Green Living @ Ho Yu General Studies “Theme-based Study Programme” 綠色生活 綠色校園可譽常識科主題式研習課程

 

可譽常識科主題式研習課程開展了!各位高小學生按照他們的意願,研習他們有興趣的課題。今年,「綠色生活」為可譽同學帶來了水耕種植。所謂水耕種植,是一種以營養液在水中栽種植物的技術,種植過程無需土壤,這種種植方法已經成為世界各地生產農作物的重要方法。

「『水耕種植』即是用水量較高嗎?」不少同學都有相似的疑問,老師語重心長地回答:「跟土耕比較,水耕種植的用水效益比較高呢!水耕所用的滴水灌溉方式用水量少80%呢!」「老師,使用營養液會破壞環境嗎?」老師繼續解答:「水耕種植以循環方式使用營養液,不會像土耕般因灌溉或雨水沖刷而流失養份,污染河流,影響生態。」同學紛紛點頭,表示認同。一位同學發現了地上的植物,問:「為甚麼地上的泥跟我們平時用來種植的泥不同呢?」老師解釋:「這是椰糠,不是泥土,用以固定植物的。其實椰糠是椰子加工後的廢棄物,用來固定植物,絕對是善用資源呢!」老師指向架上的植物,說:「其實垂直種植也可以,可以不用泥土又節省用地。」

這一天,在譽花園的溫室,高小同學圍著老師,專心地聽老師講解,並就水耕種植發問。聽畢老師的解答,同學對於水耕種植有更深入的認識,原來水耕種植完全合乎環保的效益,且能有效提高產量。

這樣看來,「綠色生活」提升了同學的環保意識,還讓同學有機會接觸一種重要的種植方法,實在令人大開眼界啊!

 

We are glad to announce that our “Theme-based Study Programme” for the senior primary students has already started. This year, we are introducing hydroponic farming, which has become an essential method of crop production worldwide.

In the Greenhouse located in Ho Yu Garden where the lectures take place, our students raise questions about hydroponics out of curiosity:

Student A: What is hydroponics?

Teacher: Hydroponics is a technique of cultivation of growing plants using mineral nutrient solutions in water. As it does not require sunlight and soil, it provides an alternative to outdoor soil-based farming.

Student B: Will the water consumption increase?

Teacher: Compared with soil-based farming, hydroponic farming has a high level of water efficiency. In hydroponics, the plant is nourished with nutrient-laden water by drip irrigation, which helps to reduce water consumption by 80%.

Student C: Does the use of nutrient solutions do any harm to the environment?

Teacher: No. The solutions are conserved in the tank, so there are no losses or changes of nutrients like they are in the soil. In the traditional soil-based farming where more fertilisers are used, the excessive fertilisers end up flowing into the rivers spoiling the water to be used by humans and animals.

Student D: Why do we see soil-like materials for the plants?

Teacher: It is not soil, but cocopeat, a growing medium made out of coconut husk. It is used to support the root system. Similarly, vertical hydroponic farming does not require soil and allows crops to be planted in multiple levels on a vertical axis for optimisation of space use.

Our students learn that growing with hydroponics comes with many advantages. The biggest of which is a significantly increased rate of growth in the plants. It is also beneficial to the environment because it reduces waste and pollution from soil runoff. Through the study, students not only acquire knowledge about a common plant growing method but also raise awareness of environmental protection.

 

 

 

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