**Quality Inspection Office Memorandum (2006) No. 51**
To the Provinces, Autonomous Regions, Municipalities directly under the Central Government, Cities with Separate Planning, the Grain Production Bureau of the Xinjiang Production and Construction Corps, and China National Grain Reserves Corporation:
In order to ensure compliance with the implementation of the National Minimum Food Purchase Price Plan and to improve the accuracy and consistency of grain purchase inspection results, we hereby issue this notice outlining key points that should be taken into account when implementing national standards for wheat and rice acquisition inspections.
**I. Matters to Be Noted in Wheat Acquisition**
1. **Determination of Wheat Grain Quality**
The quality of wheat is assessed according to the national standard GB/T 5493, "Inspection Methods for Grains and Oils – Type and Mixing Tests." During testing, the wheat kernels should be cut transversely to ensure a clean, smooth section. The glass-like or translucent parts of the grain are considered hard portions. If more than half of the kernel is hard, it is classified as a "hard kernel" (also known as a "hard plasmid"). The percentage of hard kernels in 100 grains is referred to as the "keratinocyte rate." According to the national standard GB 1351-1999, durum wheat with a keratinocyte rate exceeding 70% is classified as hard wheat.
2. **Black Wheat Germ Test**
According to the national standard GB 1351-1999, black embryos are considered diseased grains. Diseased grains have visible lesions on the surface that may damage the embryo or endosperm. When testing for black embryos, the grain should be cut from the middle of the lesion to check whether the embryo or endosperm is affected. Dark brown or black spots on the surface that do not affect the embryo or endosperm should not be classified as black embryos.
3. **Wheat Sprout Test**
As outlined in the national standard GB 1351-1999, sprouted grains are those in which the bud or young root has not exceeded the length of the kernel and has not broken through the seed coat. Germinated grains are identified by the fact that the seed coat has been ruptured or bulged, separating from the embryo.
**II. Matters to Be Noted in Rice Quality Inspection**
Appendix A of the "Rice" national standard (GB 1350-1999) does not specify moisture content requirements for whole milled rice samples. However, during actual testing, the moisture level significantly affects the results of the whole milled rice rate. To standardize the inspection process, the moisture content of rice samples used for whole milled rice testing should be controlled between 12.5% and 14.5% during the procurement phase.
**III. Strengthening the Implementation of Standards to Ensure Smooth Progress of Pre-Plan Acquisition**
Provinces implementing the minimum purchase price plan should enhance the promotion of national food quality standards, conduct timely quality surveys, and monitor current-year grain quality conditions to guide procurement and inspection work effectively. It is essential to enforce the certification system for inspection personnel, organize training sessions, comparisons, and centralized inspections to unify criteria and improve the consistency of test results. Each grain acquisition network should publicize national food quality standards, provide physical grade samples, and strictly adhere to the national standards during inspections.
**National Grain Administration Standard Quality Management Office**
June 2nd, 2006
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