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The term spray window or application window has both a temporal and spatial meaning.

Traditionally, in biological and chemical plant protection, the spray window is the application period which, from a biological, ecological or climatic point of view, allows the desired effect to be expected without undesirable side effects and which is legally permissible. Some pesticide manufacturers offer daily updated calculation models for the spray window , i.e. the time-optimized application of their products.

Since the 1960s, progressive farmers at the edge of the field have exempted a small area from fertilization and plant protection measures in order to check the effectiveness of the respective measure in their own small-scale tests and to be able to explain their necessity to interested people. As far as plant protection is concerned, the term spray window is also used here.

Since the 1990s, in large-scale crop cultivation trials, demarcated areas without treatment, as well as with different application methods and application times as well as products have been referred to as spray windows. The aim is to make the biological, ecological and economic benefits of plant protection in agricultural practice visible and measurable (see also the TU Braunschweig web link).

Fertilizer windows have been in agricultural practice since the 1980s. They are related to the EU directives on environmental protection and use of fertilizers in crop production . Limiting the amount of fertilizer used can lead to deficiency symptoms in the plants and thus to yield losses. In order to limit this risk, for example, in cereal crops on an easily accessible section of 30 to 40 m², the fertilizer application is reduced by 10–20%. If deficiency symptoms are found in the plants in this fertilization window during regular inspections, the necessary addition of nutrients is carried out over the entire field before a nutrient deficiency with the risk of reduced yields also occurs there (see KTBL suggestions ).

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