Notice on Issues Concerning the Implementation of National Grain Quality Standards in Grain Acquisition

Quality Inspection Office Memorandum (2006) No. 51

The provinces, autonomous regions, municipalities directly under the Central Government, cities under separate planning and the Grain Production Bureau of Xinjiang Production and Construction Corps, and China National Grain Reserves Corporation:

In order to comply with the implementation of the National Minimum Food Purchase Price Plan and improve the consistency and accuracy of the results of grain purchase inspections, we hereby notify you of the issues that should be noticed in the implementation of national standards for the implementation of wheat and rice acquisition inspections as follows:

I. Problems that should be noticed in wheat acquisition

1. Determination of wheat grain quality

The grain quality of wheat is determined according to the national standard (GB/T 5493) of "Grain and Oil Inspection Type and Intermixing Test". During the test, the wheat grain should be cut transversely to ensure a smooth and neat section. The glass-like transparent body (including translucent body) in the grain is regarded as a hard part; the hard part that accounts for more than 1/2 of the grain is judged as an angular plasmid ( Also called hard plasmid); the ratio of 100 kernels of wheat midhorn plasmid is the keratinocyte rate. The "Wheat" national standard (GB 1351-1999) states that durum wheat with a keratinocyte rate of more than 70% is hard wheat.

2. Black wheat germ test

The "Wheat" national standard (GB 1351-1999) stipulates that black embryos belong to diseased granules. Diseased granules are granules with lesions on the grain surface, which damage the embryo or endosperm. When testing whether the wheat is a black embryo, it should be cut from the middle of the stain to observe whether it hurts the embryo or endosperm; the dark brown or black lesions on the grain surface but not the embryo or the endosperm should not be judged as black embryos. grain.

3. Determination of wheat sprouts test

"Wheat" national standard (GB1351-1999) states that the buds or young root breaks through the seed coat not exceeding the length of the particle, and the bud or young root does not break through the germinating particles of the seed coat. The germinating granules are characterized by that the embryonic seed coat has been broken or bulged and separated from the embryo.

II. Matters Needing Attention in the Acquisition of Rice Quality

Appendix A of the “Rice” National Standard (GB 1350-1999) There is no clear requirement for the moisture content of rice samples in the inspection method for whole milled rice. In the actual test, the high or low moisture content of rice has a great influence on the test results of whole polished rice rate. In order to standardize the inspection method for the whole rice rate of paddy rice, the water content of the sample should be controlled within the range of 14.5% to 12.5% ​​when rice is purchased for the whole millet rate test.

Third, strengthen the implementation of standards management to ensure the smooth progress of pre-plan acquisition

The provinces implementing the minimum purchase price plan should strengthen the publicity of the national food quality standards, conduct quality surveys in a timely manner, grasp the food quality conditions of the current year, and guide the work of grain procurement and quality inspection; adhere to the inspection personnel’s certificated employment system, and adopt training and comparisons. Concentrate inspections and other methods, unified inspection criteria, and improve the consistency of inspection results; each acquisition network should publicize the national food quality standards, make and place physical grade samples, and strictly in accordance with national standards for inspection.

National Grain Administration Standard Quality Management Office June 2nd, 2006