S1 Geography | Hong Kong Agriculture and Fisheries: Farmland, Self-Sufficiency and Aquaculture

S1 Geography | Hong Kong Agriculture and Fisheries: Farmland, Self-Sufficiency and Aquaculture – Tutor Prep Guide

2026-11-15

Tutor lesson-prep guides · Junior Secondary Geography

Students assume Hong Kong is only towers, so “Hong Kong has farming” sounds like a joke to them. This lesson uses two numbers to give the real scale – 730 hectares, 2,400 farms, 1.5% vegetable self-sufficiency – then asks why farmland is kept at all.

Objectives — Students can: (1) state Hong Kong farmland area, farm numbers and main produce, and give three reasons why farming has shrunk; (2) divide local daily output by daily consumption to find vegetable self-sufficiency and explain what 1.5% means; (3) distinguish capture fishing from aquaculture and give two reasons for keeping farmland or fish ponds.

01 Prerequisites (3-minute check)

If any of these fails, fix it before the lesson starts.

Skill	Quick check	Pass mark
Percentages	Local output is 30 and total consumption is 100. What is the self-sufficiency rate?	30%
Area units	How many square metres are in one hectare?	10,000 square metres
Land use in Hong Kong	What are the main land use types in Hong Kong?	Residential, commercial, industrial, transport, institutional and open space

02 Lesson flow (45 minutes)

Time	Stage	Tutor does	Student does
0-5 min	Break the assumption	Ask whether Hong Kong farms anything, then write 730 hectares and 2,400 farms	Yes, but at a very small scale
5-16 min	Farmland and produce	Explain fragmented farmland in the New Territories, leafy vegetables and flowers, then ask why land is abandoned	Import competition, labour shortage, urban expansion
16-28 min	Self-sufficiency	Model it: 2,000 tonnes consumed daily against 30 tonnes produced locally	Get 1.5% and note 98.5% is imported
28-37 min	Two kinds of fishing	Contrast capture (distant waters) with culture (ponds, raft culture) and their limits	Give one limit for each
37-42 min	Why keep farmland	Ask what 1.5% self-sufficiency is worth	Fresh leafy vegetables, land reserve, ecology, rural landscape
42-45 min	Exit check	Ask what a 1.5% self-sufficiency rate tells us	Heavy import dependence and a very small local sector

03 Teaching script (read it out)

Scene 1: Farmland and farms: two numbers set the scale

Do not start with policy. Start with two numbers: about 730 hectares of farmland and about 2,400 farms. Divide them and the average farm is about 0.30 hectares, roughly 3,000 square metres, about a third of a football pitch. Once students hear “a third of a football pitch” they understand that Hong Kong farming is small scale family farming, not the hundreds of hectares of a foreign estate, and the question “why can output never meet demand” answers itself. Then explain the product mix: leafy vegetables, flowers and a little fruit, because leafy crops spoil quickly and short transport gives local growers a freshness advantage, while rice and root crops store well and imports are cheaper.

Ask students to divide 730 by 2,400 and say what the result tells them

Scene 2: Self-sufficiency: one percentage explains the whole structure

There is only one formula: local output divided by total consumption. For vegetables, the city consumes about 2,000 tonnes a day and local farms produce about 30 tonnes, so 30 / 2,000 = 1.5%, meaning 98.5% is imported. Push students to read two layers into that number. The first layer is quantity: the local sector contributes very little to total supply. The second is function: that 1.5% still supplies leafy vegetables picked and sold the same day, and when cross-border transport is disrupted by a typhoon or a port incident, it is the buffer. Low self-sufficiency does not mean farming is worthless, and exam questions love to trap students exactly here.

Ask students to calculate the 98.5% and state two meanings of a low rate in one sentence

Scene 3: Fisheries: capture and culture are different operations

Students treat fisheries as one thing, so separate them. Capture fishing takes fish from open water; Hong Kong waters yield less because of pollution and overfishing, so vessels travel further, which raises cost and risk and brings in closed seasons and quotas. Aquaculture raises fish in controlled water: freshwater pond fish mainly in the northwest New Territories and marine fish in rafts, with steadier output but exposure to water quality, disease and competition for land. The distinction to remember is the degree of control: capture cannot control how many fish exist, culture controls the environment but not the market price.

