Contents: Preface. 1. Some statistical results and completely Randomised design (CRD). 2. Randomised complete block design (RCBD). 3. Factorial experiments. 4. Split-plot design. 5. Split split plot design. 6. Latin square design (LSD). 7. Incomplete block designs for plant breeding trials. 8. Transformation of data. 9. Series of experiments. 10. Analysis of co-variance. 11. Long term experiments. References.