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United cadmium reduction method for reducing activity by basal application of passivation material to rice field and dressing zinc fertilizer in tillering stage to enhance antagonism

A technology of tillering stage and basal application, applied in fertilization methods, fertilization devices, inorganic fertilizers, etc., can solve the problems of reduced zinc effectiveness, poor cadmium reduction effect, low zinc effectiveness, etc., achieve low cost, overcome biologically effective The effect of reducing and enhancing the effect

Inactive Publication Date: 2018-03-16
INST OF SOIL SCI CHINESE ACAD OF SCI
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Problems solved by technology

However, under the condition of increasing pH by applying alkaline passivation materials, the availability of zinc in the soil decreases. Even if a small amount of zinc fertilizer is added to the passivation materials, the availability of zinc is very low due to the strong alkalinity of the passivation materials. , resulting in poor cadmium reduction effect

Method used

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  • United cadmium reduction method for reducing activity by basal application of passivation material to rice field and dressing zinc fertilizer in tillering stage to enhance antagonism

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Experimental program
Comparison scheme
Effect test

Embodiment

[0011] Embodiment: (Guixi, Jiangxi, Tongling, Anhui)

[0012] In Jiangxi Guixi paddy fields with pH 4.9, total cadmium 0.75mg / kg, and total zinc 62.4mg / kg, the planting variety is Meixiangxinzhan (Jiangxi Xing’an Seed Industry Co., Ltd.); at pH 5.6, total cadmium 0.62mg / kg , total zinc 87.6mg / kg in Tongling rice field, Anhui Province, the planting variety is Jingliangyouhuazhan (Yuan Longping Agricultural High-tech Co., Ltd.). On the basis of basal application of 200kg / mu of lime, apply 3kg / mu of ZnSO in the early stage of tillering 4 .7H 2 O. After 2 days, the field was kept flooded until the stage of milk maturity, and the rice was harvested after it matured. The test results are shown in Table 1:

[0013] Table 1

[0014]

[0015] Note: Except for the different treatment methods, all the groups in the table have the same conventional cultivation.

[0016] In the above two acidic soils with moderate and mild cadmium exceeding the standard, the cadmium concentration of...

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Abstract

The invention provides a united cadmium reduction method for reducing the activity by basal application of a passivation material to a rice field and dressing zinc fertilizer in a tillering stage to enhance the antagonism. According to the united cadmium reduction method, before rice planting, an alkaline passivation material such as lime is basically applied according to a standard of 100 to 300kg / mu; in the earlier stage of rice tillering, soil is kept in a semihumid state, and the zinc fertilizer 3kg / mu is uniformly applied into the soil; after the fertilizer is applied for 2 d, water is used for irrigation till the milk-ripe stage or a later stage of the rice. The method integrates application of the passivation material to reduce the activity and dressing of the zinc fertilizer to enhance the antagonism of Zn-Cd. For mildly and moderately cadmium overproof acidic soil with relatively low content of Zn, compared with contrast, independent basal application of the lime, independentdressing of the zinc fertilizer and mixed basal application of the lime and the zinc fertilizer, the united cadmium reduction method has the advantage that cadmium concentrations in brown rice are respectively reduced by 73.8 to 74.6 percent, 52.6 to 54.3 percent, 65.2 to 65.4 percent and 44.8 to 45.5 percent.

Description

technical field [0001] The invention relates to the technical field of safe production of moderately and lightly polluted farmland, in particular to the safe production technology of rice in moderately and lightly polluted farmland with cadmium. Background technique [0002] Cadmium pollution in farmland directly threatens the quality and safety of agricultural products in my country and the sustainable development of agriculture, such as the cadmium rice incident in Guangdong, Hunan and other places. In view of the characteristics of low cadmium pollution, large area and agricultural use of farmland in my country, it is urgent to develop efficient, economical, fast, simple, reproducible and easy-to-promote safe farmland utilization technologies. At present, there are many studies on the treatment and safe utilization of cadmium-contaminated soil, including breeding of low-accumulation varieties of cadmium, development and application of passivation materials, adjustment of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01C21/00C05D3/02C05D9/02C05D11/00
CPCA01C21/005A01G22/22A01B79/02
Inventor 王兴祥黄高翔丁昌峰周志高李孝刚徐昌旭
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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