Among several research programs initiated to develop appropriate technologies to combat the growing problem of salinity, developing salt-tolerant varieties may be the most important technological advance for low-cost management of agricultural production in the affected areas. To implement the research program, some 20 activities were identified in the table and three time estimates were collated, based on the opinions of many breeders with long experience in developing varieties.

TASK Activities Estimates ID Pred. Succ. to tm to Grow donor plants a 6 16 20 24 Cross & harvest F1 seeds b la C 8 Rear F1 plants I b e 8 12 16 Procure chemicals, etc. d- le 12 20 32 Determine polar stage plant Ft anthers for induction le do 9 4 10 12 Prepare aseptic growth room 7 - 19 8 12 20 Plant calli; regenerate plants: screen for salt tolerance 19 le, f h 4 8 12 Screen plantlets in culture solution for salt tolerance h 19 4 5 8 Identify haploids: create diploids lih 4 5 18 Transfer plantlets to field for screening and seed production Ik 8 12 16 Screen material at Network sites KU 17 12 20 25 Select homozygous lines for agro-edaphic environments Ik Im 16 20 24 Test material in on-station trials m! In 16 20 24 Data analysis nim o 4 8 12 Nominate entries for National Screening Nursery o in lo 16 20 25 Promote entries to National Trials loo 9 30 40 50 Evaluate on-farm in farmers fields lo lo Ir 15. 2024 Farmers' Field Days Ir p S 13 4 5 Release of cultivar by Variety Release Committees sla + 5 8 12 Overall analysis and report writing ts 10 12 15 to represents the optimistic time, tm represents the mean or average time, and to represents the pessimistic time; all numbers are in weeks a. Construct the project network. b. Determine the project duration. C. Determine the critical path