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SmartGrow Hair Fiber Mat (10-inch)
"I used it in my potted lemon tree and let me tell you, it accelerated my lemon tree growth - new leaves and fruit" M. Dawood, Layton UT

4. Soil Nitrogen Test

A test for soil nitrogen will determine the total nitrogen potentially available to the plant for uptake including that from organic matter, nitrate and ammonium sources. Although considered the most important nutrient for plant growth, it is not typically evaluated since the levels fluctuate with rainfall, soil temperature and microbial activity. May be useful information in dry climates (less than 20 inches annual rainfall) and where crop production and large scale fertilization practices are presented. Also may be useful when an over application of nitrogen fertilizer is suspected to have caused root/foliar burn and dieback

Cost: $23.50