Q: How does the crop absorb nutrients to meet its growth needs?
A: Most of the crops have large roots. The roots can be absorbed by the roots, especially the root hairs on the root tips. Therefore, the roots are the main organs for the crops to absorb nutrients. However, crops can also absorb various nutrients through the leaves, and foliar fertilization is also a way for crops to absorb nutrients.
Q: Why do nitrogen, phosphorus and potassium nutrients emphasize the application of root fertilization, supplemented by foliar fertilization?
A: As far as nitrogen, phosphorus and potassium are concerned, they are three kinds of large nutrient elements that require a large amount of crops. According to the measurement, 500 kg of rice per mu needs to absorb nitrogen (N) 8.5~12.5 kg, phosphorus (P2O5) 4.5~8.5 kg, potassium (K2O) 10.5~16.5 kg, and 305 kg of winter wheat per mu need to be extracted from the soil. The soil absorbs nitrogen (N) 8.4 kg, phosphorus (P2O5) 2.7 kg, potassium (K2O) 5.7 kg; cotton with 216 kg of seed cotton per mu needs to absorb nitrogen (N) 10.3 kg and phosphorus (P2O5) 3.5 kg from the soil. Potassium (K2O) is 16.4 kg. It is impossible to supply such a large amount of nutrients by foliar spraying. However, spraying potassium dihydrogen phosphate solution in the late growth stage of winter wheat can not only supplement phosphorus and potassium nutrients, but also fight against Dry hot air also has a certain effect.
Q: Why do you want to promote foliar application for trace elements?
A: As with the application of nitrogen, phosphorus and potassium macronutrient fertilizers, there are generally two ways to apply trace element fertilizers to crops: soil application of solid micro-fertilizers and foliar application of liquid micro-fertilizers. However, the difference is that because crops require a large amount of nutrients, they should be mainly fertilized by soil and absorbed by a large root system; while crops require less trace elements, and the effect of foliar application is better than soil. The effect of fertilization is good. According to estimates, the total amount of nutrients absorbed by 66.7 kg of lint and its stems and leaves per mu is 10.5 kg, of which only 54.4 g is traced. The total amount of nutrients absorbed by the 3333 kg tomato and its stems and leaves is 35 kg, of which only 91.9 g is traced. With such a small amount of nutrients, foliar application is the best choice.
Q: What are the benefits of foliar application of micro-fertilizer compared to soil application of micro-fertilizer?
Answer: Foliar spray application of micro-fertilizer is more economical, efficient, safe and non-polluting than soil micro-fertilizer. It is much better than soil micro-fertilizer, low cost, large input-output ratio, and economic benefit. Significant and worth promoting.
Q: How should farmers correct the relationship between a large number of elements and trace elements?
A: First of all, we must have a clear understanding. Whether it is a large amount of nitrogen, phosphorus or potassium, or trace elements such as iron, manganese, copper, zinc, boron and molybdenum, although crops have great differences in their needs, they are essential nutrients for the normal growth of crops. Elements, because of their different physiological functions, are equally important and irreplaceable. This is the guiding ideology and basic principle of rational fertilization.
Second, it is necessary to correct the relationship in the process of fertilization. That is to say, only when the soil is not deficient in trace elements, a large number of elements of nitrogen, phosphorus and potassium can fully exert the effect of increasing yield; at the same time, only when the crop needs nitrogen, phosphorus and potassium nutrients, the trace elements can show it. Increased production potential.
Expert tips
â— Crops can absorb nutrients through the roots, but they can also absorb nutrients through the stems and leaves. For a large number of elements, root fertilization should be the main method, and for trace elements, foliar application should be promoted.
â— In the process of fertilization, it is necessary to correct the relationship between a large number of elements and trace elements in order to achieve reasonable fertilization, achieve balanced fertilization, and receive the effects of increasing production, reducing fertilizer, and increasing income.
