3.5. Nutrients budget
The nitrogen budget revealed that the main nitrogen input to the shrimp–tomato system was derived from addition of feed (43.6%), followed by fertilizer (22.7%) and filling water (19.8%). Nitrogen losses occurred primarily through the water discharged during harvest (66.9%), to the atmosphere (13.3%) and organic sludge (3.6%). Removal of shrimp and tomato plants at harvest represented a 13.2% and 2.1%, respectively. Phosphorus input to the shrimp–tomato system was derived principally from addition of feed (99.4%). Inlet water contributed with 0.5% (filling water, 0.3% and replacement of water levels, 0.2%) and .postlarvae with b0.1%. Phosphorus outputs from the entire system occurred primarily by accumulation of organic sludge (58.8%). Removal of shrimp and tomato plants at harvest represented 8.9% and 4.3%, respectively. Water discharge during the harvest accounted for 19%.
3.5. Nutrients budgetThe nitrogen budget revealed that the main nitrogen input to the shrimp–tomato system was derived from addition of feed (43.6%), followed by fertilizer (22.7%) and filling water (19.8%). Nitrogen losses occurred primarily through the water discharged during harvest (66.9%), to the atmosphere (13.3%) and organic sludge (3.6%). Removal of shrimp and tomato plants at harvest represented a 13.2% and 2.1%, respectively. Phosphorus input to the shrimp–tomato system was derived principally from addition of feed (99.4%). Inlet water contributed with 0.5% (filling water, 0.3% and replacement of water levels, 0.2%) and .postlarvae with b0.1%. Phosphorus outputs from the entire system occurred primarily by accumulation of organic sludge (58.8%). Removal of shrimp and tomato plants at harvest represented 8.9% and 4.3%, respectively. Water discharge during the harvest accounted for 19%.
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