Factors Influencing Soil Boron Efficiency

In the agricultural production, rape appeared "blooming but not real" symptom, the wheat "no twisting disease", cotton "bud instead of flower", peanut "fruit and not fruitless" It is due to lack of boron.
Factors Influencing Soil Boron Efficiency
1, soil pH (pH value)
Soil pH value between 4.7 and 6.7, the highest availability of boron, water-soluble boron and the PH value is positively correlated. However, between pH 7.1 and 8.1, the effectiveness of boron decreased, and water-soluble boron was negatively correlated with pH. It has been shown that the effectiveness of boron in soil is mainly affected by adsorption and fixation. However, the adsorption and fixation are closely related to the pH value of soil. The availability of boron in acidic soil is the highest, but it is easy to elute the loss. Large amount of lime and boron Adsorption fixed increase, will have induced boron deficiency.
High demand for boron crops, alfalfa soil suitable for growth environment is pH 6.5, lime treatment of soil may be needed. However, lime treatment of the soil as a whole reduces the availability of boron, especially at pH> 7. The reason is that Ca2 + ions inactivate boron ions.
2, soil organic matter
The vast majority of soil available boron exists in the soil organic matter complex (boron and humic acid), organic matter more soil available boron more. Organic matter is decomposed and released into the soil solution because of the boron combined with organic matter or immobilized by organic matter.
Environmental conditions such as cold and humid; heat, dry will reduce the degradation rate of organic matter, will also reduce the amount of available boron in the soil. In addition, there is less organic matter in the soil and less potential for the soil to feed itself, so it is often necessary to apply boron to the soil at a lower concentration.
3, climatic conditions
In the arid area, the fixation effect is enhanced. The higher the temperature is, the less the content of water-soluble boron is and the less effective the soil is. Wet and rainy areas, often due to a strong leaching effect of boron loss, reducing the content of available boron, especially light soil is particularly evident.
4, soil texture
Boron is easily leached in light soils, which results in a decrease of water-soluble boron. In clay soil, due to the adsorption of clay particles, more effective boron is retained. Therefore, under other conditions, light soil Available boron content less than the clay soil, boron deficiency often appear in light soil. However, although the total amount of boron contained in the clay is high, available boron may be low due to the immobilization of boron on the clay surface.
Well seeps, and heavy rainfall or often irrigated sandy soils have strong potential for seepage, making them the most susceptible to boron deficiency, so they require frequent boron supplementation.
5, soil cultivation
In general, when the soil surface is harvested, there is more boron available to the soil and plant roots. Soil cultivation will make the soil mix, improve soil aeration, drainage. These are the best conditions for the decomposition of soil organic matter to release boron.
As crop production practices change to less tillage or no tillage management, the organic matter that accumulates at or near the soil surface will not decompose rapidly, so the soil available boron relies more on soil surface moisture conditions. Therefore, the application of boron fertilizer is very important for crop production.