有機同冇機的分別

2007-07-08 6:32 am
有機同冇機的分別

回答 (4)

2007-07-08 6:45 am
✔ 最佳答案
基本上係冇一種叫“冇機”植物的。
請參考「有機種植」:http://itied.ied.edu.hk/~gschool/Organic_farm.htm
有機種植 (Organic farming)
  有機耕種的建議
  (部份內容摘錄自《有機耕種:理論與實踐》及Blueprint for a green school。)
1. 為甚麼要用有機方法耕種
   現代化的耕種方法,使用大量化學肥料和化學農葯。這些東西雖然能在短時間內讓土地增產,但它們不單對人體有害,還會污染環境,擾亂生態,且令表土流失,泥土肥力逐年下降,同時使食品質量下降。故此從長遠著想,有機農業才是未來人類農業的方向。
2. 甚麼是有機耕種(Organic Farming)?
  有機耕種是一種按照自然規律來種植作物和飼養牲口的農耕方法。有機農夫會避免使用人工合成的化學農藥和肥料,他們會藉著輪種和循環動物廢料來保持泥土肥沃,平衡有益和有害的生物,並種出健康的作物來。
  有機耕種是可持續發展文化的基本構成部份,故此從長遠著想,有機耕種是人類未來農業的方向。
   自從七十年代開始,歐美、澳紐、印度等地,都有個人、團體、農場推動有機耕種方法,即是不用人工化學物質(農葯和肥料),致力在每一方面維持自然生態平衡,讓土地可以世世代代生產安全又有營養的食物。
2.1 有機耕種方法旨在:

生產營養價值高且對人體安全的糧食。
免除環境的污染及過度開發,以維持一個平衡,具生產力的生態系統。
2.2 有機種植的特點:
(1) 利用天敵對付害蟲
   每種生物,都會受到另一種動物或植物剋制,令生態長久保持平衡。故此,有機農夫便會利用這種原理來對付害蟲。
(2) 不用無機肥料及殺蟲藥
   由於製造無機農藥的工廠,產生不少污染,而且有機天然農藥含有比無農藥更多的成份可以作其他用途,即使丟棄,也會被大自然吸收,而不會造成污染。
(3) 避免大規模害蟲侵襲
  由於現代化的大規模農場傾向種植單一種植物,這便很容易受一種病毒或害蟲侵襲。有機種植主張在一塊土地上種植不同植物,以使害蟲無所適從。
   雖然各國和持不同觀點的人,在細節上均有不同的理解。但大體上,他們都會依著以下方針工作:
(1) 與自然合作而非駕御
  例如會盡量鼓勵多類生物在土地生活,以收以天敵對付害蟲之效;而非一開始便使用蟲葯(即使是天然的)來將它們滅口。
(2) 盡量使用可更新的本地資源
   例如以收集到的落葉代替由外國進口的泥炭土來作土壤改良劑。
(3) 盡量將各類可循環的循環再用
  例如將所有能夠用作堆肥的(包括各類農場廢物及廚房垃圾)全拿去堆肥。
(4) 減少任何會引致污染的活動
   例如營火會。又會以紫草葉代替草木灰作鉀肥用。
(5) 增加不同類型的野生物
  以保持泥土肥沃,使蟲害受到控制,同時亦盡了一己之責去保育大自然。
2007-07-08 7:22 am
Organic chemistry (有機化學) means the chemistry of the chemical which are related to the living organisms. In fact, most of the molecules in the living organism contain carbon as the building block or "backbone". In another words, the organic chemistry can be expressed as the chemistry of carbon containing compounds except CO2, carbonates and cyanide. Although the mentioned exceptions contains also carbon but they can be synthesized not by the living organism.
Inorganic chemistry (無機化學)means the chemistry of the compounds not from the living organisms. In fact, it is almost the complementary of the organic chemistry. Most of the time inorganic chemistry refers to the chemistry of metals.
In fact, in the modern chemistry, thanks for the contribution of the chemists' research, the boundary between organic chmeistry and inorganic chemistry is not so clearly cut as before. There are a lot of organic compounds which contains metals and also, there are a lot of inorganic compounds consisting of significant amount of organic molecules.
2007-07-08 6:44 am
有機= organic 冇機=inorganic

Organic chemistry talks about molecules. Inorganic chemistry is about metals, salts etc.......

Inorganic chemistry includes all the chemical compoundsbut none of organic compounds. Organic compounds includes C-H bonds.

Organic chemsitry includes the structure, properties, composition, reactions, and preparation consisting C-H bonds ( I've mentioned it just as the sentence above ). The reason we cann it "organic" because it is related to life processes.

2007-07-07 22:46:43 補充:
I mean, Organic chemistry talks about "living" molecules.

2007-07-07 22:48:25 補充:
The reason we call it organic because it is related to life processes. ( typing errors )
參考: myself
2007-07-08 6:39 am
有機係有化學咩.冇機係冇化學咩~!!!


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