According to the United Nations Food and Agriculture Organization, by 2018, approximately 45 million tons of phosphorus fertilizers will be used in the world.
Many people apply fertilizers that have been phosphorus fertilizers over the years.
According to a new study, many people may be unnecessary.
"Phosphorus fertilizer pre-program increases the effectiveness of further use," said Jim Barro, lead author of research. Barrow is a scientist at the Western Australian University.
According to him, he knows better the soil of phosphorus dynamics. This can lead to a more reasonable use of phosphorus fertilizers. "On the world level, phosphorus is a limited resource, we will use it wisely."
At the local level, excessive use of phosphorus fertilizers contaminates water. For farmers, phosphorous fertilizers are expensive for farmers. "If farmers use only as much as it needs, this will help the environment," says barro. "This will save them money."
When the phosphorus fertilizers are used in the soil, only the fraction is obtained by the plants. This is because most of the phosphorus is in soil grains; Only a small part is the solution. "When the part is exaggerated, the plants can be quickly obtained from phosphorous soil," says barrow. "Low fertilizer application rates are enough."
Phosphate, which is used in fertilizers, can react and penetrate soil particles. Barro notes that when this happens, it is "less available to plants, this is the main reason why farmers should use phosphorus fertilizers."
But it's upright. "When the phosphate reaches the soil particles, it is more susceptible to soil particles," explains Barroe. After such allegations repel each other, the negative blame for repelling the soil particles is negatively charged with phosphate. That means there is more solution. Plants get faster, and therefore less fertilizer.
Baroque and colleagues have studied whether phosphate will continue to penetrate the soil particles over time. They believe that this indicator will reduce the negative charge.
They showed that when the phosphorus is used, the phosphate penetration in the course of time will decrease and eventually stop. "When this happens, it's only necessary to change the phosphate used in the previous year (and the product is removed)," says barrow.
Similar is the repair of gravel road. Pomegranates and other flaws must be filled first until smooth, functional upper layer is used.
Baroque worked with his colleagues in West Bengal, India. They used soils in the southwestern corner of the Indian city of Kolelo, 65 kilometers west. To collect phosphoric use over time, researchers used phosphorus and then kept the soil at 140 ° F (60 ° C) per month.
"It's quite slow the usual temperature," says Barro. "In this way we should not wait around for years before we can do the experiment."
Conclusions can help farmers use phosphorus fertilizers more efficiently. The farmers managed to save money. "But these conclusions should be delivered to farmers," says Barro. "The effectiveness of soluble phosphates fertilizers is roughly estimated."
Phosphate rock rock effective fertilizer in Kenya
N. J. Barrow et al, three residual benefits of phosphate fertilization, Soil Science Society America Journal (2018). DOI: 10.2136 / sssaj2018.03.0115