Boron fertilizer in-depth analysis for easy understanding (2)
Source: | Author:goldenvictory | Published time: 2024-03-18 | 457 Views | Share:

Factors affecting soil boron availability

1. Soil pH (pH value)

Soil pH is between 4.7 and 6.7, boron is the most effective, and water-soluble boron is positively correlated with pH. However, between pH 7.1 and 8.1, the effectiveness of boron is reduced, and water-soluble boron is negatively correlated with pH. It has been proved that the effectiveness of boron in soil is mainly affected by adsorption and fixation, and adsorption and fixation are closely related to the pH value of the soil. The effectiveness of boron in acid soil is the highest, but it is easy to be leached and lost. The increase in adsorption and fixation will induce boron deficiency.

The suitable growth environment of alfalfa soil with high boron demand is pH 6.5, therefore, lime treatment of the soil may be needed. But in general, lime treatment of soil will reduce the availability of boron, especially when the pH is greater than 7. The reason is that Ca2+ ions deactivate boron ions.

2. Soil organic matter

Most soils can use boron in the soil organic matter complex (boron and humic acid). Soils with more organic matter have more available boron. Because of boron, which is combined with a mechanism or fixed by organic matter, the organic matter is released into the soil solution after decomposition.

Environmental conditions such as cold and humid; heat and dryness will reduce the degradation rate of organic matter and also reduce the amount of boron available in the soil. In addition, the content of organic matter in the soil is low, and the soil itself is less likely to supply boron. Therefore, it is necessary to frequently apply low concentration of boron to the soil.

3. Climatic conditions

The fixation in arid areas is enhanced, and the higher the temperature, the more severe it is, thereby reducing the content of water-soluble boron and reducing the effectiveness of the soil. In humid and rainy areas, the loss of boron is often caused by strong leaching, and the effective boron content is reduced, especially in light soils.

4. Soil texture

In light soil, boron is easily leached, which reduces water-soluble boron. In clay soil, due to the adsorption of clay particles, more effective boron is maintained. Therefore, under the same conditions, light soil The available boron content is less than that of clay soil, and boron deficiency often occurs in light soil. However, although the total boron content in the clay is relatively high, the available boron may be low due to the immobilized boron on the surface of the clay.

Sandy soils with good water seepage and heavy rainfall or often irrigated have strong seepage potential, making them the most prone to boron deficiency, so they need frequent boron supplementation.

5. Soil cultivation

Generally speaking, when the soil surface is tilled, there will be more boron in the soil for plant roots. Soil tillage will mix the soil and improve the aeration and drainage of the soil. These are the best conditions for the decomposition of soil organic matter to release boron.

As crop production habits change to less farming or no farming management, organic matter accumulated on or near the soil surface will not decompose quickly, so the available boron in the soil depends more on the soil surface moisture conditions. Therefore, the application of boron fertilizer is very important for crop production.