Land area calculation

Knowledge Title: Land area calculation Other Title: land area measurement Knowledge Content:  The work of measuring and calculating various types of land area on the land use status map. Accurate land area is the basis of land management, land planning, preparation of national economic planning, engineering construction planning, and also the basis for strengthening cadastral work and reasonable collection of land tax.  The land area volume should be calculated on the newly prepared land use status map, and according to the principle of map control, scale calculation, level-by-level difference. Its procedures are: (1) to map as the basic control, according to the need to draw out a number of sub-districts, such as in the county-level units below, can be based on the boundaries of the township or village under the jurisdiction of the area as a partition, the calculation of the area of land area of each district, with the plot theoretical area (i.……

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DeBari, H.A.

Knowledge Title: DeBari, H.A. Other Title: Heinrich Anton de Bary (1831-1888) Knowledge Content:  German botanist. Born in Frankfurt, Germany, on 26 January 1831, he died in Strasbourg, France, on 19 January 1888. After receiving his Ph.D. in Medicine in 1853, he worked as a surgeon in Frankfurt. He was a professor of botany at Freiburg from 1855 to 1866, professor of botany at the University of Harley in Germany from 1867 to 1872, and president of the University of Strasbourg, France, from 1872 to 1888.  DeBarry was the founder of modern mycology and plant pathology. In 1853, at the age of 22, he published a monograph, The Study of Black Powder Bacteria. The life history of many fungal species was carefully observed and studied, and the first study of parasitic, symbiotic and rot phenomena, as well as plant epidemic diseases, especially potato late disease and wheat rust.……

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Land governance

Knowledge Title: Land governance Other Title: land reclamation Knowledge Content:  Apply engineering measures and biological measures to improve the bad nature of land, improve land utilization rate and productivity, in order to facilitate the intensive management process. The integrity of land determines the comprehensiveness of land management measures. The main points include: (1) the governance of the various elements of land resources as a whole. The elements of land resources are interrelated and mutually restricted, so they are required to coordinate with each other in order to maintain ecological balance. (2) The utilization and transformation of land resources as a whole process. Different governance measures are taken according to different purposes and methods of utilization. (3) Combine biological and engineering measures into a whole. Biological measures require engineering measures, and engineering measures require biological measures to protect.  The contents of land governance mainly include:……

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Tropical fish

Knowledge Title: Tropical fish Other Title: tropical fish Knowledge Content:  Generally refers to some ornamental fish native to tropical, subtropical and some temperate areas.  Tropical fish native to the Americas, Africa and southeastern Asia, its culture originated in Europe. In 1868, a French consul in China first brought fighting fish from southern China to Paris for breeding, and since then tropical fish has been reared and bred in Europe. Tropical fish became popular all over the world at the end of the 19th century as ornamental fish. China's Guangzhou and Shanghai began breeding tropical fish in the 1920s and has since spread to all parts of the country. At present, China mainly keeps freshwater tropical fish, but coastal areas and aquariums also have a small number of marine tropical fish.  Kinds of tropical fish small, lively, strange shape, a variety of forms, beautiful body color, species are also very many.……

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Sycamore

Knowledge Title: Sycamore Other Title: Platanus acerifolia Knowledge Content:  Platanaceae suspended Suzuki is a large deciduous tree. Another British dragonfly, two ball hanging Suzuki. This genus is about 6 to 7 species, the fruit spherical, drooping as a bell, so name. First discovered in Oxford, England around 1670, The Suspended Suzuki is a natural hybrid of Meiji (single-ball suspended Suzuki, P.occidentalis) and Fayu (three-ball dangling Suzuki, P.orientalis). Because of its large shade, strong resistance, can adapt to the bad conditions of urban streets, is the ideal road tree and shade tree, soon in Europe and the United States to get widespread cultivation. In Japan is also known as the “King of the Street Tree”. It was introduced to Shanghai, China at the end of the 19th century. At that time in Shanghai, the “French concession” planted more, leaf-like, and therefore often mistakenly referred to as “French dragonfly.……

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History of millet cultivation in China