Author: Lun Chen Shou (China Agricultural University Professor)
Excerpt from: Economic Daily
A: Most of the crops have large roots. The roots can be absorbed by the roots, especially the root hairs on the root tips. Therefore, the roots are the main organs for the crops to absorb nutrients. However, crops can also absorb various nutrients through the leaves, and foliar fertilization is also a way for crops to absorb nutrients.
Q: Why do nitrogen, phosphorus and potassium nutrients emphasize the application of root fertilization, supplemented by foliar fertilization?
A: As far as nitrogen, phosphorus and potassium are concerned, they are three kinds of large nutrient elements that require a large amount of crops. According to the measurement, 500 kg of rice per mu needs to absorb nitrogen (N) 8.5~12.5 kg, phosphorus (P2O5) 4.5~8.5 kg, potassium (K2O) 10.5~16.5 kg, and 305 kg of winter wheat per mu need to be extracted from the soil. The soil absorbs nitrogen (N) 8.4 kg, phosphorus (P2O5) 2.7 kg, potassium (K2O) 5.7 kg; cotton with 216 kg of seed cotton per mu needs to absorb nitrogen (N) 10.3 kg and phosphorus (P2O5) 3.5 kg from the soil. Potassium (K2O) is 16.4 kg. It is impossible to supply such a large amount of nutrients by foliar spraying. However, spraying potassium dihydrogen phosphate solution in the late growth stage of winter wheat can not only supplement phosphorus and potassium nutrients, but also fight against Dry hot air also has a certain effect.
Q: Why do you want to promote foliar application for trace elements?
A: As with the application of nitrogen, phosphorus and potassium macronutrient fertilizers, there are generally two ways to apply trace element fertilizers to crops: soil application of solid micro-fertilizers and foliar application of liquid micro-fertilizers. However, the difference is that because crops require a large amount of nutrients, they should be mainly fertilized by soil and absorbed by a large root system; while crops require less trace elements, and the effect of foliar application is better than soil. The effect of fertilization is good. According to estimates, the total amount of nutrients absorbed by 66.7 kg of lint and its stems and leaves per mu is 10.5 kg, of which only 54.4 g is traced. The total amount of nutrients absorbed by the 3333 kg tomato and its stems and leaves is 35 kg, of which only 91.9 g is traced. With such a small amount of nutrients, foliar application is the best choice.
Q: What are the benefits of foliar application of micro-fertilizer compared to soil application of micro-fertilizer?
Answer: Foliar spray application of micro-fertilizer is more economical, efficient, safe and non-polluting than soil micro-fertilizer. It is much better than soil micro-fertilizer, low cost, large input-output ratio, and economic benefit. Significant and worth promoting.
Q: How should farmers correct the relationship between a large number of elements and trace elements?
A: First of all, we must have a clear understanding. Whether it is a large amount of nitrogen, phosphorus or potassium, or trace elements such as iron, manganese, copper, zinc, boron and molybdenum, although crops have great differences in their needs, they are essential nutrients for the normal growth of crops. Elements, because of their different physiological functions, are equally important and irreplaceable. This is the guiding ideology and basic principle of rational fertilization.
Second, it is necessary to correct the relationship in the process of fertilization. That is to say, only when the soil is not deficient in trace elements, a large number of elements of nitrogen, phosphorus and potassium can fully exert the effect of increasing yield; at the same time, only when the crop needs nitrogen, phosphorus and potassium nutrients, the trace elements can show it. Increased production potential.
Expert tips
â— Crops can absorb nutrients through the roots, but they can also absorb nutrients through the stems and leaves. For a large number of elements, root fertilization should be the main method, and for trace elements, foliar application should be promoted.
â— In the process of fertilization, it is necessary to correct the relationship between a large number of elements and trace elements in order to achieve reasonable fertilization, achieve balanced fertilization, and receive the effects of increasing production, reducing fertilizer, and increasing income.
Author: Lun Chen Shou (China Agricultural University Professor)
Excerpt from: Economic Daily
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