600 times, the sugar alcohol calcium dilution to 1000 times, and then the two are mixed, from the figure can be observed, the liquid in the measuring cup is also transparent and clear, without any precipitated substances.
From the previous experimental effects, we observed that potassium dihydrogen phosphate and calcium sugar alcohol were mixed to 100 times, 200 times, 400 times, respectively, without precipitating substances, and there was no flocculent precipitation after potassium dihydrogen phosphate was diluted to 600 times and sugar alcohol calcium diluted to 1000 times. This is enough to show that potassium dihydrogen phosphate and calcium sugar alcohol can be mixed and used under the above 4 dose ratios.
As mentioned earlier, potassium dihydrogen phosphate and calcium sugar alcohol, as our preferred fertilizers for foliar fertilizers in orchard cultivation, have great significance for the nutritional supplement of orchards. Regarding everyone's question about whether the two can be mixed, through this experiment, it is fully proved that there is no problem in mixing under a certain multiple, and it can be used with confidence. But here is a point to remind everyone, there will be some differences in the products of different manufacturers! Teach everyone a little skill, when using other manufacturers' products, refer to this test, first do a small experiment in the measuring cup, determine that there will be no precipitation and then apply it to the field, so that you can ensure that nothing is lost.