Names of some PG diplomas are available in Canada after BSc Agriculture (Only in the province of Alberta)?

Restricting yourself to the only province of Alberta would only limit your university options. You would only find 2-3 universities max in the area of Alberts. Therefore, looking for all the opportunities in agriculture would be preferable. I'll mention all the options that would help you look into a broader view. 

The world's agricultural industries have a greater influence on people and the environment than agriculture. You are directly involved in the globe's efforts to feed, clothe, and fuel the world when you work in this field.
Courses after BSc Agriculture you can consider: 

• Master of Food Science and Agribusiness
• MBA in Agribusiness
• MSc in Plant Pathology
• Master's in Sustainable Agriculture
• Master's in Agronomy
• MSc in Agricultural Economics
• MScAgric in Genetics
• Master's in Plant Science
• MBA in Agriculture
• Master's in Agricultural Engineering
• Master's in Environmental Agrobiology
• MSc in Agriculture
• Master's in Agroecology

Postgraduate programs in agriculture sciences in Canada: 

At the University of British Columbia, Vancouver, Canada, at #37 in the worlds ranking 
Course offered: Master of Food Science (MFS)
Masters Degree
Entry score: 6.5
Total course fee: INR 2,220,222

At the University of Alberta, Edmonton, Canada, at #125 in the worlds ranking 
Course: Master of Agriculture in Agricultural Food and Nutritional Science - Plant.
Masters Degree
Total course fee: INR 1,140,577 

At Algonquin College, Ottawa, Canada
Course offered: Certificate in Food and Nutrition Management.
Entry score: 6.5
Total course fee: INR 860,630

Ontario College Graduate Certificate in Advanced Business, Toronto, Canada
Course offered: Management At Centennial College of Applied Arts and Technology.
Entry score: 6.5
Total course fee: INR 835,636

At the University of Toronto, Toronto, Canada, at #18 in the worlds ranking 
Course offered: Master of Forest Conservation.
Masters Degree
Entry score: 7.0
Total course fee: INR 2,992,296

At Memorial University of Newfoundland, St. Johns, Canada, at #601 in the worlds ranking 
Course offered: Master of Science in Food Science.
Masters Degree
Entry score: 6.5
Total course fee: INR 524,991

At the University of Saskatchewan, Saskatoon, Canada, at #501 in the world's ranking. 
Course offered: Master of Science in Soil Science.
Masters Degree
Entry score: 6.5
Total course fee: INR 879,454

Compared to other industries, careers in the agricultural sectors pay competitive incomes, allowing you to live a nice life and make a fantastic income.

There are many professions available in agriculture if you prefer a desk job, but if working outside with equipment and animals sounds like a lifestyle you could get used to, look no further. Your work-life balance won't improve despite summer activities like fruit picking and water skiing and winter ones like snowmobiling.