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Authoritative PPT Summary
"Chemistry and Agricultural Production" Chemistry and Social Development PPT download, 28 pages in total.
learning target
1. Know the classification, names and functions of some commonly used chemical fertilizers; understand the precautions for the use of ammonium nitrogen fertilizers;
2. Know how to prepare Bordeaux mixture; have a common sense understanding of some commonly used pesticides;
3. Understand the process of crop growth and the factors that affect this process from a chemical perspective; be able to think about the effects of chemical fertilizers, pesticides, etc. on crop growth from the perspective of chemical changes.
1. Fertilizer-an important food for crops
Chemical substances that can provide nutrients to crops are called chemical fertilizers (referred to as "fertilizers").
Crop growth requires a variety of nutrients, which can be supplemented by chemical fertilizers. According to the main nutrients needed by plants, chemical fertilizers are divided into nitrogen fertilizers, phosphate fertilizers, potassium fertilizers and compound fertilizers.
Nitrogen fertilizer
Nitrogen is an important component of nucleic acids, proteins and chlorophyll in crops.
Nitrogen fertilizer can make plants have lush branches and leaves, dark green leaves, and increase yields.
2. Pesticides—guardians of crop growth
pesticide:
(1) Most of them are prepared or synthesized by chemical methods;
(2) Most of them are biological poisons;
(3) Pollute the natural environment and threaten the health of humans and animals.
Apply pesticides rationally and control the dosage, depth, and frequency of application.
Pesticide development direction: high efficiency, low residue, and less toxic to humans and animals.
Knowledge training
1. Among the following substances, which one is a compound fertilizer? ( )
A. Potassium sulfate K2SO4 B. Potassium nitrate KNO3
C. Urea CO(NH2)2 D. Calcium dihydrogen phosphate Ca(H2PO4)2
2. Compared with farm fertilizers, the advantages of chemical fertilizers are ( )
A. Full range of nutritional elements B. Fast fertilizer effect
C． Does not destroy the structure of the soil D. Long-term fertilizer effect
Keywords: free download of PPT courseware for the ninth grade of Chemistry of the May 4th System of Lujiao Edition, PPT download of Chemistry and Agricultural Production, PPT download of Chemistry and Social Development, .PPT format;
For more information about the "Chemistry and Social Development Chemistry and Agricultural Production" PPT courseware, please click the Chemistry and Social Development PPT Chemistry and Agricultural Production PPT tab.
"Chemistry and Agricultural Production" Chemistry and Social Development PPT teaching courseware:
"Chemistry and Agricultural Production" Chemistry and Social Development PPT teaching courseware, 21 pages in total. Knowledge review Knowledge point 1 Important food for chemical fertilizer crops 1. Crop growth requires a variety of nutrients, some of which come from air, water and soil, and some rely on ______..
"Chemistry and Agricultural Production" Chemistry and Social Development PPT courseware:
"Chemistry and Agricultural Production" Chemistry and Social Development PPT courseware, 25 pages in total. New Knowledge Learning Knowledge Point 1: Important Food for Chemical Fertilizer Crops 1. Classification of chemical fertilizers According to the main nutrients _________ required by plants, chemical fertilizers can be divided into ________ fertilizers, phosphate fertilizers, _..
"Chemistry and Agricultural Production" Chemistry and Social Development PPT:
"Chemistry and Agricultural Production" Chemistry and Social Development PPT, 29 pages in total. Learning objectives 1. Know the classification, names and functions of some commonly used chemical fertilizers; understand the precautions for the use of ammonium nitrogen fertilizers; 2. Know the preparation method of Bordeaux mixture; have a common sense understanding of some commonly used agricultural...