Fertilizing method for reducing cadmium content of leafy vegetables in overproof cadmium vegetable plot

Abstract

The invention discloses a fertilizing method for reducing the cadmium content of leafy vegetables in an overproof cadmium vegetable plot, which comprises the following steps: (1) taking a carbonized rice husk as a base fertilizer, applying before the leafy vegetables are sowed and uniformly raking with soil or embedding the carbonized rice husk into a planting trench before the leafy vegetables are transplanted; and (2) taking an inorganic fertilizer as an additional fertilizer, and spray-applying the inorganic fertilizer rich in nitrogen, phosphorus and potassium taken as the additional fertilizer after the final singling or the survival of the leafy vegetables. In the step (1), 250-750 kg of carbonized rice husk is applied for each mu. In the step (2), the inorganic fertilizer is uniformly divided into 3 or 4 parts and is dissolved into water to be spray-applied, the inorganic fertilizer is sprayed for the first time after the final singling or the survival of the leafy vegetables, is sprayed once every 5-10 days and is totally sprayed for three or four times, and the inorganic fertilizer provides N5-15 kg, P2O51.6-4.0 kg and K2O55.0-15.0 kg for each mu. The fertilizing method has the benefit that as the carbonized rice husk and the inorganic fertilizer are applied together, the safe quality of the leafy vegetables is improved, and the content of Cd in the leafy vegetables is reduced.

Description

technical field [0001] The invention relates to a method for cultivating leafy vegetables, in particular to a fertilization method for reducing cadmium content in leafy vegetables with cadmium exceeding the standard. Background technique [0002] Vegetables are one of the indispensable plant-based agricultural products in people's daily life, and they have very important nutritional value in maintaining normal physiological activities of the human body and improving health. In recent years, due to the unreasonable discharge of industrial "three wastes", the unreasonable use of agricultural chemical inputs with high content of heavy metals, and vehicle exhaust emissions, the environment of vegetable production areas has been damaged to varying degrees, and heavy metals have appeared in a considerable number of vegetable soils. Accumulation, especially the Cd content is significantly higher than the soil background value, exceeding the secondary standard of soil environmental ...

AI Technical Summary

Problems solved by technology

[0005] my country is extremely rich in rice husk resources, about 45 million tons of rice husks are produced every year, some of which are used for power generation, board making, biomass fuel, etc., and a considerable amount of rice husks are not fully utilized and are thrown away as waste. However, it is a great waste of resources and causes great pollution to the environment.