Increase production

Exploring Measures to Improve Crop Yield

The last lesson of photosynthesis was conducted in this lesson on the theme of improving crop yield. Explain from three aspects:

I. Increasing the Content of Organic Matter in Plants

1. Increasing the amount of organic compounds synthesized

A. Increasing illumination intensity appropriately and prolonging illumination time;

B. Increase CO2 concentration appropriately;

C. Increasing temperature appropriately;

D. Increase the water content of plants appropriately (water is the raw material of photosynthesis; it is the medium of various chemical reactions in vivo; water affects the switch of stomata, and indirectly affects the entry of CO2 into plants)

E. Increase the content of mineral elements appropriately.

2. Reducing the Consumption of Organic Matter

A. Appropriate temperature reduction; B. Reducing the concentration of O2; C. Increasing the concentration of CO2; D. Reducing the content of free water, etc.

In this passage, the students have several questions:

Increasing CO2 concentration not only increases the synthesis of organic compounds, but also reduces the consumption of organic compounds. How to operate?

Reducing the content of free water can reduce the consumption of organic matter. How to operate?

2. How to increase the yield of greenhouse cultivation?

1. Light regulation: in winter or rainy days, artificial light can be used; in summer, shelter;

2. Regulation of CO 2: Combustion method can increase the intensity of photosynthesis and inhibit respiration.

3. Humidity regulation: when the humidity is too high (affecting the absorption or loss of water by plants; causing the growth of microorganisms causing plant diseases). Ventilation or elevated temperature can be used to reduce humidity. If the humidity is too high, spray spray can be adopted.

4. Temperature control: Cover the plastic film with straw curtain. Depending on the temperature, cover or roll.

5. Water and fertilizer. The application of organic fertilizer, microbial decomposition, increase the concentration of CO2 in the environment, while combing the soil.

Reminder: Greenhouse cultivation should prevent "white pollution". The method adopted is to use degradable plastic film.

Third, how to improve the yield of the field?

1. Light regulation:

Reasonable close planting: If the plant is too dense, the reasons for crop yield reduction are: first, insufficient light received by leaves; second, poor ventilation and insufficient supply of CO2;

B. Rotation, interplanting and intercropping: Rotation refers to the rotation of several crops in a field, such as wheat and potato; Intercropping refers to the later stage of the growth of one crop, planting another crop in the row, in order to make full use of the soil fertility and growth period, such as cotton and wheat. Intercropping refers to the cultivation of two or more crops, such as cotton and cantaloupe, in an interval on the same cultivated land during the same growth period.

2. Regulation of CO 2: Rational fertilization such as farm manure;

3. Temperature regulation: timely sowing;

4. Water regulation: rational irrigation.

4. Advantages and disadvantages of farmland loosening:

Benefit: Increase the permeability of soil, promote the decomposition of litter, animal remains and feces by microorganisms in soil, and benefit the growth of crops.

Disadvantages: 1. It is easy to cause soil erosion and may become a triggering factor of dust storms.

2. It promotes the aerobic respiration of microorganisms and increases the emission of CO 2, which makes the greenhouse effect and global warming serious.

3. Increase the cost of agricultural production.

Promote no-tillage:

It means that the measures of loosening soil are not used or used as little as possible in agricultural production. When harvesting, only wheat ears or rice ears are harvested, while the treated straw and stubble are kept on the surface of the farmland and allowed to rot, so as to restore the natural state of the soil as far as possible, protect the soil and avoid water evaporation. For agricultural pests and weeds, pesticides and herbicides are used to solve the problem.

No-tillage is beneficial to soil and water conservation, can reduce the occurrence of dust storms, and can improve soil fertility.