Although you must exercise caution when using soil-based substrates (see page 43), it is nevertheless true that soil contains a large quantity of many nutrients—far more than are produced through other fertilization methods. Apart from carbon, chlorine, hydrogen, nickel, and oxygen, soil will provide every other nutrient required by aquatic plants for a number of years. Because hydrogen, chlorine, nickel, and oxygen can be readily obtained from the water, it is possible to use just soil and C02 as a
Right: A thin layer of nutrient-rich substrate at the level of the lower half of the roots will provide a valuable long-term source of nutrients for all the rooted plants in the aquarium display.
Above: Liquid fertilization is a useful method of short-term fertilization, although correct dosage is important. Pour the measured dose into the water. Adding too much often causes more problems than adding too little.
complete fertilizing solution. During the first 6-12 months of soil use in the aquarium, carbon is also produced as C02 in sufficient quantities to make additional C02 fertilization unwarranted.
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