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Crop rotation matching and fertilizing method capable of controlling accumulation of rice heavy metal cadmium

A fertilization method and heavy metal technology, which are applied in fertilization methods, fertilization devices, botanical equipment and methods, etc., can solve the problems of high cost, high price, and large usage amount, and achieve low usage cost, reduced cadmium content, and low price. Effect

Inactive Publication Date: 2013-03-27
CHINA NAT RICE RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of chelated divalent metals is relatively large, and the price is high, resulting in high costs

Method used

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  • Crop rotation matching and fertilizing method capable of controlling accumulation of rice heavy metal cadmium
  • Crop rotation matching and fertilizing method capable of controlling accumulation of rice heavy metal cadmium
  • Crop rotation matching and fertilizing method capable of controlling accumulation of rice heavy metal cadmium

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experiment example 1

[0023] 1. Experimental Design

[0024] 1.1 Experimental matching mode: the matching mode was set to rape-rice, milk vetch-rice, and the idle-rice mode was used for comparison.

[0025] 1.2 Cultivation of previous crop straws with different sulfur contents: sow rape and milk vetch seeds, set 0, 0.01, 0.05 g / kg sulfur treatment (gypsum) after sowing, and harvest rapeseed 15 days before rice transplanting (in full bloom period), milk vetch, sampling and determination of plant sulfur content;

[0026] 1.3 Treatment of straw returning to the field: Soil potting with 9kg of dry soil, Cd content (full amount) of 5.70 mg / kg 10L, and upper diameter of 35 cm. Rapeseed rape and milk vetch according to the same dry weight were respectively turned into the soil as green manure (the turning amount was 0.39 g / kg) and flooded until the rice was transplanted. Each treatment was repeated 3 times.

[0027] 1.4 Rice seedling raising and transplanting: the early rice Zhongzao 22 was used as res...

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Abstract

The invention relates to a crop rotation matching and fertilizing method capable of controlling accumulation of rice heavy metal cadmium and belongs to the technical field of rice planting. The crop rotation matching and fertilizing method provided by the invention comprises the steps of 1) selecting cruciferae or leguminous crop with high sulphur content as a previous crop; 2) applying sulphur base fertilizer with sulphur ratio of 0.25-5.0kg / 666.7m<2> when the previous crop is planted, or spraying 0.05-1.0% of sulphate for at least 1-3 times in a reproductive stage; 3) taking the previous crop as green manure, smashing or directly turning the previous crop into soil to be mixed with the soil 5-15 days before rice transplantation, and carrying out waterflooding on the transplanted rice seedling; and 4) repeating the steps 1)-3) year over year. The previous crop matching mode adopted in the invention roots in the traditional peasant production mode, sulphur fertilizer is also taken as the traditional farming measure, an operation process is simple, price is low, usage cost is low, the crop rotation matching and fertilizing method provided by the invention is universally applicable to heavily, medially and mildly cadmium-polluted rice field and crop production lands in China, and cadmium content in rice can be obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of rice planting, and in particular relates to a stubble collocation and fertilization method for controlling the accumulation of heavy metal cadmium in rice. Background technique [0002] Cadmium, as a toxic heavy metal, has become more and more polluting to crops, and the polluted area of ​​farmland is expanding day by day. Cadmium is a toxic heavy metal with a long half-life and an environmental pollutant. In addition to causing human and animal In addition to acute and chronic poisoning, it also has a strong carcinogenic effect. In recent years, due to industrial "three wastes", sewage irrigation, and large-scale application of pesticides and fertilizers, the pollution of heavy metals in farmland has intensified, and the safety of heavy metals in rice has become increasingly prominent. According to the results of the 2002 and 2003 rice quality and safety surveys conducted by the Rice and Product Quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G1/00A01C21/00
Inventor 邵国胜沈希宏
Owner CHINA NAT RICE RES INST
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