Phosphorus fertilizers are suitable for use as base fertilizers and seed fertilizers and are not suitable for top dressings. Phosphorus absorption capacity is weak during wheat seedlings, and it is particularly sensitive to phosphate fertilizers. The application of phosphate fertilizer has a particularly prominent role.
In recent years, phosphate fertilizers have also failed due to the large amount of phosphate fertilizers applied: they are not effective after application on some fields. But no matter what kind of soil, as long as wheat is sown late, the effect of phosphate fertilizer is very prominent.
In the past we conducted such an experiment: sowing wheat in two phases. The first phase was carried out during the appropriate sowing date of wheat, and the second phase was broadcast half an hour later than the first phase. There were two kinds of nitrogen fertilizer and nitrogen fertilizer plus phosphate fertilizer for each sowing date. As a result, the appropriate time sowing only nitrogen fertilizer, wheat yield 418 kg per mu; applied nitrogen fertilizer and phosphate fertilizer, 502 kg per mu, phosphorus fertilizer production increased by 86 kg; the second period of sowing nitrogen fertilizer, yield 328 kg per mu; nitrogen fertilizer plus Phosphorus fertilizer produced 482 jin per mu and applied phosphorus fertilizer increased 154 jin. The same amount of phosphate fertilizer applied to late sowing wheat almost doubled the yield of sowing wheat. It is worth noting that the difference between sowing dates is half a month, and late-seeding without phosphate fertilizers is weak, resulting in a severe reduction in yield. When phosphate fertilizers are applied, it not only exceeds the yield of wheat without proper application of phosphate fertilizer but also differs from that of previous application of phosphate fertilizer. 20 pounds. The late sowing of returning wheat has reached the same level as that of early sowing. The contents of the other experiment are the same as those of the previous experiment, but the experimental plots have high fertility, yield over 800 kilograms per mu, and are rich in soil phosphorus. In this field, proper sowing, no significant effect of phosphorus; after half a month later, phosphorus production increased 132 kg.
One year due to late corn harvest and rainy weather, wheat was more than 20 days later than the normal sowing date. However, on the basis of the application of nitrogen fertilizer, the re-application of phosphate fertilizer resulted in a large area of â€‹â€‹harvested wheat and a yield of 825 kg per mu. Phosphorus fertilizer, only 517 pounds per mu. This is the result of a demonstration experiment we conducted. The facts of these experiments and field demonstrations led us to the conclusion that late sowing of wheat and application of phosphorus increased production. Adopting this measure can promote the sowing of late crops and high yields of wheat, and can promote the revival of plucked wheat.
One of the reasons for the high efficiency of applying phosphorus to late-seeding wheat is that wheat is sown in the autumn. With the delay of the sowing date, the soil temperature is getting lower and lower. The lowering of soil temperature brings two kinds of unfavorable results: First, there is less and less effective phosphorus in the soil that can be used by crops. The available phosphorus in the soil varies with temperature, and high temperature can stimulate the activity of phosphorus, activate the phosphorus, increase the available phosphorus, and reduce the available phosphorus at low temperature. Due to the reduction of available phosphorus, the soil with sufficient available phosphorus was insufficient at this time. Second, the high temperature, strong wheat root activity, can actively absorb phosphorus; low temperature, weak wheat root activity, it is difficult to effectively use phosphate fertilizer. Another important reason is that phosphate fertilizer plays an important role in promoting the delivery of wheat. An important reason for the late sowing of wheat crops is the low number of births. This chain reaction eventually led to a reduction in wheat production. One of the major achievements of phosphate fertilizer is to increase the number of deliveries. Therefore, the application of phosphate fertilizer in the case of a decrease in soil phosphorus and a weak wheat absorptive capacity will increase the amount of available phosphorus in the soil, ensure the utilization of crops, and make sufficient phosphorus available to the wheat roots that are not active enough to increase the number of tillers.
In addition, to give full play to the role of phosphate fertilizer production, one of the important measures is to deepen. Deep application can apply the fertilizer to the place where the roots of the crop are dense, and the nutrients can be obtained after the rooting of the crop. The application was too shallow. The fertilizer applied to the surface of the soil, and the roots were tied deep into the soil. The roots that absorbed nutrients went against the fertilizers that supplied the nutrients. They did not meet each other and the fertilizers did not work. Deep application is particularly important for phosphate fertilizers because they are difficult to dissolve, they are difficult to move, they are too shallow, the roots of crops continue to grow downwards, and the phosphorus fertilizers are on the surface, playing only part of the role.
Another point to note is that the phosphorus supply level of the soil is the key factor in determining the effect of phosphate fertilizer. Only applying phosphate fertilizer on phosphorus-deficient soil can significantly increase the yield. If the soil is fully supplied with phosphorus, no effect can be achieved. Nitrogen fertilizers and phosphate fertilizers are nutrients that are often lacking in dryland soils. The combined use of these fertilizers will give full play to their roles.
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