By M. J. Frissel
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30t. 30r. 31. Input by seeds or seedlings Transfer by net uptake from soil Transfer by net uptake from soil Input by uptake from atmosphere TOTAL 3. 4. 18. 26. 27. Transfer by consumption of harvested crops . 6 11 42 SUPPLIES-REMOVALS + 0 0 0 Changes in amount of animal component SUPPLIES: 1. 2. 3. 4. REMOVALS: Input by feed for livestock Input by litter used indoors Transfer by consumption of harvested crops Transfer by grazing of forage TOTAL . 4 ( + i) 1 0 0 Changes in amount of total soil component SUPPLIES: 8.
13a. 14. 15. 16. 17. 26a. 27. R E M O V A L S : 19. 20. 21. 22. 23. 24. 25. 30t. 30r. Transfer by application of manure and/or waste . Transfer by droppings on grazed areas Input by application of manure Input by fertilizers Input by N-fixation Input by application of litter, sludge and waste . Input by irrigation and flooding Input by dry and wet deposition Transfer by weathering of soil mineral fraction . Transfer by mineralization of soil organic fraction Transfer by plant production remaining on field .
9. Droppings have been calculated on the assumption that animal retention o f ingested nutrients is accounted for in removal o f animal products. Hence total excreta returns equal consumption minus production. I t is estimated that o f the total nutrients ingested by sheep some 35% o f N , 95% Ρ and 15% Κ are excreted in faeces while the remainder appears in the urine. 12. , 1975). 15. Data o f Heal and Perkins (unpublished data, 1 9 7 5 ) using data from Crisp ( 1 9 6 6 ) , Gore ( 1 9 6 8 ) and Martin and Holding ( 1 9 7 6 ) .
Cycling of Mineral Nutrients in Agricultural Ecosystems by M. J. Frissel