Homegrown

C/N ratios of some compostabl­e materials Material C/N Ratio

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Cow manure ................................................ 15 Eucalypt bark ............................................ 250 Sawdust (old) ........................................... 200 Eucalypt sawdust (fresh) ..................... 500 Grass clippings .................................... 20-25 Leaves (mature) ........................................ 60 Lucerne hay ................................................ 13 Paper ........................................................... 170 Peanut shells ............................................. 12 Pine bark (fresh) ..................................... 500 Composted pine bark (average) ........ 200 Poultry manure ............................................. 7 Poultry litter ......................................... 1011 Rice hulls ................................................... 140 Mixed weeds .............................................. 19 Straw (wheat) .......................................... 128 Straw (general) ........................................ 100 Straw (oat) .................................................. 48 Corn stalks, leaves and cobs ...... 50-100 Oak leaves ................................................... 50 Bracken leaves .......................................... 48 Green rye grass ......................................... 36 Ash leaves ................................................... 30 Clover (old plants) ............................. 20-30 Vegetable peelings ........................... 20-30 Fruit wastes ............................................... 35 Well-decomposed manure (average) 20 Seaweed (average) ........................... 20-25 Pea or bean plants ................................... 15 Clover (young seedlings) ........................ 12 Cabbage heads .......................................... 12 Tomato leaves and stems ..................... 12 Mature compost ....................................... 10 Comfrey leaves ......................................... 10 Chicken litter (average with sawdust)10 Chicken manure (no sawdust) .................. 7 Blood meal ..................................................... 4