The seed purity reflects the percentage of seeds that genetically truly belong to this species to the total number of seeds. The traditional method of testing seed purity is carried out using the field test method. However, this test method takes a relatively long time, but now it is generally used the analysis of the chemical composition of the seed. This kind of analysis method is fast and accurate. The level of purity directly affects the yield of crops. Using wheat as an experiment, the following conclusions are drawn by using a seed counting instrument to measure the weight of future seeds of different purity seeds:
purity
%
Effective panicles 10,000 ears/hm2
Grain number/spike
Thousand grain weight
g
Community production ∥kg
Equivalent output
Kg/hm2
I
II
III
average
99.0 (CK)
465.0
38.2
35.1
81.6
83.6
84.4
83.2
6 240
95.0
454.5
37.8
34.4
80.2
78.2
78.0
78.8
5 910
85.0
504.0
32.1
33.9
77.6
73.8
67.6
73.0
5 475
75.0
460.5
32.0
32.8
70.8
63.8
58.6
64.4
4 830
65.0
438.0
28.0
32.2
59.6
54.4
43.8
52.6
3 945
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