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Teaching case of "space seed" planting activity in labor and technology education "

2022-05-07 16:19:32Popular 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 .

Activity professionalism

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 .

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