Posts - Sown fields


History of Tobacco Nicotiana tabacum L. Plant

The history of tobacco plant Nicotiana tabacum L. is a great chapter in the world agriculture history. Even more so, it is also an important chapter in the history of the human race, because the generalization of tobacco cultivation.

The Organophosphate Pesticides in Agriculture

The Organophosphate Pesticides compose a large group of plant protection products with - mainly - insecticidal and acaricidal activity. These include some, whose active substances are among the most toxic have been used in the past and/or used up to date.

The Horticultural Use of Zeolite

The interest in the horticultural use of Zeolite in recent years is particularly high. And this is justified by the growing interest in exploiting the kind of natural resources that contribute to the increase of agricultural production with the lowest possible environmental costs

Manifesto – Nicanor Parra

The poem entitled Manifesto, is entirely given here - a poem written by the outstanding Chilean poet Nicanor Parra and was published in 1963, in Número journal, Uruguay. In 1969 it was included in the poetry collection Obra Gruesa, which was released by Editorial Universitaria publishing house of Chile.

Apple Powdery Mildew (Podosphaera leucotricha)

The Apple Powdery Mildew, which is caused by the ascomycete fungus Podosphaera leucotricha, represents an important disease of the tree and crop. But despite the name, it is not only one of the most serious diseases of Apple tree.

Genus Cedrus (Cedrus Trew): Classification, Description & Uses

The genus Cedrus, the so-called genus of True Cedars, truly is not characterized by the great number of its species. On the contrary, in the best case, it includes four species, in the worst just three, two or one. However, what loses in massiveness replenishes it in utility and beauty.


The use of the material, where third-party rights are not mentioned, is completely free. Its sharing, possibly, useful.


The cultivated species is called Sisal and is Agave sisalana (Agave sisalana), a textile plant of the tropical and subtropical regions. Brazil is the largest producer country in world.


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