I think a pendlay row applies some pressure to your lower back, so i am trying to toughen it up.

I cant do pendlay rows as the weights i use are too short so they dont have enough height (also seems like a more advanced form of exercise to me ), so after reading around some say bent over rows is fine (but with a 90 degrees bend).

Would this be ok or are there any alternatives?

whilst pendlay rows also work the lower back, they don't apply 'too' much pressure to the lower back - when you have the strength to keep your core tight, and also can hold the posture with your legs. And another reason is when people stand stiff legged and do more of a romanian deadlift than an actual pendlay bendover row.

I think those are the weak points for most people, and also are the reason for the lower back having to bear most of the load and why it can lead to pain or injuries.

These here are the most common mistakes to avoid that can also cause pain when doing the rows:
https://www.youtube.com/watch?v=4xq3BsKTzYo

I mostly feel them in my quads and the upper back, and only a little bit on the lower back.

But if you feel uncomfortable with them you can either simply do them with lower weight until you have build up the needed strength, or do dumbbell variations.

(unless you have a lower back injury of course that keeps you from executing them)

If the weights are too "short" (i guess you are just using the small 1,25 -5 kilo plates then? ) you could simply place some of the bigger weightplates on the floor left and right of you, to give you the correct pickup height, or use some wooden boxes or stepper boxes, or a bench to achieve the same.

(additionally you can look around in your gym - if you are in one - to look for the light plates in regular size. Most gyms have the light plates 1,25 - 5 also in the same circumference as the heavier ones)

Here is a how to pendlay row:
https://www.youtube.com/watch?v=Weu9HMHdiDA

And here a bendover barbell row:
https://www.youtube.com/watch?v=9efgcAjQe7E

T-Bar rows:
https://www.youtube.com/watch?v=j3Igk5nyZE4

you can also do every dumbbell variation of bendover rowing:
i.e.

https://www.youtube.com/watch?v=pYcpY20QaE8

you can also perform the pendlay rowing with dumbbells and either place them on boxes, bench etc as mentioned before, or simply just sink them down to the prefered point, and lift them out of the holding position again. Or use a bench as posture support and row them from the ground:
https://www.youtube.com/watch?v=3pH5T8yIMpE

Thanks for all the links and info.

I was doing pendlays when i had a twitch in my lower back and since then i'm a little nervous. I was using a few 10KG disks (I train at home). To combat this i want to strengthen my lower back as thats where i feel some pressure (and i know this is my weak point).

Since then i decided to lower the weight and instead of low reps and high weight im doing high reps and low weight and get my form correct. Since you have mentioned pendlays shouldnt/dont apply pressure to the lower back i think i need to strengthen this up in order to have a better core but at the same time i want to continue with the program im following.

Will look into the links you provided as they seem useful. Thanks again