"उर्वरक" का संशोधनहरू बिचको अन्तर
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== वाह्य सूत्र ==
* [http://aggie-horticulture.tamu.edu/extension/veghandbook/chapter3/chapter3.html The Texas Vegetable Growers' Handbook, Chapter 3] Soils and fertilizers in agriculture.
* [http://www.tfi.org/factsandstats/fertilizer.cfm The Fertilizer Institute] Basic information about fertilizers
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