Seed Testing for Grade 12 students. PPts

Agriculture

1. Good Afternoon, Class!

2. At the end of the period/lesson the students should be able to: Conduct seed testing to evaluate the viability and quality of seeds Conduct Ragdoll Method of seed germination

3. C rucial practice in agriculture, ensuring the quality and viability of seeds before planting . It helps to determine the percentage of seeds that will germinate, identify potential problems , and ultimately optimize crop yields and profitability.

4. Types of Seed Testing 1. Germination Test- This test determines the percentage of seeds that will germinate under optimal conditions.   Example: Germination Percentage (GP) No. of Total Germinated Seeds = 80 No. of Seed Tested = 120 GP= 80/120 X 100 = 0.667 X 100 = 66.70 %

5. Types of Seed Testing 2. Purity Test-  This test determines the percentage of pure seed in a sample, excluding weed seeds, inert matter, and other impurities. It ensures the genetic purity of the seed lot and prevents the introduction of unwanted plants.  Example: Weight of “pure” seed = 80grams Total weight of the sample = 200 grams

6. Types of Seed Tests 3. Vigor Test-  This test measures the speed and strength of germination, indicating the overall health and potential of the seed.  Formula: Vigor index (VI) = Root length + Shoot length x Seed germination % 

7. Types of Seed Testing 4. Disease Test-  This test detects the presence of seed-borne diseases, which can cause significant crop losses. It helps prevent the spread of diseases and ensures healthy seedlings. 

8. Types of Seed Testing 5. Physical Tests-  These tests assess seed size, weight, and shape, which can indicate seed quality and potential for uniform germination.

9. Methods of Seed Testing

10. Seed Testing Methods 1. RagDoll Method-  This simple method involves placing seeds on a damp cloth, rolling it into a tube, and placing it in a warm, dark place. It is a common method for germination testing. 

11. Seed Testing Methods 2. Petri Dish Method-  This method involves placing seeds on damp filter paper in a petri dish, providing a controlled environment for germination. It is often used for laboratory testing and research. 

12. Seed Testing Methods 3. Seed Box Method-  This method involves placing seeds in a container with a controlled environment for germination. It is a more practical method for larger seed samples. 

13. Seed Testing Methods 4. Floating Test-  This test involves placing seeds in water to determine their viability. Seeds that sink are typically viable, while those that float are often damaged or empty. 

14. Seed Testing Methods 5. Plate/ Paper Test - Seeds are placed in between two moist germination papers and rolled together to look like a rolled towel . The rolled towels are placed inside the germination cabinet/room for incubation

15. Activity 1 The students will be divided into 10 groups, each assigned a different method. Each group will then present their assigned method to the rest of the class.

16. If you will be a farmer who specializes in producing high-quality soybean seeds. You recently harvested a new batch of soybean seeds and want to evaluate their quality before selling them. How will you do the assessment?

17. Any volunteer who will briefly discuss the summary of his/her learning about the lesson of the day which is Seed Testing.

18. Importance of Seed Testing Seed testing is an essential practice in modern agriculture, ensuring the quality and viability of seeds , preventing disease spread , and maximizing crop yields . By understanding the different types of seed tests, methods, and their importance, farmers can make informed decisions about seed selection and planting, leading to more productive and profitable harvests

19. Evaluation/ Assessment The students will have an individual hands-on demonstration of the specific seed testing method that will be assigned to them in random selection.

20. Thank you for listening !

21. Assignment for next lecture… Read and study in advance the seed scarification method