Lori S. Marsh

Harvest and storage costs for bales of switchgrass in the southeastern United States

Abstract A simulation was done to compare harvest costs for large round bales (1·8 m diameter × 1·5 m wide) vs large square bales (1 m high × 1·2 m wide × 2·4 m long). Assumptions were made to give each system an idealized opportunity to harvest switchgrass yields of 4·5, 9 and 18 dry Mg/ha. Using the round bale, total harvest costs (mow-condition, rake, bale and move to an on-farm storage location) were

Optimal temperature setpoints for greenhouse lettuce

17·00,

Modelling thermal environment of a recirculating aquaculture facility

15·90 and

Optimization of biomass energy production in a village

19·15/dry Mg, respectively. For the square bale, they were

Microbial floc meal as a replacement ingredient for fish meal and soybean protein in shrimp feed

13·40,

Chronic toxicity of nitrate to Pacific white shrimp, Litopenaeus vannamei: impacts on survival, growth, antennae length, and pathology.

12·25 and

Evaluation of two types of bioflocs derived from biological treatment of fish effluent as feed ingredients for Pacific white shrimp, Litopenaeus vannamei.

11·95/dry Mg, respectively. Density of hay in the windrow affected the performance of the round baler; heavier windrows produced lower density bales, thus harvest cost increased as yield doubled from 9 to 18 dry Mg/ha. Comparing at 9 Mg/ha yield, harvest cost was 23% less for the square bale. The square bales must be stored in covered storage (

Evaluation of nitrifying bacteria product to improve nitrification efficacy in recirculating aquaculture systems

14·16/dry-Mg-delivered annual storage cost to achieve 3% storage/handling loss), while net-wrapped round bales can be stored outside on crushed rock (

Suitability of aquaculture effluent solids mixed with cardboard as a feedstock for vermicomposting.

3·20/dry-Mg-delivered annual storage cost to achieve 5% storage/handling loss). Total harvest plus storage costs, per-dry-Mg delivered basis, were

Major Cultured Species

20 for the round bale and