cual es la diferencia entre estas dos frases?. what's the difference between those sentences.
1. De tulpen zullen heel veel water blijven opnemen

2. De tulpen zullen heel veel op blijven nemen

Question

cual es la diferencia entre estas dos frases?. what's the difference between those sentences.
1. De tulpen zullen heel veel water blijven opnemen

2. De tulpen zullen heel veel op blijven nemen

Answer

In the second sentence, you left out the word 'water'. I assume that is not part of your question, but that it is about the place of 'op'. 
There is no difference in meaning between the two sentences. Some people prefer one version, other people the other. It's partly a regional thing (a difference between The Netherlands and Flanders), partly personal preference. 
You can use both.