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C/N比.
C/N比(シーエヌひ、Carbon to nitrogen ratio)とは、有機物などに含まれている炭素 (C) 量と窒素 (N) 量の比率(質量比)。炭素率ともいう。
たとえば、ある有機物に炭素100グラム、窒素10グラムが含まれている場合、この有機物のC/N比は10である(10倍)。
平均的な畑地土壌のC/N比は12前後とされる。C/N比はおおむね20を境として、それより小さい(つまり窒素が多い)と、微生物による有機物分解の際に窒素が放出され(無機化)、C/N比が大きいと反対に土の中の窒素が微生物に取り込まれる(有機化)といわれている。そのため、C/N比の大きな有機物を土に施すと、窒素が微生物に取り込まれ、作物の利用できる窒素が少なくなって窒素飢餓に陥る。これは、土壌中にアゾトバクターなどの窒素固定微生物が増えるにつれて起こりにくくなっていく。
有機物
|
C/N比
|
稲わら |
60
|
もみ殻 |
75
|
米ぬか |
23
|
小麦わら |
90
|
広葉樹落葉 |
50 - 120
|
針葉樹落葉 |
20 - 60
|
マメ科植物 |
10 - 17
|
樹皮 |
100 - 1300
|
おがくず |
134 - 1064
|
剪定枝 |
70
|
十分に生長した雑草 |
50
|
ピートモス |
52
|
竹 |
280
|
椰子繊維 |
48
|
牛糞 |
16
|
豚糞 |
11
|
鶏糞 |
7
|
おから |
11
|
コーヒー粕 |
23
|
油粕 |
7
|
茶粕 |
12
|
ビール粕 |
11
|
焼酎粕 |
12
|
光合成細菌 |
80
|
カビ |
13
|
糸状菌 |
9
|
細菌・放線菌 |
5
|
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