Borax fertilizer is a kind of fertilizer similar to other microfertilizers, which has the characteristics of regulation and strong applicability. In the case of boron deficiency, boron deficiency, boron deficiency, boron must be used to promote crop growth.

(1) Land conditions

Available boron in soil is an important factor affecting the efficient use of borax fertilizer. The content of available boron in soil is based on the content of water-soluble boron, and the content of soluble boron in soil of 0.5 mg/kg is lower than that of 0.5 mg/kg (which is the critical index of boron application). However, the threshold values of boron deficiency in different soils and crops are respectively 0.2~0.4 mg/kg, 0.2~0.6 mg/kg for cotton, <0.3 mg/kg for fruit trees and <0.1 mg/kg for gramineous crops. General acid soil, light sandy soil, lime soil pH >7, high calcium soil, acid soil, high calcium soil, acid soil, are very easy to appear boron deficiency, therefore, to borax fertilizer as well.

(2) crops suitable for planting

For the crops with high boron content, legumes and cruciferae are the main ones, while the sensitivity to boron is low. However, under the condition of high boron content, borax fertilizer can improve the yield. Rape, cauliflower, celery, grape, radish, cabbage, lettuce, etc. Moderate allergic reaction to tomato, cotton, potato, carrot, peanut, peach, chestnut, tea, etc. Barley, wheat, corn, rice, soybean, broad bean, pea, cucumber, onion, gramineous grass and so on. Boron content of the same crop varies with variety. For example, the effect of boron application on rape is: cabbage > mustard type > cabbage > late ripening > early ripening.

Boron content in leaves is an important index to determine the application effect of borax fertilizer in crops. Under the condition of 20-100 mg/kg, the growth of common crops is basically normal, without the use of borax fertilizer. In some crops (such as rape, cotton), boron deficiency occurs when the boron content of leaves is less than 20 mg/kg, and the application of borax fertilizer is more significant. Therefore, the threshold for boron deficiency is 10 mg/kg. Boron content in leaves greater than 100 mg/kg indicates sufficient boron content, if continued use of borax fertilizer, will cause crop poisoning. The boron content of different varieties, different crop varieties and different growth stages is also different. Citrus and grape leaves show boron deficiency when boron content is less than 10 mg/kg.

In addition, whether boron deficiency is related to the growing environment of crops. If in unconventional weather, such as wet, rainy, drought, water shortage, to crops with a high amount of N, K, calcium fertilizer, will aggravate boron deficiency, therefore, to timely supplement borax fertilizer. By observing the symptoms of boron deficiency in crops, soil analysis and leaf analysis, the nutritional status of borax fertilizer can be judged more accurately.