Absolutely dont listen to this advice. Probably a slight ph issue but other then that ok. I usually dont feed nutes until cotyledons start to yellow out.
It depends on alot of factors. Are we talking major strains like og, diesel, blueberry and such then the answer is definately but if we are talking joe smoes pollen chucked orange snozzleberry then no way man. You see my point
Yes you can get 2lbs with a 1000w you can also get 14 grams from the same 1000w. Your skill levels, genetics, and many other factors will determine your ultimate yield
Nobody can tell you what you are gonna yield. Heres a guideline to guesstimate
first time growing less then .5 grams per watt
ok grower .5 grams per watt
good grower .75
Excellent grow 1 gran per watt
over 1 gram per watt and you are seriously dialed in