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) or feather meal (12.8% N) fertilizer. Values represent means across substrates (Organic Pro-Mix and Organic Miracle-Gro). Solid line in panel A was fit with nonlinear regression using a sigmoidal fit. Solid line in panel B was calculated using

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approved by the Organic Materials Review Institute, including fish emulsion or feather meal as sources of N. Fish emulsion is applied as a direct liquid application to the soil of the in-row area or is injected through the drip irrigation system. Feather

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Review Institute-approved fish emulsion or feather meal in organic systems. Most species of blueberry are adapted to low soil pH conditions in the range of 4.5 to 5.5 and require NH 4 -N over NO 3 -N for uptake. Nitrogen uptake increases throughout the

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injected through the drip irrigation system and granular feather meal as N fertilizer sources. Supplying N from feather meal or fish fertilizers has an estimated product cost to growers of $10 to $25/kg N applied. Application of surface mulch has been shown

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importance for the economical production of organic blueberry ( Strik, 2014 ). Fish solubles and feather meal are common fertilizers used by organic blueberry growers. Fish solubles are typically applied by fertigation through the drip irrigation system

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equivalent N mineralization rates (58% to 64% of total N converted to mineral N within 28 d) for a variety of fish and feather meal fertilizers commonly used by organic growers. We found that cumulative yield was 3% higher when fertilizing with lower rates of

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), fava beans ( Vicia faba ), and barley ( Hordeum vulgare )] before application of varying rates of N as granular feather meal ( Gaskell, 2004 ). This study found that pepper yields increased with increasing rates of N as feather meal and that yields at

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trial was initiated in 2006 to study management practices, including planting method (raised or flat beds), fertilizer source and rate (feather meal and fish solubles at “low” and “high” rates of 73 and 140 kg·ha −1 N at maturity), and mulch type

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report on a study to evaluate the contribution of N from a mixed legume/cereal cover crop and organic fertilizer (feather meal + blood meal) to an organic broccoli crop and to evaluate the economic benefits of cover crop use. Materials and Methods

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In 1993, the Arkansas poultry industry produced 1.048 billion broilers with a total live weight of 2.54 million metric tons. Depending on the type of processing used, from 30% to 50% of live weight can end up in the waste stream. Three primary waste-stream products are generated by the poultry industry: feather meal, poultry meal, and bone meal. Feather meal contains ≈14% N, poultry meal 11% N, and bone meal 8% N. Byproduct additions were made to tomato, marigold, and impatiens transplants at the rate of 6, 12, 24 and 48 g/10-cm pot. The two highest rates killed plants outright, while the lower rates resulted in some growth reduction when compared to the control. Studies are under way to further evaluate the use of these byproducts in an organic production system for tomatoes and bedding plants.

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