(6) Tree and shrub seed samples (as categorized by AOSA Rules for Testing Seeds Vol. 3. Uniform Classification of Weed and Crop Seeds) shall consist of at least 600 seeds per sample for germination purposes (1,000 seeds for paired tests). If a purity analysis or a noxious-weed seed examination is required, the submitted
Primary Samples: A small quantity of seed taken from a seed lot in one single sampling action. Composite Sample: A sample, which comprises all the primary samples taken from a seed lot. Submitted Sample: A sample submitted to the seed laboratory for testing. The sample may comprise either the whole of the composite sample or a divided subsample.
A composite sample is obtained from the seed lot by tak-ing primary samples from different positions in the whole seed lot and combining them. From this composite sam-ple, subsamples are obtained by sample reduction proce-dures at one or more stages forming the submitted sample and finally the working samples for testing. For issuing
AASCO - Handbook on Seed Sampling
The AASCO Handbook on Seed Sampling presents methods, guidelines and equipment for both regulatory and industry applications to uniformly obtain representative seed samples for laboratory testing. It also provides sampling procedures for the USA Accredited Seed Sampling Program (ASSP) for national and international certification and may be ...
Primary Sample: each probe, trier, or handful of seed removed from the lot. (Figure 3a.) Composite Sample: formed by combining and mixing thoroughly the primary samples prior to submission for testing. (Figure 3b. & 3c.) Submitted Sample: sample is subdivided from the composite and submitted to laboratory for testing (Figure 3d). Working Sample ...
Seed sampling: The process of obtaining a seed sample of a size suitable for test in which the same constituents are present as in the seed lot and in the same proportions. Primary sample: A primary sample is a small portion taken from one point in the lot or container or bag.
Seed Sampling Procedures - California Crop Improvement …
Composite samples shall be obtained to determine the quality of a lot of seed, such as the percentages of pure seed, other crop seed, weed seed, inert matter, noxious weed seed, germination, varietal purity, freedom from disease, and effectiveness of seed treatment.
Definition and Classification of seed samples
Definition of seed sampling. Sampling is the procedure of selecting a fraction of total population, about which information is needed to represent that population. The method of taking a sample is called sampling. Types/Classification of seed sample: Types of seed sample- 1. Primary sample. 2. Composite sample. 3. Submitted sample. 4.
Seed tests tell if a crop of seeds is worth collecting, if handling procedures are correct, and how many potential seedlings are available for regeneration. The earliest form of seed analysis, the cut test, is still often used today.
Handbook on Seed Sampling, 3rd Edition, 2022 - Handbooks ...
This handbook should prove valuable to those concerned with sampling of seed at all stages of production and testing. It is essentially a practical guide but contains elements of sampling theory to emphasize the important part sampling play in measuring seed quality. Main highlights of the handbook are: Chapter 3: Responsibilities in sampling.