Knowledge Title: History of millet cultivation in China Other Title: history of foxtail millet cultivation in China Knowledge Content:  Ancient lying, valley, or grain, its son is actually called millet. In northern China, where the source of the millet is the center of the plant, its wild breed of dogtails (Setaria viridis) is widely distributed in China. From the west of Gansu Yumen, east to Shandong Longshan Neolithic ruins, there are nearly 20 carbonized millet unearthed (see color map), the earliest of which is about 7000 years ago in Henan Ligang and Hebei magnetic mountain sites, indicating that the Yellow River basin millet has a long history of domestication and cultivation. The early culture of the Yellow River basin can also be said to be the millet and slug culture of dry farming. The words “Sic”, “Twisted” and “Twisted”, “Twisted”, “Twisted” and “Twisted” appeared in the Book of Poems.……

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Bent Bacillus disease

Knowledge Title: Bent Bacillus disease Other Title: campylobacteriosis Knowledge Content:  Reproductive tract and intestinal infectious diseases of livestock and poultry caused by Campylobacter. Bent bacillus, formerly known as Vibrio, is now a new genus, namely Curved Bacteria. Among them, Campylobacterfelus, or Vibrio bactus, is the original cause of miscarriage and infertility in cattle and sheep.  There are 3 subspecies of fetal bent bacteria, whose name and cause of disease are mainly: (1) stemoto foetal phretis (C.b. venerealis). Abortion and infertility in cattle are found in the reproductive tract of cattle and in the placenta and fetal tissue of abortion, but cannot reproduce in the intestines of animals and humans. Infection by mating or artificial insemination. Bulls often carry bacteria without disease or lesions. Cows can lead to infertility if they become infected during childbearing or non-pregnancy. The fetal membrane is often left in the womb when the cow is more than 5 months pregnant.……

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Li

Knowledge Title: Li Other Title: Prunus salicin Knowledge Content:  Rosaceae Is a deciduous little tree. Native to China, has more than 2500 years of cultivation history. China has been planted from Guangdong to Heilongjiang in the south of China, and has been introduced in Japan, India, the United States and the Soviet Union. The crown of the tree is wide of the sphere. Leaf long round or inverted shape. Flowers are usually 3 flowers and are born in one, with white petals. A spherical of nuclear fruit, yellow, red, green, or purple; Most varieties are not strong. According to the peel color can be divided into yellow to orange red, green to yellow-green, red to sebum red and red-purple 4 groups. Li tree grows rapidly, enters the early stage of the results, high yield, is not strict on the soil requirements, suitable for strong water conservation on the more sticky soil growth.……

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Medium tillage

Knowledge Title: Medium tillage Other Title: intertillage Knowledge Content:  Topsoil farming carried out between plants during crop fertility. The operating tools are hand-picked, medium plough, tooth-picking and a variety of tillers. Medium tillage can loosen topsoil, break slabs, increase soil ventilation, improve soil temperature, promote good gas microbial activity in soil and effective soil nutrients, remove weeds, promote plant root extension, is also an important means to regulate soil moisture condition. In the dry soil, the tillage can cut off the fine tube of the topsoil and reduce the evaporation of water, while in the soil is too wet, tillage is conducive to evaporation of excess water due to the soil loose. The middle tillage of rice paddies, also known as rice, can also increase the oxygen content of the soil by loosening the soil, improve the oxidation potential of the soil, discharge harmful gases, and promote the distribution of rice.……

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Seed Library

Knowledge Title: Seed Library Other Title: seed storage Knowledge Content:  A warehouse for storing crop seeds. Seeds are the means of production for planting crops in the next season, and during storage, they should not only ensure their invariant, no mold, no loss, no doping, but also the inherent vitality of the seeds. The types of warehouses are house-type silos, brick arch silos, earthy silos and mechanized silos (see silos), suitable for storing seeds such as rice, wheat, corn, soybeans, peanuts and cotton; With the development of agricultural production and the improvement of storage technology, seed bank gradually develops towards specialization and diversification of warehouse type.  Site selection Seed library should choose in the center of the crop production area and convenient location, adjacent to the seed breeding, production and processing base, the service radius should not be too large.……

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