I'm not familiar with Pakistani agriculture, but I believe it probably is a result of more technology in the seed gene pool, as well as higher soil fertility levels.
No
The average potato yield per hectare is 14-19 tonnes per hectare. The variety of potato and climate can have an effect on yield.
I don't know what the world average is, but the US average is around 8,800 kilograms per hectare for the grain yield.
10
15 Metric Tonne/Hectare
15.36 Tonnes per hectare. Mike Solari, New Zealand
Higher than you think
About 2.88 metric tons per hectare, according to the USDA.
In my experience, the theoretical yield is usually higher, if everything is measured accurately.
India's crop yield per hectare is much lower than the global average, according to UN's Food and Agriculture Organisation (FAO). Water shortage, lack of availability of high-yield varieties of seeds and lack of research and development has been quoted as the primary reason behind the low per-hectare yield of crops in India.
This depends on the application; if you need to produce a specific compound a higher yield is of course preferred.
The U.S. average yield for 2010 was 46.6 bushels/acre or 2.92 tonnes/hectare. The figures for 2011 are slightly lower, at 43.0 bushels/acre or 2.89 tonnes/hectare. According to the US Department of Agriculture, the US average soybean yield for the period 2006 through 2011 was 42.22 bushels per acre.