Results from this study suggest that commercially pelletized
organic fertilizers are a viable option for California organic rice
growers and may be economically competitive with poultry
litter in continuously flooded fields. The pelletized materials
address grower concerns in that they are readily available, less
bulky than poultry litter and, based on 2 yr of data, appear to
have a more consistent nutrient content. Advantages of thepelletized fertilizers over poultry litter were (i) higher and more
predictable N concentration, (ii) higher amount of mineralizable
N, (iii) higher NRE, and (iv) better grain yield response.
We found no consistent diff erences between the pelletized
products. Based on one fi eld study, we found that fertilizer
applications to fi elds that will experience a prolonged drain
for weed control may not be economically advisable. Further
investigation of N dynamics in noncontinuously fl ooded rice
systems, coupled with the establishment of appropriate rates for
these fertilizers would allow for the development of improved
N management strategies for organic rice production systems
Results from this study suggest that commercially pelletized
organic fertilizers are a viable option for California organic rice
growers and may be economically competitive with poultry
litter in continuously flooded fields. The pelletized materials
address grower concerns in that they are readily available, less
bulky than poultry litter and, based on 2 yr of data, appear to
have a more consistent nutrient content. Advantages of thepelletized fertilizers over poultry litter were (i) higher and more
predictable N concentration, (ii) higher amount of mineralizable
N, (iii) higher NRE, and (iv) better grain yield response.
We found no consistent diff erences between the pelletized
products. Based on one fi eld study, we found that fertilizer
applications to fi elds that will experience a prolonged drain
for weed control may not be economically advisable. Further
investigation of N dynamics in noncontinuously fl ooded rice
systems, coupled with the establishment of appropriate rates for
these fertilizers would allow for the development of improved
N management strategies for organic rice production systems
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