Drought is not good for fertilizer effect
Regarding the basis of scientific fertilization, there is a saying in the farmer's squatting that “seeing the sky, seeing the land, and seeing the cropsâ€. The “seeing the sky†here means that the effect of climate on fertilizer efficiency should be considered when fertilizing. The climatic conditions associated with plant growth include precipitation, temperature and light, which have a significant impact on the efficiency of crop growth and nutrient absorption and the efficiency of conversion of different nutrients. Moisture is one of the necessary living conditions for crops. It can regulate the water, fertilizer, gas and heat state of the soil, affect the effectiveness of fertilizer nutrients and the ability of crops to absorb nutrients from the soil. Drought is not good for the growth and development of crops and the process of nutrient absorption and utilization by crops, so that fertilization does not achieve the desired effect. Therefore, under drought conditions, the total amount of fertilization should be appropriately reduced and used as a base fertilizer at one time.
Reasonable fertilization can "water transfer with fertilizer"
Drought is one of the main adverse factors restricting crop production in China. When drought is encountered in production, it can be combined with irrigation to control the growth and development of crops. The results of the study indicate that the effects of moderate fertilization on promoting crop growth and development under drought conditions are mainly reflected in the following aspects: (1) Improving soil water use efficiency. Under the condition of drought, the appropriate amount of nitrogen fertilizer can improve the soil water efficiency, that is, “water transfer by fertilizerâ€, so that some water that is not effective for plant growth becomes effective, so that the plant can absorb more soil water and relieve it to some extent. Drought damage to crops. 2 promote crop growth. Appropriate application of nitrogen fertilizer under drought conditions can promote crop growth, effectively compensate for adverse effects such as reduced leaf area and slow leaf extension under drought conditions, and promote the accumulation of dry matter. 3 improve the physiological function of the plant. When the crop is subjected to drought stress, the plant needs to mobilize the entire defense system against the lack of water. Appropriate application of potassium fertilizer can effectively reduce the damage degree of water shortage on the cell membrane of plants, thus significantly improving the drought resistance of plants.
It can be seen that when the plants are subjected to drought stress, the physiological functions of the plants can be adjusted by appropriate amount of fertilization, which can indeed alleviate the adverse effects of drought.
Fertilization principles in drought conditions
(1) The amount of one application should not be too large. If the amount of one-time fertilization is large during drought, it is easy to cause the applied fertilizer to be washed away when heavy rain occurs after drought. This will not only cause economic losses to farmers, but also pollute the environment. Therefore, it should be combined with irrigation for fertilization.
(2) Deep application of fertilizer, water and fertilizer. In the case of drought, the fertilizer is volatile if only the fertilizer is applied to the surface. If there is heavy rain after a drought, it is easy to be washed away by the rain. Therefore, the fertilizer should be applied as deep as possible, and the fertilizer should be added after the application to maintain the fertilizer efficiency.
(3) Pay attention to the reasonable mix of fertilizers, especially potassium fertilizer and boron fertilizer. Many studies have shown that potassium ions can regulate the colloidal properties of protoplasts, so that water can smoothly enter cells and strengthen the water-holding capacity of cells; suitable potassium nutrition can also increase root-shoot ratio and enhance crop water absorption capacity; Appropriate potassium nutrition can promote the accumulation of proline and regulate the cytoplasmic swell pressure to enhance the drought resistance of crops. Potassium nutrition can also reduce the loss of water and improve the soil water use efficiency by regulating stomatal movement. In addition, drought is easy to induce boron deficiency in crops, especially peanuts, fruit trees, rapeseed, etc. that are growing. Therefore, under drought conditions, attention should be paid to the appropriate application of potassium and boron fertilizers.
Source: Agricultural Resources Report, No. 12, 2009
Regarding the basis of scientific fertilization, there is a saying in the farmer's squatting that “seeing the sky, seeing the land, and seeing the cropsâ€. The “seeing the sky†here means that the effect of climate on fertilizer efficiency should be considered when fertilizing. The climatic conditions associated with plant growth include precipitation, temperature and light, which have a significant impact on the efficiency of crop growth and nutrient absorption and the efficiency of conversion of different nutrients. Moisture is one of the necessary living conditions for crops. It can regulate the water, fertilizer, gas and heat state of the soil, affect the effectiveness of fertilizer nutrients and the ability of crops to absorb nutrients from the soil. Drought is not good for the growth and development of crops and the process of nutrient absorption and utilization by crops, so that fertilization does not achieve the desired effect. Therefore, under drought conditions, the total amount of fertilization should be appropriately reduced and used as a base fertilizer at one time.
Reasonable fertilization can "water transfer with fertilizer"
Drought is one of the main adverse factors restricting crop production in China. When drought is encountered in production, it can be combined with irrigation to control the growth and development of crops. The results of the study indicate that the effects of moderate fertilization on promoting crop growth and development under drought conditions are mainly reflected in the following aspects: (1) Improving soil water use efficiency. Under the condition of drought, the appropriate amount of nitrogen fertilizer can improve the soil water efficiency, that is, “water transfer by fertilizerâ€, so that some water that is not effective for plant growth becomes effective, so that the plant can absorb more soil water and relieve it to some extent. Drought damage to crops. 2 promote crop growth. Appropriate application of nitrogen fertilizer under drought conditions can promote crop growth, effectively compensate for adverse effects such as reduced leaf area and slow leaf extension under drought conditions, and promote the accumulation of dry matter. 3 improve the physiological function of the plant. When the crop is subjected to drought stress, the plant needs to mobilize the entire defense system against the lack of water. Appropriate application of potassium fertilizer can effectively reduce the damage degree of water shortage on the cell membrane of plants, thus significantly improving the drought resistance of plants.
It can be seen that when the plants are subjected to drought stress, the physiological functions of the plants can be adjusted by appropriate amount of fertilization, which can indeed alleviate the adverse effects of drought.
Fertilization principles in drought conditions
(1) The amount of one application should not be too large. If the amount of one-time fertilization is large during drought, it is easy to cause the applied fertilizer to be washed away when heavy rain occurs after drought. This will not only cause economic losses to farmers, but also pollute the environment. Therefore, it should be combined with irrigation for fertilization.
(2) Deep application of fertilizer, water and fertilizer. In the case of drought, the fertilizer is volatile if only the fertilizer is applied to the surface. If there is heavy rain after a drought, it is easy to be washed away by the rain. Therefore, the fertilizer should be applied as deep as possible, and the fertilizer should be added after the application to maintain the fertilizer efficiency.
(3) Pay attention to the reasonable mix of fertilizers, especially potassium fertilizer and boron fertilizer. Many studies have shown that potassium ions can regulate the colloidal properties of protoplasts, so that water can smoothly enter cells and strengthen the water-holding capacity of cells; suitable potassium nutrition can also increase root-shoot ratio and enhance crop water absorption capacity; Appropriate potassium nutrition can promote the accumulation of proline and regulate the cytoplasmic swell pressure to enhance the drought resistance of crops. Potassium nutrition can also reduce the loss of water and improve the soil water use efficiency by regulating stomatal movement. In addition, drought is easy to induce boron deficiency in crops, especially peanuts, fruit trees, rapeseed, etc. that are growing. Therefore, under drought conditions, attention should be paid to the appropriate application of potassium and boron fertilizers.
Source: Agricultural Resources Report, No. 12, 2009
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