No, the Germans captured sufficient nitrates to cover several weeks at best. Haber mentioned the captured nitrates as being only incidental and stated Germany would have had to sue for peace in spring 1915 if Bosch and his team had not been successful in getting industrial production underway, which was around April/May 1915.
Well, "incidental" ... ? The Chile-Salpeter stocks in belgian harbours were well known to the "interested", producers of ahells, fuses and ammo in general like ... Rathenau.
His knoweledge about these nitrate stocks was at least one reason for him to contact the war ministry in early August 1914.
The dearth of pre-war planning aside, the Germans scrambled far less terribly than the other great powers, promptly securing whatever strategic resources were available and facilitating the industrial production of nitrates on a timely basis.
That's MO a misperception. The germans suffered (almost) as much as the Entente powers,
BUT
1. The Rathenau KRA for handling resources actually was established already at 14.08.1914. When did the Entente powers started to seriously look into resources and economics ?
The germans were just quicker to adress this problem of "war economy"
2. The "shell-crisis", happening in Germany as well as everywhere, was MUCH more publically covered in the Entente countries, also or still after the war, than in Germany.
There is and was just less talk around such crises in Germany than the Entente-countries.
And about "resources" in general :
At the beginning the germans - including "thinkers-about" as Rathenau and Moellendorff - just had no idea of what resources there actually were in Germany, as many factories producing export consumer goods were not thought of - like Faber-Castells production of pencil-sharpeners (there are hundreds of other producers and products).
Only their turn towards the war ministry, asking for contracts - as their former export contracts could now not be delivered due to the blockade - made them and their stocks of resources known and available for the war efforts.
I am curious about your opinion on the German industrial production of nitrates. Haber has stated the feasibility of industrial production of nitrates was still uncertain as late as September 1914 and it was ultimately the miraculous efforts of Bosch and his team that Germany was able to sustain the war beyond the first year. Elsewhere the German scientific endeavor and application of resources in the industrial production of nitrates has been compared to the Manhattan Project.
However, in September 1914 the German industrialists were still haggling over securing resources and remuneration, so from a business perspective, it would make sense to talk up the difficulty of an endeavor to maximize their share relating thereto. Further, the optimum catalyst for the industrial production for nitrates was only identified in July 1914. So was the German industrial production of nitrates less of a miracle and more of a case of war profiteering and good timing?
Well, the captured nitrates of Antwerp gave the industrialists the time for bickering with the war ministry. Initially they were less than inclined to start the necessary production, which included building the necessary factories as well.
They still "hoped"/"planned" for a short war in which case they rendered their investment into such factories as lost money ... if not payed "properly". And that's, what Haber meant with "unfeasible industrial production" : its economical sensibility at the time given. Bigger part of Bosch's workings to make it happen, was to convince the war ministry to set up contracts with guaranteed ammounts taken by the "market".