Intercrops have many agroecological advantages compared to monoculture. They have different interactions, that can have positive or negative influence on their effeciency. In our work we have overlooked, what intercrops are and how do they influence N in soil. The most important property was effeciency of N usage in intercrops. In researches legumens are often used as N source. Their usage is more effecient especially when farming is more extensive and fertilisation lower than optimum. Cruciferus vegetables are also often used, as they are great users of N, but due to bad effeciency, quantity of N is always excesive. We can fix that with intercrops that use the remainder of N. Those plants are not always vegetables as this plants can be used as cover crops in the winter, and in spring their mulch is used as fertiliser. Effeciency is measured by LER or land equivalent ratio. This index compares monocrop and intercrop and is the most important piece of information in most of the articles. Economical view is also important, as not only land usage is better, sometimes slight reduction in fertilisation can lead to comparable results, especially on small farms one crop can cover for lack of the other one in case of a bad year. Main argument of intercropping is stil benefit to the environment, as better use of N is not only economical advantage. Less N in soil means less leeching. Even though there are many advantages, this field remains still fairlly unexplored, so it is neccesary to make research before putting two crops together, as dissadvantages can prevail.
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