1.   Another useful salt is plain old chemical fertilizer.

2.   Farmers have been criticized for their excessive use of chemical fertilizers.

3.   I suppose such things were happy on our land because we never put chemical fertilizers on it.

4.   Many crops are grown with chemical fertilizers.

5.   The colonial world can be hit by a shortage in chemical fertilizers.

6.   The long-term dangers of land degradation from irrigation and chemical fertilizers are growing.

7.   The other was an agricultural revolution based on chemical fertilizers, irrigation, and improved seed strains that dramatically expanded food supplies.

8.   The use of chemical fertilizers has turned the farmer into a cross between an industrial chemist and a mechanic.

9.   The use of soluble chemical fertilizers is banned, as they seep into rivers and pollute the water supply.

10.   Without earthworms and other soil life, no amount of cultivations and chemical fertilizers will build and sustain true structure and fertility.