Which soils and crops are prone to boron deficiency and how do you apply boron fertilizers?
In southern China, granites with low boron content and other acidic igneous rocks, gneiss, and sandstones are distributed, and because of strong leaching, the area is widely deficient in boron, such as red soil, red soil, brick red soil, yellow soil and purple soil. Wait. In the loess plateau, soils developed from the parent material of the alluvial deposits of the loess and the Yellow River have mostly insoluble boron, and are also characterized by boron deficiency, such as bauxite, cotton soil, and yellow earth. In addition, calcareous soils containing free calcium carbonate are prone to boron deficiency. Excessive application of lime on acid soils will reduce the effectiveness of boron. On the poorly drained meadow soils, the adsorption of boron by organic matter is also prone to boron deficiency.
Fertilizer has different characteristics, and it has different requirements for boron, and the effect of boron fertilizer is not the same. Generally cruciferous, leguminous plants such as rapeseed, soybeans, etc. have higher requirements for boron and have a good response to boron application; various rhizome crops such as sugar beets, potatoes, and fiber crops, fruit trees, etc. have a great demand for boron. ; The wood crops of the elm family require less boron.
Boron fertilizer was applied when the water-soluble boron was less than 0.5 ppm. The total amount of boron needed for crops is not large, and the range of poisoning caused by adequate and excessive amounts is very narrow. Therefore, the amount of boron must be used first and the application should be uniform to avoid causing local poisoning. The application of boron fertilizer to soil is the most commonly used method. The amount of crops requiring more boron is about 0.25-0.5 kg/mu, while the general amount of crop is 0.25 kg/mu (borax); the boron concentration on foliar spray is 0.05 -0.2%, soluble borax can be used, some data show that in the sand leaching strong soil, boron spray and boron fertilizer applied to the effect is similar and superior to the applicator; because boron is easy to poison the seed, Boron seed soaking and seed dressing methods are used only in areas with severe boron deficiency. The optimum application period of boron fertilizer is in the period before crop growth and during the period from vegetative growth to reproductive growth. In order to prevent excessive application of boron or non-uniform boron, boron-containing glass fertilizer or boron-magnesium fertilizer, etc., which have low solubility, may be applied to slow the boron release rate. Boron is generally less effective in the soil and needs to be applied year after year.
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