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- She occasionally applies a little commercial fertilizer.
- These systems are fertilized with on-farm sources, and are less prone to leaching as compared to commercial fertilizers.
- Conservative estimates report 30 to 50 % of crop yields are attributed to natural or synthetic commercial fertilizer.
- Without commercial fertilizers it is estimated that about one-third of the food produced now could not be produced.
- He still uses commercial fertilizer because he says the natural stuff _ manure _ contains too much salt for almond growing.