The Nissan will work just fine as any lift truck in your application. Being in a fertilizer enviroment means you will have a lot of maintanence issues no matter what brand you use - the dust get into everything. Have the unit PM very frequently - oil, grease, filters, cable checked and terminal s/cconnectors coated with a dielectric grease. Blow the unit off with compressed air daily will help some.. Oil/grease is cheaper than metal. Things like parking brake cables will freeze up.
Would recommend you have the forklift fitted with solid "soft ride" type tyres to reduce road shock transmission - tehy cost a little more but well worth the investment.
I know that many of the Japanese brands have a special option for forklifts working in fisheries where they are exposed to briney water this can help in a fertilizer plant too.
Would not recommend any type of electric unit for this application - fertizer dust will not only get in the controls but motors connectros & you'll have more issues than you want. Especially, in a humid climate. All that savings for electrics is true in a "normal & clean" work site with smooth floors. For extended operating hours you would need spare batteries & a battery change out station.
Since fertilizer dust is explosive you might want to check with your local authorities what type of safety rating the truck will require. In the US we have governmental regulations like this.
You may want to conside more than one forklift. Should your forklift be down for mainteance or repair you have no "back-up" & you are shutdown.