Rice field nitrogenous fertilizer application method capable of reducing cadmium content of rice grain

A technology of rice grains and application methods, applied in the directions of fertilization methods, applications, fertilization devices, etc., can solve the problems of lack of research, lack of nitrogen fertilizer application methods in paddy fields, etc.

Inactive Publication Date: 2014-01-08
CHANGZHOU UNIV
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Problems solved by technology

However, there is still a lack of research on the impact of nitrogen fertilizer application level and application period on ri

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  • Rice field nitrogenous fertilizer application method capable of reducing cadmium content of rice grain
  • Rice field nitrogenous fertilizer application method capable of reducing cadmium content of rice grain

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Embodiment Construction

[0013] 1, the amount of nitrogen application in the present invention is based on pure N, because the nitrogen content of different fertilizer varieties is different, the specific fertilizer application amount will be calculated according to the nitrogen content of specific fertilizer varieties during fertilization.

[0014] 2. Before fertilizing, fill the paddy field with a thin water layer (about 3 cm), apply fertilizer evenly into the water layer, let the water layer dry naturally before watering, and do not drain before the water layer dries up. When fertilizing, try not to make the fertilizer stick to the rice leaves, so as not to burn the leaves.

[0015] (3) In the selection of rice varieties, it is advisable to choose japonica rice varieties with weak Cd absorption ability in soil, rather than indica rice or hybrid rice varieties with strong Cd absorption ability.

[0016] Table 1 Comparison of grain cadmium content under different nitrogen fertilizer application meth...

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Abstract

The invention specifically discloses a rice field nitrogenous fertilizer application method capable of reducing cadmium content of a rice grain, which belongs to the field of heavy metal pollution prevention and control technology for agricultural products. According to the method, the total nitrogen application rate of a nitrogenous fertilizer applied in a Cd-contaminated rice field is 225 kg/hm<2> in terms of pure N, the nitrogenous fertilizer is applied twice, respectively applied 3 days before transplantation of rice seedlings and 20 days after transplantation of the rice seedlings, and the nitrogen application rate is half of the total nitrogen application rate each time. The method can guarantee no obvious decrease of rice output and greatly reduce cadmium content of the rice grain.

Description

technical field [0001] The invention belongs to the prevention and control technology of heavy metal pollution of agricultural products. Background technique [0002] Since the 1950s, with the substantial increase in population, the rapid development of industries such as mining, smelting and manufacturing, the extensive use of agricultural chemicals and the discharge of urban sewage and sewage, resulting in the harmful effects of Cd, Pb, Hg, Cu, etc. The rapid and excessive accumulation of biologically toxic metal elements in the environment has aroused widespread concern about the environmental pollution caused by human activities. Most of these metal elements are summarized together and are called "heavy metals". " element. Among the various heavy metal elements, cadmium (Cd) is one of the most concerned elements, because Cd is easily absorbed by plants and is often enriched in the human body through the food chain. [0003] Cd is extremely toxic to the human body and i...

Claims

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Application Information

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IPC IPC(8): A01C21/00
Inventor 刘建国黄一澄柴育红
Owner CHANGZHOU UNIV
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