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Teaching case of "space seed" planting activity in labor and technology education "
2022-05-07 16:19:32【Popular science China】
One 、 Teaching background ：
Our Chuncheng middle school won the National Youth Aerospace Science Popularization excellent activity base last year , Ningxiang Labor Education Experimental School . The school has built an on campus and off campus base and Beidou science popularization corridor . In order to make students feel space technology closely , Cultivate students to love science , The positive emotion of loving labor ,4 month 12 The morning of , In the school planting base , Carry out space seed planting activities .
Two 、 Teaching objectives
1、 space flight Labor theme characteristic practice activities , Spread space science knowledge , Concept and practice of labor education .
2、 Moving target 、 idea 、 Content 、 organization 、 Meet the evaluation of 《 The guiding outline of comprehensive practical activities in primary and secondary schools 》 And 《 Guidelines for labor education in primary and secondary schools （ On a trial basis ）》 requirement .
3、 Learn planting techniques , Learn to use basic labor tools .
4、 Grow and grow , Grow beans and beans , A grain of millet is planted in spring , Harvest ten thousand seeds in autumn . Experience the joy of harvest , The joy of success .
Set up great ideals ： Plant... On earth today ,（ When I grew up ） On the ship tomorrow 、 Lunar base 、 Mars base opens up farms to grow vegetables . Let students through labor , Contact 、 Understand space breeding methods , Cultivate students' interest in Aerospace Science and Technology , Explore the mysteries of the universe and life . meanwhile , In the process of experiencing labor , Master labor skills , Understand the growth law of crops , Both participated in social practice , And cultivated the good habit of scientific interest and love of labor , Understand the truth that labor creates a better life for mankind .
3、 ... and 、 Teaching methods ：
Combine theory with practice , Labor experience , Planting experiment .
Four 、 Participants ： Labor Technology Science Association students 、 Biology teacher 、 Labor skill teacher, etc .
5、 ... and 、 The teaching process
1、 Theory learning
What is space seed ？
“ Space seeds ” Is to carry ordinary vegetable seeds on space satellites , Weightlessness through space 、 Hypoxia, etc
Special environmental changes , The internal structure has changed dramatically , After returning to the ground , Cultivated by agricultural experts for many years . at present
Only a few countries in the world can cultivate space vegetable seeds .
First step ： First generation seed observation . Those who carry spacecraft back to the ground are called the first generation
seeds , All planted , Observation record .
The second step ： The second generation seed is preferred . The seeds harvested in the first generation are planted again , sprout
The seed of is called the second generation seed . Variation makes random , Screening according to breeding objectives .
The third step ： Observation on the stability of the third generation seeds . Check whether the mutant character can be stable
Set the genetic .
Step four ： Group comparison and remote trial . Make sure you can perform in different environments
Good traits .
① nutrition ： The vitamin content of space vegetables is higher than that of ordinary vegetables 2 More than times , Trace amounts beneficial to human body
Elements such as iron 、 zinc 、 copper 、 phosphorus 、 manganese 、 Carotene, etc .
② texture ： More delicious than ordinary vegetables , For example, space sweet pepper can be eaten raw , The taste is slightly sweet , clear
Crisp and refreshing .
③ vitality ： stronger , If different seeds reflect drought resistance 、 Different characteristics such as insect resistance .
The space seeds provided by this activity are the first generation hybrids carried by spacecraft , Breeding base of United Aerospace Group
for , The purity 95%, Cleanliness 99%, The germination rate exceeds 85%, quality guarantee period 12 Months .
The organizing committee can provide supporting materials for seed carrying spacecraft and sign an agreement to ensure your legitimate rights and interests , section
stop 2022 In, this activity has been successfully organized for six times . The space seed and planting Manual of our university is provided and guided by the school of future science and technology of the University of Chinese Academy of Sciences .
2、 Know space seeds
3、 breeding 、 Seed preservation is a national strategy , So seeds are very important to a country's agricultural economy .
6、 ... and 、 Planting experience inquiry process
Before planting , Deng yunfen, a biology teacher in the school community, demonstrated and taught the students how to soak seeds 、 germination 、 Plant , And remind everyone of planting precautions . Problem design ：( Answer quickly , If you answer correctly, you will be rewarded )
1、 What are the necessary conditions for seed germination ？
2、 How long do you usually soak seeds in water ？
3、 What is the appropriate water temperature for soaking seeds ？
4、 Will the fried and boiled seeds germinate ？
5、 Seeds have a life span ？
6、 Does the seed breathe ？
7、 What's the matter with insect seeds ？
8、 What are the nutritional elements of plants ？
9、 What does the root of a plant do ?
10、 What's the matter with seedless melons ?
In the Tutor Liu Zhangping 、 Deng yunfen 、 Xiong Sufeng 、 Under the guidance of Zhu suming and others , The children planted the seeds as required , And carefully label . Plant precious seeds by yourself , Happy and excited , Expect them to germinate 、 take root 、 Long seedlings grow up 、 Bloom 、 result ……“ This is the first time we have planted ‘ Space seeds ’, The students are excited and nervous now , I'm excited to be able to sow with my own hands , The nervous thing is that I'm afraid of something bad .” The students in the club chirped and yelled ：“ I think it can produce super hot peppers ！”“ Maybe it's all kinds of shapes ！”…… One by one “ special ” What happens when the seed of meets a group of working children ？ Let's wait and see ！
7、 ... and 、 Understand fertilizer and correct fertilization methods ;
Three elements of fertilizer ：
1. nitrogen ： It is the main component of protein and chlorophyll in the body . When nitrogen is sufficient , Lush branches and leaves, thick green , Strong photosynthesis , Making organic matter is more , The body grows , Tiller fast , The ears and grains are full , High output . In the absence of nitrogen , The crop plants are short and weak , Yellow leaves grow slowly , Low output , When there is too much nitrogen , It will also cause the crazy growth of crops , It's easy to be young and mature late , Prone to lodging , Reduce the impact on drought 、 Resistance to cold and pests .
2. phosphorus ： Phosphorus is abundant in seeds , It is the main component of plant nucleus . Phosphorus can promote plant germination 、 Long roots 、 m. 、 Strong and mature . When crops lack phosphorus , Plant stems and leaves are often purple 、 Reddish brown or unusually grayish green , Late flowering 、 Strong and small .
3. potassium ： Potassium can increase the intensity of photosynthesis . Normal metabolism , Enhance cold resistance , Promote the stem to be strong , Enhance the ability to resist lodging and disease . When potassium is deficient, the plant is thin 、 m. 、 Few tillers , The leaves dried up from the old leaves 、 Fall off , The output is not high .
nitrogen 、 phosphorus 、 Potassium cannot replace each other , It must be applied well . Fertilizer also improves soil water retention 、 The ability to keep fat , Adjust ph , Promote the activities of beneficial microorganisms in soil .
8、 ... and 、 Our harvest ：
The launch of this activity , Let students through labor , Contact 、 Understand space breeding methods , Cultivate students' interest in Aerospace Science and Technology , Explore the mysteries of the universe and life . meanwhile , In the process of experiencing labor , Master labor skills , Understand the growth law of crops , Both participated in social practice , And cultivated the good habit of scientific interest and love of labor , Understand the truth that labor creates a better life for mankind .
author[Popular science China],Please bring the original link to reprint, thank you.
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