Ask students for one limitation of each method and which one gives steadier output

04 Question types and worked steps

Type	Example	Steps	Answer
Self-sufficiency calculation	The city consumes 2,000 tonnes of vegetables a day and local farms produce 30 tonnes. What is the local self-sufficiency rate?	(1) The numerator is local output (2) 30 / 2,000 (3) multiply by 100 for a percentage	1.5%, so 98.5% is imported
Average size	Farmland is 730 hectares across 2,400 farms. What is the average farm size?	(1) 730 / 2,400 (2) the unit is hectares (3) convert to square metres	About 0.30 hectares, roughly 3,000 square metres
Classification	Which is more sensitive to water quality, pond fish culture or distant-water capture? Why?	(1) Identify the operation (2) culture happens in enclosed water (3) water quality affects survival directly	Pond culture: small water bodies, slow exchange, so pollution or disease affects the whole pond
Discussion	Vegetable self-sufficiency is only 1.5%. Should Hong Kong abandon local farming entirely?	(1) State the quantitative weakness (2) state the functions (3) give a position	No: the quantity is small but the functions are not replaceable, so good farmland should be kept

Sanity check (teach this): Run a three-part percentage check: (1) is the numerator local output, not imports; (2) is the denominator total consumption, not a double count; (3) is the answer between 0 and 100% – a figure like 6,667% means the fraction was inverted. For area questions check the unit, because hectares and square metres differ by a factor of 10,000.

05 Independent practice (3 questions)

Question	Answer	What to watch
Consumption 2,000 tonnes a day, local output 30 tonnes: what is the rate?	1.5%	Check they did not invert the fraction
730 hectares across 2,400 farms: average size in square metres?	About 3,000 square metres	Did they multiply by 10,000?
Why is local farming dominated by leafy vegetables?	They spoil fast, so local freshness is an advantage	Do they mention shelf life?

06 Common mistakes and what to say

Mistake	Student writes	Say this
Inverting the fraction	2,000 / 30 = 66.7, so self-sufficiency is 66.7%.	“Self-sufficiency asks what share of the city the local crop covers, so the numerator must be 30. Redo it as 30 / 2,000.”
Believing there is no farming at all	Hong Kong is a city, there is no farming, all food is imported.	“There are about 730 hectares of farmland and 2,400 farms, just at a small scale. Saying none is a factual error.”
Mixing capture and culture	Fishing just means going out to catch fish, fish farming is the same.	“Catching fish means you cannot control the catch; pond culture controls the environment. The limitations are completely different.”
Losing the unit	The average farm is 0.30 square metres.	“0.30 is hectares, not square metres. One hectare is 10,000 square metres, so it is about 3,000.”

07 Homework (paper, section and question numbers)

Water supply chapter, question 3 (local versus external resources) — The same local-control versus external-dependence frame, applied to food
Weather and climate chapter, question 2 (rainfall and farming) — Rainfall and season drive leafy vegetable yields and prices
Map reading and scale chapter, questions 1-3 (farmland distribution) — Northwest farmland and fish ponds are located on maps with a scale

08 Exit check (last 5 minutes)

Question	Answer	Decision
What is the local vegetable self-sufficiency rate?	About 1.5%, so 98.5% is imported	Answering 30% means output was treated as a rate
Give two reasons why farming has shrunk.	Import competition and farmland being abandoned or redeveloped	One vague reason is not enough
Which fishing method gives steadier output?	Aquaculture, because the environment is controlled	Answering capture means the control distinction was missed

09 Tutor FAQ

Must students memorise 730 hectares and 2,400 farms?

Only the magnitudes: about 700 hectares and about 2,400 farms. The point is the derived conclusion that an average farm is about 0.3 hectares, not the raw figures.

Why are leafy vegetables dominant?

They have a short shelf life and high transport loss, so local same-day freshness is an advantage, while rice and root crops store well and are cheaper to import.

Does low self-sufficiency mean farming has no value?

No. Beyond quantity, local farming provides fresh leafy vegetables, a buffer during typhoons or border disruption, a land reserve and rural ecology.

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A TutorZone lesson-prep guide. Written by the TutorZone team; questions and lesson flow are original and are not taken from any school or publisher material.