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

A fertilization method and cadmium technology for leafy vegetables are applied in the field of fertilization for reducing the cadmium content of leafy vegetables exceeding the standard in cadmium, and can solve problems such as environmental pollution and resource waste, and achieve the improvement of nutrient imbalance, the restoration of soil ecological functions, and the improvement of soil properties. good effect

Active Publication Date: 2013-04-24
INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A field experiment was carried out in a vegetable field with a total soil Cd content of 0.52 mg / kg. Use 400kg of thin-shelled carbonized rice husks as the base fertilizer for 1 mu, plant two crops of lettuce continuously, and bury them in the planting ditch before the first crop of lettuce seedlings is transplanted. Inorganic fertilizers are used as top dressing, and the amount of fertilizer applied per mu is N12kg, P 2 o 5 4.0kg, K 2 O10kg. The urea (26.1kg) containing N46.0%, containing P 2 o 5 55.2% calcium dihydrogen phosphate (7.3kg) and K 2 O 50% potassium sulfate (20kg) is divided into 4 parts as topdressing per acre, dissolved in water and drenched in batches, drenched for the first time after the lettuce survives, drenched once every 6 days thereafter, and drenched for a total of 4 times. The fertilization of the second crop of lettuce is the same as that of the first crop.

[0034] After using the fertilization method of this embodiment, the yield per...

Embodiment 2

[0036] A field experiment was carried out in a vegetable field with a total soil Cd content of 0.46mg / kg. Use 300kg of powdered carbonized rice husk as the base fertilizer for 1 mu, plant two crops of Chinese cabbage continuously, spread and rake evenly with the soil before sowing the Chinese cabbage. Inorganic fertilizers are used as top dressing, and the amount of fertilizer applied per mu is N8kg, P 2 o 5 3.4kg, K 2 O6.4kg. Calcium nitrate (60.9kg) containing N11%, containing N20%, containing P 2 o 5 52.5% diammonium hydrogen phosphate (6.5kg) and containing K 2 O50% potassium sulfate (12.8kg) is divided into 3 parts as the topdressing of an acre, and it is dissolved in water and drenched in batches. It is drenched for the first time after the cabbage seedlings are established, and then drenched once every 5 days, a total of 3 times drenched. . The fertilization of the second crop of Chinese cabbage is the same as the first crop.

[0037] After using the fertiliza...

Embodiment 3

[0039] A field experiment was carried out in a vegetable field with a total soil Cd content of 0.67 mg / kg. 250 kg of powdered carbonized rice husk was used as a base fertilizer for 1 mu, and the first crop was planted with pakchoi, and the second crop was planted with mustard greens. Rake well with soil. The amount of fertilization per acre of Chinese cabbage is N8kg, P 2 o 5 2.9kg, K 2 O6.0kg, the amount of fertilization per mu of mustard is N10kg, P 2 o 5 2.9kg, K 2 O9kg. Urea (15.0kg) containing N46%, containing N20%, containing P 2 o 5 52.5% diammonium hydrogen phosphate (5.5kg) and containing K 2 O50% potassium sulfate (12kg) is divided into 3 parts as topdressing for one acre, dissolved in water and drenched in batches, drenched for the first time after pakchoi seedlings are established, and drenched once every 6 days thereafter, a total of 3 drenched. After the cabbage is harvested, plow and rake the soil evenly to plant mustard greens. Urea (21.7kg) contai...

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PUM

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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 ...

Claims

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Application Information

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IPC IPC(8): A01C21/00C05F11/00C05G1/00
Inventor 王艳红艾绍英
Owner INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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