Shouguang City, Sun Jiaji street vegetable farmer Zhang Changchun planted this spring, the cucumber has been growing poorly, but also appeared smaller leaves and yellow veins between the phenomenon, showing a serious lack of zinc and other nutrients. This made Master Zhang feel puzzled. When planting spring cucumbers, a sufficient amount of zinc fertilizer and other trace element fertilizers have been used in the soil. Why did cucumbers show a deficiency in their growth? After he arrived at the Shouguang Soil and Fertilizer Testing and Research Center to check the soil, it was discovered that the symptoms of zinc deficiency and other symptoms of cucumber were caused by excessive phosphorus content in the soil, resulting in poor absorption of zinc, iron, and other trace elements by the vegetable roots. However, when the soil was tested in summer last year, the phosphorus content in the soil was 106.23 mg/kg, which was within the required soil content. Why, after one year of soil fertilization, the phosphorus content would reach 319.6 mg/kg, much more than the available phosphorus required for the soil? What about content?
It is understood that before the planting of cucumber, Master Zhang had already used a sufficient amount of phosphate fertilizer in the basal fertilizer, but Master Zhang considered that the phosphate fertilizer was easily fixed by the soil and had a low utilization rate. Therefore, in the process of cucumber growth, a large amount of fertilizer was applied. Phosphorus-containing water-soluble fertilizers to ensure the growth of cucumbers on the demand for phosphate fertilizers. However, phosphate fertilizers in fertilizers are not easily absorbed by vegetables during flushing. As a result, large amounts of phosphorus are accumulated in the soil, leading to excessive phosphorus levels in Zhang’s greenhouse soil.
Sr. Wang Lun of Shouguang Soil and Fertilizer Testing and Research Center said that soluble chemical fertilizers will be associated with iron, aluminum oxides, and layered aluminosilicates, calcium carbonate and calcium, iron, aluminum, etc. in the soil after being applied to the soil. Precipitation reaction or adsorption reaction occurs, which results in greatly reduced utilization of phosphorus. Therefore, it is required to apply phosphate fertilizer together with organic fertilizer in one application at the time of application of basal fertilizer. This can reduce the contact area between phosphate fertilizer and soil, thereby increasing the utilization rate of phosphate fertilizer. However, when phosphate fertilizers are applied, most of the phosphate fertilizers are absorbed by the soil during the process of seepage with the water, which results in the low utilization rate of phosphate fertilizers, resulting in large accumulation of phosphate fertilizers in the soil.
In response to Zhang Shifu’s application of fertilizers with high phosphorus content, resulting in persistent increase of phosphorus in the greenhouse soil, it is recommended that he can reduce the use of phosphate fertilizer from about 150 kg per mu to 60- 80 kg can be used, and fertilizers with low or no phosphorus content should be applied to grow vegetables to prevent phosphorus fertilizers from accumulating in the soil. If Master Zhang is worried that the phosphate in the soil can not meet the demand for vegetable growth, the pH in the soil can be adjusted to between 6.5-7.0 by applying a small amount of lime to reduce the fixation of the soil to the phosphate fertilizer and increase the use of phosphate fertilizer. Rate, to meet the demand of phosphorus for cucumber growth, so that the effective phosphorus content in the soil as soon as possible to reduce the 80-120mg/kg range of the appropriate vegetable growth.
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